Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

[Robert Hancock]

Dushan Tcholich wrote:
> Hello
> 
> This is my first bugreport on LKML so please be patient :)
> 
> top always shows me that ksoftirqd usualy gets around 8%CPU, it
> changes between 6 and 10%.
> It's sometimes ksoftirqd/0 sometimes /1, differs on the reboot but
> doesn't change during work.
> I noticed it because it had very high time+, 500hours or so.
> I reproduced these problems with kernels 2.6.24 .25 and .27-rc1-mm1. I
> don't remember that this happened during .22 and .23 kernels, but I
> can check again if it's necessary.
> Timer freq is 1000Hz
> 
> What I tried without changes with help from ##kernel:
> 1. built kernel without kvm;
> 2. disconnected all usb hw except mouse;
> 3. run glxgears which consumed 98% CPU and ksoftirqd  2%;
> 4. Tried to stress disk subsystem by copying a lot of small files on
> the same partition:
> time cp -R /usr/portage/* /tmp/1
> real 2m17.530s
> user 0m0.764s
> sys 0m18.596s
> 
> it was 127507 items 1.5GB, but just pdflush jumped to 14% from time to time;
> 5. disabled serial port in BIOS because my UPS was connected to it,
> and I suspected that it was maybe polling too much;
> 6. disconnected eth cable
> 7. tried googling but all I found is that some people had similar
> problem. Some TV cards were the culprit but I don't have that HW.
> 
> If you need any more data please cc me as I'm not subscribed

It would be useful to try running oprofile on an otherwise idle system 
and see where it reports the CPU time is being used..

Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

[Dushan Tcholich]

Hello

On Mon, Aug 4, 2008 at 9:43 PM, Robert Hancock <hancockr@shaw.ca> wrote:
> Dushan Tcholich wrote:
>>
>> Hello
>>
>> This is my first bugreport on LKML so please be patient :)
>>
>> top always shows me that ksoftirqd usualy gets around 8%CPU, it
>> changes between 6 and 10%.
>> It's sometimes ksoftirqd/0 sometimes /1, differs on the reboot but
>> doesn't change during work.
>> I noticed it because it had very high time+, 500hours or so.
>> I reproduced these problems with kernels 2.6.24 .25 and .27-rc1-mm1. I
>> don't remember that this happened during .22 and .23 kernels, but I
>> can check again if it's necessary.
>> Timer freq is 1000Hz
>>
>> What I tried without changes with help from ##kernel:
>> 1. built kernel without kvm;
>> 2. disconnected all usb hw except mouse;
>> 3. run glxgears which consumed 98% CPU and ksoftirqd  2%;
>> 4. Tried to stress disk subsystem by copying a lot of small files on
>> the same partition:
>> time cp -R /usr/portage/* /tmp/1
>> real 2m17.530s
>> user 0m0.764s
>> sys 0m18.596s
>>
>> it was 127507 items 1.5GB, but just pdflush jumped to 14% from time to
>> time;
>> 5. disabled serial port in BIOS because my UPS was connected to it,
>> and I suspected that it was maybe polling too much;
>> 6. disconnected eth cable
>> 7. tried googling but all I found is that some people had similar
>> problem. Some TV cards were the culprit but I don't have that HW.
>>
>> If you need any more data please cc me as I'm not subscribed
>
> It would be useful to try running oprofile on an otherwise idle system and
> see where it reports the CPU time is being used..
>
I googled a little and found out that oprofile is a little above my head.
So as I thought that some driver or HW might be responsible for this I
tried to disable various onboard HW and found out that if I disable
onboard ethernet problem dissapears, so now I've added netdev and
maintainer of R8169 driver to cc.

Thanks
Dushan

Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

[Dushan Tcholich]

Hello again


On Mon, Aug 11, 2008 at 9:53 AM, Dushan Tcholich <dusanc@gmail.com> wrote:
> Hi
>
> On Sun, Aug 10, 2008 at 9:00 PM, Dushan Tcholich <dusanc@gmail.com> wrote:
>> Hi
>> Sorry for answering this late, but I was short on time and couldn't
>> get reiser4 to work with 2.6.27-rc2
>>
>> On Thu, Aug 7, 2008 at 8:58 PM, Francois Romieu <romieu@fr.zoreil.com> wrote:
>>> Dushan Tcholich <dusanc@gmail.com> :
>>> [...]
>>>> I googled a little and found out that oprofile is a little above my head.
>>>> So as I thought that some driver or HW might be responsible for this I
>>>> tried to disable various onboard HW and found out that if I disable
>>>> onboard ethernet problem dissapears, so now I've added netdev and
>>>> maintainer of R8169 driver to cc.
>>>
>>> Can you try 2.6.27-rc2 and send the content of /proc/interrupts, dmesg,
>>> ifconfig as well as a capture of the strange output from top ?
>>>
>
> I tried some more kernels and I had the same problem with 2.6.23.17
> and 2.6.27-rc1-mm1, but I couldn't reproduce it with kernel from
> sysresccd 1.0.1 http://www.sysresccd.org/ which is a patched version
> of 2.6.24 i think .7 when I booted it to change fs.
> Could it be that something in userspace is creating this?
>

I dug a little more and found out some new info.
Unsolved bugreport with same symptoms:
http://marc.info/?l=linux-kernel&m=119613299024398&w=2
Problems appear if I start br0 interface, as context switch rate
increases 200 times. If I start eth0 instead everything looks ok.
The bugreport above had bridging enabled too.

When using eth0 I get:
 vmstat -n 1 10
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 2  0  17720 162288  25024 576852    0    0    21    22    6    9 10  4 85  0
 0  0  17720 162196  25024 576880    0    0     0     0   13  473  0  0 99  0
 0  0  17720 162196  25028 576880    0    0     0     4   36 1122  1  0 99  0
 0  0  17720 162196  25028 576880    0    0     0     0   83  844  0  0 99  0
 0  0  17720 162196  25028 576880    0    0     0     0   55  691  1  0 99  0
 0  0  17720 162556  25028 576880    0    0     0     0   13  490  1  0 100  0
 0  0  17720 162100  25028 576880    0    0     0     0   39  561  6  0 94  0
 1  0  17720 162028  25028 576880    0    0     0     0   16 1030  4  0 96  0
 0  0  17720 162028  25028 576880    0    0     0     0   40  597  1  0 99  0
 0  0  17720 162028  25028 576880    0    0     0     0   12  512  2  0 97  0

 top

top - 03:30:07 up 6 days,  5:40,  4 users,  load average: 0.02, 0.11, 0.28
Tasks: 149 total,   2 running, 147 sleeping,   0 stopped,   0 zombie
Cpu(s): 12.1%us,  3.3%sy,  0.0%ni, 84.6%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   1033388k total,   871336k used,   162052k free,    25016k buffers
Swap:   610460k total,    17720k used,   592740k free,   576852k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND

    4 root      15  -5     0    0    0 S    0  0.0 554:23.44 ksoftirqd/0

If I use br0 I get:
 vmstat -n 1 10
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0  17720 162112  25048 577120    0    0    21    22    6   11 10  4 86  0
 0  0  17720 162152  25048 577120    0    0     0     0   14 111082  0  3 97  0
 0  0  17720 162152  25048 577120    0    0     0     0   23 107134  1  3 96  0
 1  0  17720 160148  25048 577120    0    0     0     0   11 109888  2  3 95  0
 0  0  17720 162032  25048 577120    0    0     0     0   33 108163  1  2 97  0
 0  0  17720 162032  25048 577120    0    0     0     0    7 104642  2  2 95  0
 0  0  17720 162020  25048 577120    0    0     0     0   41 109135  0  2 98  0
 0  0  17720 162036  25048 577120    0    0     0     0    9 105133  0  3 96  0
 0  0  17720 162020  25048 577120    0    0     0     0   42 107605  1  2 97  0
 1  0  17720 162032  25048 577120    0    0     0     0    5 110768  0  2 98  0

top

top - 03:32:03 up 6 days,  5:41,  4 users,  load average: 0.09, 0.10, 0.26
Tasks: 148 total,   2 running, 146 sleeping,   0 stopped,   0 zombie
Cpu(s):  4.8%us,  2.0%sy,  0.0%ni, 93.0%id,  0.0%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:   1033388k total,   871564k used,   161824k free,    25048k buffers
Swap:   610460k total,    17720k used,   592740k free,   577120k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
11489 dusan     20   0  235m  85m  24m R    6  8.5   1:03.51 firefox
    4 root      15  -5     0    0    0 S   7  0.0 554:24.04 ksoftirqd/0

I start br0 like this in /etc/conf.d/net

bridge_br0="eth0"
config_eth0=( "null" )
config_br0=( "192.168.1.3/24" )
RC_NEED_br0="net.eth0"
brctl_br0=( "setfd 0" "sethello 0" "stp off" )
#routes_br0=( "default gw 192.168.1.3" )
depend_br0() {
        need net.eth0
}

I start eth0 like this in /etc/conf.d/net
config_eth0=( "192.168.1.3/24" )

>> I've copied my root to ext3 partition and with vanilla 2.6.27-rc2 I got:
>> -With my .config problem is still here
>> -With only rtl8169 removed from config there is no problem
>>
>>> It seems rather benign though.
>>>
>> Well I wouldn't agree from power managment standpoint :). This nic is
>> in a lot of laptops.
>> 8% of 2.13GHz Core2Duo CPU is a lot :)
>>
>> Btw. should LKML be removed from cc?
>> If you need any more help please ask.
>> I hope I'm not harrasing you too much :)
>>> --
>>> Ueimor
>>>
>> Have a nice day
>> Dushan
>>
> ...
>
Have a nice day
Dushan

Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

[Dushan Tcholich]

Hello
I found the culprit.

When using powertop I get:
Top causes for wakeups:
  35,2% (251,0)                ip : br_stp_enable_bridge (br_hello_timer_expired

So I tried to turn them off with:
brctl sethello br0 0
but the problem persisted.
If I do
brctl sethello br0 5
context switch rate drops 200 times and problem is gone.
I think that the command brctl sethello br0 0 doesn't turn off hello
messages, but sends them 250 times per second.

Thanks for your time
Dushan
On Sat, Aug 30, 2008 at 3:48 AM, Dushan Tcholich <dusanc@gmail.com> wrote:
> Hello again
>
>
> On Mon, Aug 11, 2008 at 9:53 AM, Dushan Tcholich <dusanc@gmail.com> wrote:
>> Hi
>>
>> On Sun, Aug 10, 2008 at 9:00 PM, Dushan Tcholich <dusanc@gmail.com> wrote:
>>> Hi
>>> Sorry for answering this late, but I was short on time and couldn't
>>> get reiser4 to work with 2.6.27-rc2
>>>
>>> On Thu, Aug 7, 2008 at 8:58 PM, Francois Romieu <romieu@fr.zoreil.com> wrote:
>>>> Dushan Tcholich <dusanc@gmail.com> :
>>>> [...]
>>>>> I googled a little and found out that oprofile is a little above my head.
>>>>> So as I thought that some driver or HW might be responsible for this I
>>>>> tried to disable various onboard HW and found out that if I disable
>>>>> onboard ethernet problem dissapears, so now I've added netdev and
>>>>> maintainer of R8169 driver to cc.
>>>>
>>>> Can you try 2.6.27-rc2 and send the content of /proc/interrupts, dmesg,
>>>> ifconfig as well as a capture of the strange output from top ?
>>>>
>>
>> I tried some more kernels and I had the same problem with 2.6.23.17
>> and 2.6.27-rc1-mm1, but I couldn't reproduce it with kernel from
>> sysresccd 1.0.1 http://www.sysresccd.org/ which is a patched version
>> of 2.6.24 i think .7 when I booted it to change fs.
>> Could it be that something in userspace is creating this?
>>
>
> I dug a little more and found out some new info.
> Unsolved bugreport with same symptoms:
> http://marc.info/?l=linux-kernel&m=119613299024398&w=2
> Problems appear if I start br0 interface, as context switch rate
> increases 200 times. If I start eth0 instead everything looks ok.
> The bugreport above had bridging enabled too.
>
> When using eth0 I get:
>  vmstat -n 1 10
> procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
>  r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
>  2  0  17720 162288  25024 576852    0    0    21    22    6    9 10  4 85  0
>  0  0  17720 162196  25024 576880    0    0     0     0   13  473  0  0 99  0
>  0  0  17720 162196  25028 576880    0    0     0     4   36 1122  1  0 99  0
>  0  0  17720 162196  25028 576880    0    0     0     0   83  844  0  0 99  0
>  0  0  17720 162196  25028 576880    0    0     0     0   55  691  1  0 99  0
>  0  0  17720 162556  25028 576880    0    0     0     0   13  490  1  0 100  0
>  0  0  17720 162100  25028 576880    0    0     0     0   39  561  6  0 94  0
>  1  0  17720 162028  25028 576880    0    0     0     0   16 1030  4  0 96  0
>  0  0  17720 162028  25028 576880    0    0     0     0   40  597  1  0 99  0
>  0  0  17720 162028  25028 576880    0    0     0     0   12  512  2  0 97  0
>
>  top
>
> top - 03:30:07 up 6 days,  5:40,  4 users,  load average: 0.02, 0.11, 0.28
> Tasks: 149 total,   2 running, 147 sleeping,   0 stopped,   0 zombie
> Cpu(s): 12.1%us,  3.3%sy,  0.0%ni, 84.6%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
> Mem:   1033388k total,   871336k used,   162052k free,    25016k buffers
> Swap:   610460k total,    17720k used,   592740k free,   576852k cached
>
>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>
>    4 root      15  -5     0    0    0 S    0  0.0 554:23.44 ksoftirqd/0
>
> If I use br0 I get:
>  vmstat -n 1 10
> procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
>  r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
>  0  0  17720 162112  25048 577120    0    0    21    22    6   11 10  4 86  0
>  0  0  17720 162152  25048 577120    0    0     0     0   14 111082  0  3 97  0
>  0  0  17720 162152  25048 577120    0    0     0     0   23 107134  1  3 96  0
>  1  0  17720 160148  25048 577120    0    0     0     0   11 109888  2  3 95  0
>  0  0  17720 162032  25048 577120    0    0     0     0   33 108163  1  2 97  0
>  0  0  17720 162032  25048 577120    0    0     0     0    7 104642  2  2 95  0
>  0  0  17720 162020  25048 577120    0    0     0     0   41 109135  0  2 98  0
>  0  0  17720 162036  25048 577120    0    0     0     0    9 105133  0  3 96  0
>  0  0  17720 162020  25048 577120    0    0     0     0   42 107605  1  2 97  0
>  1  0  17720 162032  25048 577120    0    0     0     0    5 110768  0  2 98  0
>
> top
>
> top - 03:32:03 up 6 days,  5:41,  4 users,  load average: 0.09, 0.10, 0.26
> Tasks: 148 total,   2 running, 146 sleeping,   0 stopped,   0 zombie
> Cpu(s):  4.8%us,  2.0%sy,  0.0%ni, 93.0%id,  0.0%wa,  0.0%hi,  0.2%si,  0.0%st
> Mem:   1033388k total,   871564k used,   161824k free,    25048k buffers
> Swap:   610460k total,    17720k used,   592740k free,   577120k cached
>
>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> 11489 dusan     20   0  235m  85m  24m R    6  8.5   1:03.51 firefox
>    4 root      15  -5     0    0    0 S   7  0.0 554:24.04 ksoftirqd/0
>
> I start br0 like this in /etc/conf.d/net
>
> bridge_br0="eth0"
> config_eth0=( "null" )
> config_br0=( "192.168.1.3/24" )
> RC_NEED_br0="net.eth0"
> brctl_br0=( "setfd 0" "sethello 0" "stp off" )
> #routes_br0=( "default gw 192.168.1.3" )
> depend_br0() {
>        need net.eth0
> }
>
> I start eth0 like this in /etc/conf.d/net
> config_eth0=( "192.168.1.3/24" )
>
>>> I've copied my root to ext3 partition and with vanilla 2.6.27-rc2 I got:
>>> -With my .config problem is still here
>>> -With only rtl8169 removed from config there is no problem
>>>
>>>> It seems rather benign though.
>>>>
>>> Well I wouldn't agree from power managment standpoint :). This nic is
>>> in a lot of laptops.
>>> 8% of 2.13GHz Core2Duo CPU is a lot :)
>>>
>>> Btw. should LKML be removed from cc?
>>> If you need any more help please ask.
>>> I hope I'm not harrasing you too much :)
>>>> --
>>>> Ueimor
>>>>
>>> Have a nice day
>>> Dushan
>>>
>> ...
>>
> Have a nice day
> Dushan
>

Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

[Stephen Hemminger]

On Sun, 31 Aug 2008 10:51:46 +0200
"Dushan Tcholich" <dusanc@gmail.com> wrote:

> Hello
> I found the culprit.
> 
> When using powertop I get:
> Top causes for wakeups:
>   35,2% (251,0)                ip : br_stp_enable_bridge (br_hello_timer_expired
> 
> So I tried to turn them off with:
> brctl sethello br0 0
> but the problem persisted.


You can't turn off the hello timer, it is needed for Spanning Tree to
work. The kernel should reject requests to set hello timer < 1sec.
Most routers allow 1 - 10sec.

I am going to do a new patch to add tighter range checking for STP timer
settings and another to default fowarding delay of zero if STP is disabled.

[RFC] bridge: STP timer management range checking

[Stephen Hemminger]

The Spanning Tree Protocol timers need to be set within certain boundaries
to keep the internal protocol engine working, and to be interoperable.
This patch restricts changes to those timers to the values defined in IEEE 802.1D
specification.

The only exception to the standards are:
  * if STP is disabled allow forwarding delay to be turned off
  * allow wider range of ageing timer since this isn't directly part of
    STP, and setting it to zero allows for non-remembering bridge.

Warning: this may cause user backlash since apparently working but standards
  conforming configurations will get configuration errors that they didn't
  see before.

--- a/net/bridge/br_ioctl.c	2008-08-31 10:00:44.000000000 -0700
+++ b/net/bridge/br_ioctl.c	2008-08-31 10:34:00.000000000 -0700
@@ -177,38 +177,63 @@ static int old_dev_ioctl(struct net_devi
 	}
 
 	case BRCTL_SET_BRIDGE_FORWARD_DELAY:
+	{
+		unsigned long t = clock_t_to_jiffies(args[1]);
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;
 
+		/* enforce range checking per IEEE 802.1D 17.14 */
+		if (br->stp_enabled != BR_NO_STP &&
+		    (t < 4*HZ || t > 30 * HZ))
+			return -EINVAL;
+
 		spin_lock_bh(&br->lock);
-		br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
+		br->bridge_forward_delay = t;
 		if (br_is_root_bridge(br))
 			br->forward_delay = br->bridge_forward_delay;
 		spin_unlock_bh(&br->lock);
 		return 0;
-
+	}
 	case BRCTL_SET_BRIDGE_HELLO_TIME:
+	{
+		unsigned long t = clock_t_to_jiffies(args[1]);
+
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;
 
+		if (t < HZ || t > 15 * HZ)
+			return -EINVAL;
+
 		spin_lock_bh(&br->lock);
-		br->bridge_hello_time = clock_t_to_jiffies(args[1]);
+		br->bridge_hello_time = t;
 		if (br_is_root_bridge(br))
 			br->hello_time = br->bridge_hello_time;
 		spin_unlock_bh(&br->lock);
 		return 0;
-
+	}
 	case BRCTL_SET_BRIDGE_MAX_AGE:
+	{
+		unsigned long t = clock_t_to_jiffies(args[1]);
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;
 
+		/* enforce range checking per IEEE 802.1D 17.14 */
+		if (t < 6 * HZ || t > 40 * HZ)
+			return -EINVAL;
+
+		if (t < 2 * (br->bridge_hello_time + HZ))
+			return -EINVAL;
+
+		if (t / 2 + HZ > br->bridge_forward_delay)
+			return -EINVAL;
+
 		spin_lock_bh(&br->lock);
 		br->bridge_max_age = clock_t_to_jiffies(args[1]);
 		if (br_is_root_bridge(br))
 			br->max_age = br->bridge_max_age;
 		spin_unlock_bh(&br->lock);
 		return 0;
-
+	}
 	case BRCTL_SET_AGEING_TIME:
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;
--- a/net/bridge/br_sysfs_br.c	2008-08-31 10:23:59.000000000 -0700
+++ b/net/bridge/br_sysfs_br.c	2008-08-31 10:32:53.000000000 -0700
@@ -29,11 +29,12 @@
  */
 static ssize_t store_bridge_parm(struct device *d,
 				 const char *buf, size_t len,
-				 void (*set)(struct net_bridge *, unsigned long))
+				 int (*set)(struct net_bridge *, unsigned long))
 {
 	struct net_bridge *br = to_bridge(d);
 	char *endp;
 	unsigned long val;
+	int rc;
 
 	if (!capable(CAP_NET_ADMIN))
 		return -EPERM;
@@ -43,9 +44,10 @@ static ssize_t store_bridge_parm(struct 
 		return -EINVAL;
 
 	spin_lock_bh(&br->lock);
-	(*set)(br, val);
+	rc = (*set)(br, val);
 	spin_unlock_bh(&br->lock);
-	return len;
+
+	return rc ? rc : len;
 }
 
 
@@ -56,12 +58,19 @@ static ssize_t show_forward_delay(struct
 	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
 }
 
-static void set_forward_delay(struct net_bridge *br, unsigned long val)
+static int set_forward_delay(struct net_bridge *br, unsigned long val)
 {
 	unsigned long delay = clock_t_to_jiffies(val);
+
+	if (br->stp_enabled != BR_NO_STP &&
+	    (delay < 4*HZ || delay > 30 * HZ))
+		return -EINVAL;
+
 	br->forward_delay = delay;
 	if (br_is_root_bridge(br))
 		br->bridge_forward_delay = delay;
+
+	return 0;
 }
 
 static ssize_t store_forward_delay(struct device *d,
@@ -80,12 +89,18 @@ static ssize_t show_hello_time(struct de
 		       jiffies_to_clock_t(to_bridge(d)->hello_time));
 }
 
-static void set_hello_time(struct net_bridge *br, unsigned long val)
+static int set_hello_time(struct net_bridge *br, unsigned long val)
 {
 	unsigned long t = clock_t_to_jiffies(val);
+
+	if (t < HZ || t > 15 * HZ)
+		return -EINVAL;
+
 	br->hello_time = t;
 	if (br_is_root_bridge(br))
 		br->bridge_hello_time = t;
+
+	return 0;
 }
 
 static ssize_t store_hello_time(struct device *d,
@@ -104,12 +119,24 @@ static ssize_t show_max_age(struct devic
 		       jiffies_to_clock_t(to_bridge(d)->max_age));
 }
 
-static void set_max_age(struct net_bridge *br, unsigned long val)
+static int set_max_age(struct net_bridge *br, unsigned long val)
 {
 	unsigned long t = clock_t_to_jiffies(val);
+
+	/* enforce range checking per IEEE 802.1D 17.14 */
+	if (t < 6 * HZ || t > 40 * HZ)
+		return -EINVAL;
+
+	if (t < 2 * (br->bridge_hello_time + HZ))
+		return -EINVAL;
+
+	if (t / 2 + HZ > br->bridge_forward_delay)
+		return -EINVAL;
+
 	br->max_age = t;
 	if (br_is_root_bridge(br))
 		br->bridge_max_age = t;
+	return 0;
 }
 
 static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
@@ -126,9 +153,10 @@ static ssize_t show_ageing_time(struct d
 	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
 }
 
-static void set_ageing_time(struct net_bridge *br, unsigned long val)
+static int set_ageing_time(struct net_bridge *br, unsigned long val)
 {
 	br->ageing_time = clock_t_to_jiffies(val);
+	return 0;
 }
 
 static ssize_t store_ageing_time(struct device *d,
@@ -180,9 +208,10 @@ static ssize_t show_priority(struct devi
 		       (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
 }
 
-static void set_priority(struct net_bridge *br, unsigned long val)
+static int set_priority(struct net_bridge *br, unsigned long val)
 {
 	br_stp_set_bridge_priority(br, (u16) val);
+	return 0;
 }
 
 static ssize_t store_priority(struct device *d, struct device_attribute *attr,

Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

[Dushan Tcholich]

Hi

On Sun, Aug 31, 2008 at 7:05 PM, Stephen Hemminger
<shemminger@vyatta.com> wrote:
> On Sun, 31 Aug 2008 10:51:46 +0200
> "Dushan Tcholich" <dusanc@gmail.com> wrote:
>
>> Hello
>> I found the culprit.
>>
>> When using powertop I get:
>> Top causes for wakeups:
>>   35,2% (251,0)                ip : br_stp_enable_bridge (br_hello_timer_expired
>>
>> So I tried to turn them off with:
>> brctl sethello br0 0
>> but the problem persisted.
>
>
> You can't turn off the hello timer, it is needed for Spanning Tree to
> work. The kernel should reject requests to set hello timer < 1sec.
> Most routers allow 1 - 10sec.
>
> I am going to do a new patch to add tighter range checking for STP timer
> settings and another to default fowarding delay of zero if STP is disabled.
>
Well I try to turn stp off but it doesn't  want to :)
This is in my /etc/conf.d/net
brctl_br0=( "setfd 0" "sethello 10" "stp off" )
I had problems with sethello 0 so now I'm using 10.
Tried with
brctl stp br0 off
but still had same troubles.

Have a nice day
Dushan

Re: [RFC] bridge: STP timer management range checking

[Alan Cox]

On Sun, 31 Aug 2008 10:43:09 -0700
Stephen Hemminger <shemminger@vyatta.com> wrote:

> The Spanning Tree Protocol timers need to be set within certain boundaries
> to keep the internal protocol engine working, and to be interoperable.
> This patch restricts changes to those timers to the values defined in IEEE 802.1D
> specification.

Why do we care ? You have to be the network administrator to set values,
there are cases you may want to be out of the spec and you are
privileged. The kernel does need to stop things being done which are
fatal but running around restricting privileged administrators who have
the ability to bring the network down anyway isn't its job.

Seems bogus extra code to me - stops things working that should be
allowed too.

Re: [RFC] bridge: STP timer management range checking

[Stephen Hemminger]

Alan Cox wrote:
> On Sun, 31 Aug 2008 10:43:09 -0700
> Stephen Hemminger <shemminger@vyatta.com> wrote:
>
>   
>> The Spanning Tree Protocol timers need to be set within certain boundaries
>> to keep the internal protocol engine working, and to be interoperable.
>> This patch restricts changes to those timers to the values defined in IEEE 802.1D
>> specification.
>>     
>
> Why do we care ? You have to be the network administrator to set values,
> there are cases you may want to be out of the spec and you are
> privileged. The kernel does need to stop things being done which are
> fatal but running around restricting privileged administrators who have
> the ability to bring the network down anyway isn't its job.
>
> Seems bogus extra code to me - stops things working that should be
> allowed too.
>   
The timer configuration is propagated in network protocol, so 
misconfigured Linux box
could survive but effect other devices on the network that are less 
robust. Maybe the
small values would cause some other bridge to crash, go infinite loop, ...
More likely robust devices might ignore our packets (because values out 
of range), leading to
routing loops and other disasters.

The kernel does need to stop administrative settings from taking out a 
network. If someone
has a custom device or other non-standard usage, they can always rebuild 
the kernel and
remove the range check.

Re: [RFC] bridge: STP timer management range checking

[Valdis.Kletnieks]

[-- Attachment #1: Type: text/plain, Size: 742 bytes --]

On Sun, 31 Aug 2008 10:43:09 PDT, Stephen Hemminger said:

> Warning: this may cause user backlash since apparently working but standards
>   conforming configurations will get configuration errors that they didn't
>   see before.

Did you mean "apparently working but *non*-standards conforming"?

Other than that, seems to be a sane application of "Be conservative in what you
send".  Our network is some 30K cat-5 ports, 1100 switches, 1300 wireless
access points, and we appreciate it every time somebody makes things more
bulletproof.  And yes, we prefer things to out-and-out *fail* rather than
run in a wonky configuration - hard failures usually get fixed in a few
minutes, wonkiness can drag on for months of mystifying symptoms...


[-- Attachment #2: Type: application/pgp-signature, Size: 226 bytes --]

Re: [RFC] bridge: STP timer management range checking

[Alan Cox]

> > Seems bogus extra code to me - stops things working that should be
> > allowed too.
> >   
> The timer configuration is propagated in network protocol, so 
> misconfigured Linux box
> could survive but effect other devices on the network that are less 
> robust. Maybe the

That would be irrelevant. CAP_NET_ADMIN lets you make that size mess
anyway.

> small values would cause some other bridge to crash, go infinite loop, ...
> More likely robust devices might ignore our packets (because values out 
> of range), leading to
> routing loops and other disasters.

Spamming tree isn't secure, news at 11.

> The kernel does need to stop administrative settings from taking out a 
> network. 

If you have CAP_NET_ADMIN you can trivially take out the network unless
it is properly switched.

Now you might want your pretty little GUI and/or config tools to warn
people that their configuration is outside 802 specs but that is a
different matter altogether

Alan

Re: [RFC] bridge: STP timer management range checking

[Rick Jones]

Can one change the TCP maximum RTO to be smaller than specified in the 
specs?

rick jones

Re: [RFC] bridge: STP timer management range checking

[David Miller]

From: Rick Jones <rick.jones2@hp.com>
Date: Tue, 02 Sep 2008 09:40:46 -0700

> Can one change the TCP maximum RTO to be smaller than specified in the specs?

We always min-clamp the RTO at RTO calculation time in order to be
compatible with BSD's coarse grained times.

Re: [RFC] bridge: STP timer management range checking

[Rick Jones]

David Miller wrote:
> From: Rick Jones <rick.jones2@hp.com>
> Date: Tue, 02 Sep 2008 09:40:46 -0700
>>Can one change the TCP maximum RTO to be smaller than specified in the specs? 
> We always min-clamp the RTO at RTO calculation time in order to be
> compatible with BSD's coarse grained times.

But tuning TCP_RTO_MAX isn't permitted right?  I'm drawing (perhaps 
flawed) parallels/distinctions between what is/isn't permitted to tweak 
for timers for one protocol versus another and wondering which may be a 
case of sauce for the goose/gander.

rick jones

Re: [RFC] bridge: STP timer management range checking

[David Miller]

From: Stephen Hemminger <shemminger@vyatta.com>
Date: Sun, 31 Aug 2008 10:43:09 -0700

> The Spanning Tree Protocol timers need to be set within certain boundaries
> to keep the internal protocol engine working, and to be interoperable.
> This patch restricts changes to those timers to the values defined in IEEE 802.1D
> specification.
> 
> The only exception to the standards are:
>   * if STP is disabled allow forwarding delay to be turned off
>   * allow wider range of ageing timer since this isn't directly part of
>     STP, and setting it to zero allows for non-remembering bridge.
> 
> Warning: this may cause user backlash since apparently working but standards
>   conforming configurations will get configuration errors that they didn't
>   see before.

I don't think we can really add these kinds of restrictions wholesale
like this.

And the user is reporting that using brctl to turn off STP doesn't
appear to actually turn off STP and thus fix all of the crazy
ksoftirqd high cpu load problems.

So what we need to do is resolve the user configuration issue that is
causing this problem to begin with.

[PATCH] bridge: don't allow setting hello time to zero

[Stephen Hemminger]

The bridge hello time can't be safely set to values less than 1 second,
otherwise it is possible to end up with a runaway timer.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

--- a/net/bridge/br_ioctl.c	2008-09-04 15:25:41.000000000 -0700
+++ b/net/bridge/br_ioctl.c	2008-09-04 15:44:33.000000000 -0700
@@ -188,15 +188,21 @@ static int old_dev_ioctl(struct net_devi
 		return 0;
 
 	case BRCTL_SET_BRIDGE_HELLO_TIME:
+	{
+		unsigned long t = clock_t_to_jiffies(args[1]);
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;
 
+		if (t < HZ)
+			return -EINVAL;
+
 		spin_lock_bh(&br->lock);
-		br->bridge_hello_time = clock_t_to_jiffies(args[1]);
+		br->bridge_hello_time = t;
 		if (br_is_root_bridge(br))
 			br->hello_time = br->bridge_hello_time;
 		spin_unlock_bh(&br->lock);
 		return 0;
+	}
 
 	case BRCTL_SET_BRIDGE_MAX_AGE:
 		if (!capable(CAP_NET_ADMIN))
--- a/net/bridge/br_sysfs_br.c	2008-09-04 15:27:20.000000000 -0700
+++ b/net/bridge/br_sysfs_br.c	2008-09-04 15:33:31.000000000 -0700
@@ -29,11 +29,12 @@
  */
 static ssize_t store_bridge_parm(struct device *d,
 				 const char *buf, size_t len,
-				 void (*set)(struct net_bridge *, unsigned long))
+				 int (*set)(struct net_bridge *, unsigned long))
 {
 	struct net_bridge *br = to_bridge(d);
 	char *endp;
 	unsigned long val;
+	int err;
 
 	if (!capable(CAP_NET_ADMIN))
 		return -EPERM;
@@ -43,9 +44,9 @@ static ssize_t store_bridge_parm(struct 
 		return -EINVAL;
 
 	spin_lock_bh(&br->lock);
-	(*set)(br, val);
+	err = (*set)(br, val);
 	spin_unlock_bh(&br->lock);
-	return len;
+	return err ? err : len;
 }
 
 
@@ -56,12 +57,13 @@ static ssize_t show_forward_delay(struct
 	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
 }
 
-static void set_forward_delay(struct net_bridge *br, unsigned long val)
+static int set_forward_delay(struct net_bridge *br, unsigned long val)
 {
 	unsigned long delay = clock_t_to_jiffies(val);
 	br->forward_delay = delay;
 	if (br_is_root_bridge(br))
 		br->bridge_forward_delay = delay;
+	return 0;
 }
 
 static ssize_t store_forward_delay(struct device *d,
@@ -80,12 +82,17 @@ static ssize_t show_hello_time(struct de
 		       jiffies_to_clock_t(to_bridge(d)->hello_time));
 }
 
-static void set_hello_time(struct net_bridge *br, unsigned long val)
+static int set_hello_time(struct net_bridge *br, unsigned long val)
 {
 	unsigned long t = clock_t_to_jiffies(val);
+
+	if (t < HZ)
+		return -EINVAL;
+
 	br->hello_time = t;
 	if (br_is_root_bridge(br))
 		br->bridge_hello_time = t;
+	return 0;
 }
 
 static ssize_t store_hello_time(struct device *d,
@@ -104,12 +111,13 @@ static ssize_t show_max_age(struct devic
 		       jiffies_to_clock_t(to_bridge(d)->max_age));
 }
 
-static void set_max_age(struct net_bridge *br, unsigned long val)
+static int set_max_age(struct net_bridge *br, unsigned long val)
 {
 	unsigned long t = clock_t_to_jiffies(val);
 	br->max_age = t;
 	if (br_is_root_bridge(br))
 		br->bridge_max_age = t;
+	return 0;
 }
 
 static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
@@ -126,9 +134,10 @@ static ssize_t show_ageing_time(struct d
 	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
 }
 
-static void set_ageing_time(struct net_bridge *br, unsigned long val)
+static int set_ageing_time(struct net_bridge *br, unsigned long val)
 {
 	br->ageing_time = clock_t_to_jiffies(val);
+	return 0;
 }
 
 static ssize_t store_ageing_time(struct device *d,
@@ -180,9 +189,10 @@ static ssize_t show_priority(struct devi
 		       (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
 }
 
-static void set_priority(struct net_bridge *br, unsigned long val)
+static int set_priority(struct net_bridge *br, unsigned long val)
 {
 	br_stp_set_bridge_priority(br, (u16) val);
+	return 0;
 }
 
 static ssize_t store_priority(struct device *d, struct device_attribute *attr,

Re: [PATCH] bridge: don't allow setting hello time to zero

[David Miller]

From: Stephen Hemminger <shemminger@vyatta.com>
Date: Thu, 4 Sep 2008 15:47:09 -0700

> The bridge hello time can't be safely set to values less than 1 second,
> otherwise it is possible to end up with a runaway timer.
> 
> Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

Applied, thanks Stephen.

I added more information to the commit message so that Dushan's
incredibly contribution to this bug getting fixed are mentioned.
I don't see how we would have figured out Bridging as even the
cause without his detective work.  So it's definitely wrong not
to give him at least some mention in the commit message :-/

bridge: don't allow setting hello time to zero

Dushan Tcholich reports that on his system ksoftirqd can consume
between %6 to %10 of cpu time, and cause ~200 context switches per
second.

He then correlated this with a report by bdupree@techfinesse.com:

	http://marc.info/?l=linux-kernel&m=119613299024398&w=2

and the culprit cause seems to be starting the bridge interface.
In particular, when starting the bridge interface, his scripts
are specifying a hello timer interval of "0".

The bridge hello time can't be safely set to values less than 1
second, otherwise it is possible to end up with a runaway timer.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/bridge/br_ioctl.c    |    8 +++++++-
 net/bridge/br_sysfs_br.c |   26 ++++++++++++++++++--------
 2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c
index eeee218..5bbf073 100644
--- a/net/bridge/br_ioctl.c
+++ b/net/bridge/br_ioctl.c
@@ -188,15 +188,21 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 		return 0;
 
 	case BRCTL_SET_BRIDGE_HELLO_TIME:
+	{
+		unsigned long t = clock_t_to_jiffies(args[1]);
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;
 
+		if (t < HZ)
+			return -EINVAL;
+
 		spin_lock_bh(&br->lock);
-		br->bridge_hello_time = clock_t_to_jiffies(args[1]);
+		br->bridge_hello_time = t;
 		if (br_is_root_bridge(br))
 			br->hello_time = br->bridge_hello_time;
 		spin_unlock_bh(&br->lock);
 		return 0;
+	}
 
 	case BRCTL_SET_BRIDGE_MAX_AGE:
 		if (!capable(CAP_NET_ADMIN))
diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
index 27d6a51..158dee8 100644
--- a/net/bridge/br_sysfs_br.c
+++ b/net/bridge/br_sysfs_br.c
@@ -29,11 +29,12 @@
  */
 static ssize_t store_bridge_parm(struct device *d,
 				 const char *buf, size_t len,
-				 void (*set)(struct net_bridge *, unsigned long))
+				 int (*set)(struct net_bridge *, unsigned long))
 {
 	struct net_bridge *br = to_bridge(d);
 	char *endp;
 	unsigned long val;
+	int err;
 
 	if (!capable(CAP_NET_ADMIN))
 		return -EPERM;
@@ -43,9 +44,9 @@ static ssize_t store_bridge_parm(struct device *d,
 		return -EINVAL;
 
 	spin_lock_bh(&br->lock);
-	(*set)(br, val);
+	err = (*set)(br, val);
 	spin_unlock_bh(&br->lock);
-	return len;
+	return err ? err : len;
 }
 
 
@@ -56,12 +57,13 @@ static ssize_t show_forward_delay(struct device *d,
 	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
 }
 
-static void set_forward_delay(struct net_bridge *br, unsigned long val)
+static int set_forward_delay(struct net_bridge *br, unsigned long val)
 {
 	unsigned long delay = clock_t_to_jiffies(val);
 	br->forward_delay = delay;
 	if (br_is_root_bridge(br))
 		br->bridge_forward_delay = delay;
+	return 0;
 }
 
 static ssize_t store_forward_delay(struct device *d,
@@ -80,12 +82,17 @@ static ssize_t show_hello_time(struct device *d, struct device_attribute *attr,
 		       jiffies_to_clock_t(to_bridge(d)->hello_time));
 }
 
-static void set_hello_time(struct net_bridge *br, unsigned long val)
+static int set_hello_time(struct net_bridge *br, unsigned long val)
 {
 	unsigned long t = clock_t_to_jiffies(val);
+
+	if (t < HZ)
+		return -EINVAL;
+
 	br->hello_time = t;
 	if (br_is_root_bridge(br))
 		br->bridge_hello_time = t;
+	return 0;
 }
 
 static ssize_t store_hello_time(struct device *d,
@@ -104,12 +111,13 @@ static ssize_t show_max_age(struct device *d, struct device_attribute *attr,
 		       jiffies_to_clock_t(to_bridge(d)->max_age));
 }
 
-static void set_max_age(struct net_bridge *br, unsigned long val)
+static int set_max_age(struct net_bridge *br, unsigned long val)
 {
 	unsigned long t = clock_t_to_jiffies(val);
 	br->max_age = t;
 	if (br_is_root_bridge(br))
 		br->bridge_max_age = t;
+	return 0;
 }
 
 static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
@@ -126,9 +134,10 @@ static ssize_t show_ageing_time(struct device *d,
 	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
 }
 
-static void set_ageing_time(struct net_bridge *br, unsigned long val)
+static int set_ageing_time(struct net_bridge *br, unsigned long val)
 {
 	br->ageing_time = clock_t_to_jiffies(val);
+	return 0;
 }
 
 static ssize_t store_ageing_time(struct device *d,
@@ -180,9 +189,10 @@ static ssize_t show_priority(struct device *d, struct device_attribute *attr,
 		       (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
 }
 
-static void set_priority(struct net_bridge *br, unsigned long val)
+static int set_priority(struct net_bridge *br, unsigned long val)
 {
 	br_stp_set_bridge_priority(br, (u16) val);
+	return 0;
 }
 
 static ssize_t store_priority(struct device *d, struct device_attribute *attr,
-- 
1.5.6.5.GIT

Re: [PATCH] bridge: don't allow setting hello time to zero

[Dushan Tcholich]

On Mon, Sep 8, 2008 at 10:46 PM, David Miller <davem@davemloft.net> wrote:
> From: Stephen Hemminger <shemminger@vyatta.com>
> Date: Thu, 4 Sep 2008 15:47:09 -0700
>
>> The bridge hello time can't be safely set to values less than 1 second,
>> otherwise it is possible to end up with a runaway timer.
>>
>> Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
>
> Applied, thanks Stephen.
>
> I added more information to the commit message so that Dushan's
> incredibly contribution to this bug getting fixed are mentioned.
> I don't see how we would have figured out Bridging as even the
> cause without his detective work.  So it's definitely wrong not
> to give him at least some mention in the commit message :-/
>

I don't know what to say :)

Thank you
> bridge: don't allow setting hello time to zero
>
> Dushan Tcholich reports that on his system ksoftirqd can consume
> between %6 to %10 of cpu time, and cause ~200 context switches per
> second.
>
A little nitpick: 200 times greater context switch rate :), like
100000 per second.

> He then correlated this with a report by bdupree@techfinesse.com:
>
>        http://marc.info/?l=linux-kernel&m=119613299024398&w=2
>
> and the culprit cause seems to be starting the bridge interface.
> In particular, when starting the bridge interface, his scripts
> are specifying a hello timer interval of "0".
>
> The bridge hello time can't be safely set to values less than 1
> second, otherwise it is possible to end up with a runaway timer.

Btw. is there a way to make the command to turn STP off work too?
brctl stp br0 off
Because AFAIK if I shut down STP the hello timer should shut down too,
but it still continues to work.

Thank you for your time and effort

Dushan Tcholich

>
> Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
> Signed-off-by: David S. Miller <davem@davemloft.net>
> ---
>  net/bridge/br_ioctl.c    |    8 +++++++-
>  net/bridge/br_sysfs_br.c |   26 ++++++++++++++++++--------
>  2 files changed, 25 insertions(+), 9 deletions(-)
>
> diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c
> index eeee218..5bbf073 100644
> --- a/net/bridge/br_ioctl.c
> +++ b/net/bridge/br_ioctl.c
> @@ -188,15 +188,21 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
>                return 0;
>
>        case BRCTL_SET_BRIDGE_HELLO_TIME:
> +       {
> +               unsigned long t = clock_t_to_jiffies(args[1]);
>                if (!capable(CAP_NET_ADMIN))
>                        return -EPERM;
>
> +               if (t < HZ)
> +                       return -EINVAL;
> +
>                spin_lock_bh(&br->lock);
> -               br->bridge_hello_time = clock_t_to_jiffies(args[1]);
> +               br->bridge_hello_time = t;
>                if (br_is_root_bridge(br))
>                        br->hello_time = br->bridge_hello_time;
>                spin_unlock_bh(&br->lock);
>                return 0;
> +       }
>
>        case BRCTL_SET_BRIDGE_MAX_AGE:
>                if (!capable(CAP_NET_ADMIN))
> diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
> index 27d6a51..158dee8 100644
> --- a/net/bridge/br_sysfs_br.c
> +++ b/net/bridge/br_sysfs_br.c
> @@ -29,11 +29,12 @@
>  */
>  static ssize_t store_bridge_parm(struct device *d,
>                                 const char *buf, size_t len,
> -                                void (*set)(struct net_bridge *, unsigned long))
> +                                int (*set)(struct net_bridge *, unsigned long))
>  {
>        struct net_bridge *br = to_bridge(d);
>        char *endp;
>        unsigned long val;
> +       int err;
>
>        if (!capable(CAP_NET_ADMIN))
>                return -EPERM;
> @@ -43,9 +44,9 @@ static ssize_t store_bridge_parm(struct device *d,
>                return -EINVAL;
>
>        spin_lock_bh(&br->lock);
> -       (*set)(br, val);
> +       err = (*set)(br, val);
>        spin_unlock_bh(&br->lock);
> -       return len;
> +       return err ? err : len;
>  }
>
>
> @@ -56,12 +57,13 @@ static ssize_t show_forward_delay(struct device *d,
>        return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
>  }
>
> -static void set_forward_delay(struct net_bridge *br, unsigned long val)
> +static int set_forward_delay(struct net_bridge *br, unsigned long val)
>  {
>        unsigned long delay = clock_t_to_jiffies(val);
>        br->forward_delay = delay;
>        if (br_is_root_bridge(br))
>                br->bridge_forward_delay = delay;
> +       return 0;
>  }
>
>  static ssize_t store_forward_delay(struct device *d,
> @@ -80,12 +82,17 @@ static ssize_t show_hello_time(struct device *d, struct device_attribute *attr,
>                       jiffies_to_clock_t(to_bridge(d)->hello_time));
>  }
>
> -static void set_hello_time(struct net_bridge *br, unsigned long val)
> +static int set_hello_time(struct net_bridge *br, unsigned long val)
>  {
>        unsigned long t = clock_t_to_jiffies(val);
> +
> +       if (t < HZ)
> +               return -EINVAL;
> +
>        br->hello_time = t;
>        if (br_is_root_bridge(br))
>                br->bridge_hello_time = t;
> +       return 0;
>  }
>
>  static ssize_t store_hello_time(struct device *d,
> @@ -104,12 +111,13 @@ static ssize_t show_max_age(struct device *d, struct device_attribute *attr,
>                       jiffies_to_clock_t(to_bridge(d)->max_age));
>  }
>
> -static void set_max_age(struct net_bridge *br, unsigned long val)
> +static int set_max_age(struct net_bridge *br, unsigned long val)
>  {
>        unsigned long t = clock_t_to_jiffies(val);
>        br->max_age = t;
>        if (br_is_root_bridge(br))
>                br->bridge_max_age = t;
> +       return 0;
>  }
>
>  static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
> @@ -126,9 +134,10 @@ static ssize_t show_ageing_time(struct device *d,
>        return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
>  }
>
> -static void set_ageing_time(struct net_bridge *br, unsigned long val)
> +static int set_ageing_time(struct net_bridge *br, unsigned long val)
>  {
>        br->ageing_time = clock_t_to_jiffies(val);
> +       return 0;
>  }
>
>  static ssize_t store_ageing_time(struct device *d,
> @@ -180,9 +189,10 @@ static ssize_t show_priority(struct device *d, struct device_attribute *attr,
>                       (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
>  }
>
> -static void set_priority(struct net_bridge *br, unsigned long val)
> +static int set_priority(struct net_bridge *br, unsigned long val)
>  {
>        br_stp_set_bridge_priority(br, (u16) val);
> +       return 0;
>  }
>
>  static ssize_t store_priority(struct device *d, struct device_attribute *attr,
> --
> 1.5.6.5.GIT
>
>

Re: [PATCH] bridge: don't allow setting hello time to zero

[Stephen Hemminger]

On Mon, 8 Sep 2008 23:35:19 +0200
"Dushan Tcholich" <dusanc@gmail.com> wrote:

> On Mon, Sep 8, 2008 at 10:46 PM, David Miller <davem@davemloft.net> wrote:
> > From: Stephen Hemminger <shemminger@vyatta.com>
> > Date: Thu, 4 Sep 2008 15:47:09 -0700
> >
> >> The bridge hello time can't be safely set to values less than 1 second,
> >> otherwise it is possible to end up with a runaway timer.
> >>
> >> Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
> >
> > Applied, thanks Stephen.
> >
> > I added more information to the commit message so that Dushan's
> > incredibly contribution to this bug getting fixed are mentioned.
> > I don't see how we would have figured out Bridging as even the
> > cause without his detective work.  So it's definitely wrong not
> > to give him at least some mention in the commit message :-/
> >
> 
> I don't know what to say :)
> 
> Thank you
> > bridge: don't allow setting hello time to zero
> >
> > Dushan Tcholich reports that on his system ksoftirqd can consume
> > between %6 to %10 of cpu time, and cause ~200 context switches per
> > second.
> >
> A little nitpick: 200 times greater context switch rate :), like
> 100000 per second.
> 
> > He then correlated this with a report by bdupree@techfinesse.com:
> >
> >        http://marc.info/?l=linux-kernel&m=119613299024398&w=2
> >
> > and the culprit cause seems to be starting the bridge interface.
> > In particular, when starting the bridge interface, his scripts
> > are specifying a hello timer interval of "0".
> >
> > The bridge hello time can't be safely set to values less than 1
> > second, otherwise it is possible to end up with a runaway timer.
> 
> Btw. is there a way to make the command to turn STP off work too?
> brctl stp br0 off
> Because AFAIK if I shut down STP the hello timer should shut down too,
> but it still continues to work.
> 
> Thank you for your time and effort
> 
> Dushan Tcholich
>

The basics:
* Hello timer is always enabled
* STP defaults to off unless you turn it on
* Turn STP on/off with brctl.

In the existing design, the hello timer always runs, even when STP
is not turned on. If STP is not enabled, the packet is just never
created.  Fixing it would not be hard (or gain much), but would have
to deal with complex lock ordering and timer problems, so it isn't
worth fixing for current releases.

ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1

[Dushan Tcholich]

Hello

This is my first bugreport on LKML so please be patient :)

top always shows me that ksoftirqd usualy gets around 8%CPU, it
changes between 6 and 10%.
It's sometimes ksoftirqd/0 sometimes /1, differs on the reboot but
doesn't change during work.
I noticed it because it had very high time+, 500hours or so.
I reproduced these problems with kernels 2.6.24 .25 and .27-rc1-mm1. I
don't remember that this happened during .22 and .23 kernels, but I
can check again if it's necessary.
Timer freq is 1000Hz

What I tried without changes with help from ##kernel:
1. built kernel without kvm;
2. disconnected all usb hw except mouse;
3. run glxgears which consumed 98% CPU and ksoftirqd  2%;
4. Tried to stress disk subsystem by copying a lot of small files on
the same partition:
time cp -R /usr/portage/* /tmp/1
real 2m17.530s
user 0m0.764s
sys 0m18.596s

it was 127507 items 1.5GB, but just pdflush jumped to 14% from time to time;
5. disabled serial port in BIOS because my UPS was connected to it,
and I suspected that it was maybe polling too much;
6. disconnected eth cable
7. tried googling but all I found is that some people had similar
problem. Some TV cards were the culprit but I don't have that HW.

If you need any more data please cc me as I'm not subscribed

Thanks for your time
Dushan Tcholich

Additional data:

uname -a
Linux krshina3 2.6.25-gentoo-r6 #1 SMP Thu Jul 17 17:35:31 CEST 2008
i686 Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz GenuineIntel GNU/Linux

cat /proc/interrupts - taken shortly after reboot
           CPU0       CPU1
  0:        259          0   IO-APIC-edge      timer
  1:       1041          0   IO-APIC-edge      i8042
  8:          2          0   IO-APIC-edge      rtc
  9:          0          0   IO-APIC-fasteoi   acpi
 16:      44916          0   IO-APIC-fasteoi   uhci_hcd:usb3,
radeon@pci:0000:01:00.0
 18:         21          0   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb7
 19:      12579          0   IO-APIC-fasteoi   ata_piix, ata_piix, uhci_hcd:usb6
 21:       6705          0   IO-APIC-fasteoi   uhci_hcd:usb4, eth0
 22:        193          0   IO-APIC-fasteoi   HDA Intel
 23:         61          0   IO-APIC-fasteoi   ehci_hcd:usb2, uhci_hcd:usb5
NMI:          0          0   Non-maskable interrupts
LOC:     189151     175330   Local timer interrupts
RES:       1364       1465   Rescheduling interrupts
CAL:        564       4069   function call interrupts
TLB:       1071       1140   TLB shootdowns
TRM:          0          0   Thermal event interrupts
SPU:          0          0   Spurious interrupts
ERR:          0
MIS:          0

lspci
00:00.0 Host bridge: Intel Corporation 82P965/G965 Memory Controller
Hub (rev 02)
00:01.0 PCI bridge: Intel Corporation 82P965/G965 PCI Express Root Port (rev 02)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB
UHCI Contoller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB
UHCI Controller #5 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2
EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express
Port 1 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB
UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB
UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB
UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2
EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev f2)
00:1f.0 ISA bridge: Intel Corporation 82801HB/HR (ICH8/R) LPC
Interface Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801H (ICH8 Family) 4 port
SATA IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02)
00:1f.5 IDE interface: Intel Corporation 82801H (ICH8 Family) 2 port
SATA IDE Controller (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc R430 [Radeon
X800 XL] (PCIe)
01:00.1 Display controller: ATI Technologies Inc R430 [Radeon X800 XL]
(PCIe) (Secondary)
03:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8110SC/8169SC Gigabit Ethernet (rev 10)

.config

#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.25-gentoo-r6
# Mon Aug  4 14:42:16 2008
#
# CONFIG_64BIT is not set
CONFIG_X86_32=y
# CONFIG_X86_64 is not set
CONFIG_X86=y
CONFIG_ARCH_DEFCONFIG="arch/x86/configs/i386_defconfig"
# CONFIG_GENERIC_LOCKBREAK is not set
CONFIG_GENERIC_TIME=y
CONFIG_GENERIC_CMOS_UPDATE=y
CONFIG_CLOCKSOURCE_WATCHDOG=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_HAVE_LATENCYTOP_SUPPORT=y
CONFIG_SEMAPHORE_SLEEPERS=y
CONFIG_FAST_CMPXCHG_LOCAL=y
CONFIG_MMU=y
CONFIG_ZONE_DMA=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_IOMAP=y
CONFIG_GENERIC_BUG=y
CONFIG_GENERIC_HWEIGHT=y
# CONFIG_GENERIC_GPIO is not set
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_DMI=y
# CONFIG_RWSEM_GENERIC_SPINLOCK is not set
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
# CONFIG_ARCH_HAS_ILOG2_U32 is not set
# CONFIG_ARCH_HAS_ILOG2_U64 is not set
CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
# CONFIG_GENERIC_TIME_VSYSCALL is not set
CONFIG_ARCH_HAS_CPU_RELAX=y
# CONFIG_HAVE_SETUP_PER_CPU_AREA is not set
CONFIG_ARCH_HIBERNATION_POSSIBLE=y
CONFIG_ARCH_SUSPEND_POSSIBLE=y
# CONFIG_ZONE_DMA32 is not set
CONFIG_ARCH_POPULATES_NODE_MAP=y
# CONFIG_AUDIT_ARCH is not set
CONFIG_ARCH_SUPPORTS_AOUT=y
CONFIG_GENERIC_HARDIRQS=y
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_GENERIC_PENDING_IRQ=y
CONFIG_X86_SMP=y
CONFIG_X86_32_SMP=y
CONFIG_X86_HT=y
CONFIG_X86_BIOS_REBOOT=y
CONFIG_X86_TRAMPOLINE=y
CONFIG_KTIME_SCALAR=y
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"

#
# General setup
#
CONFIG_EXPERIMENTAL=y
CONFIG_LOCK_KERNEL=y
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_LOCALVERSION=""
CONFIG_LOCALVERSION_AUTO=y
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
# CONFIG_POSIX_MQUEUE is not set
# CONFIG_BSD_PROCESS_ACCT is not set
# CONFIG_TASKSTATS is not set
# CONFIG_AUDIT is not set
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_LOG_BUF_SHIFT=15
# CONFIG_CGROUPS is not set
CONFIG_GROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
# CONFIG_RT_GROUP_SCHED is not set
CONFIG_USER_SCHED=y
# CONFIG_CGROUP_SCHED is not set
CONFIG_SYSFS_DEPRECATED=y
CONFIG_SYSFS_DEPRECATED_V2=y
# CONFIG_RELAY is not set
CONFIG_NAMESPACES=y
# CONFIG_UTS_NS is not set
# CONFIG_IPC_NS is not set
# CONFIG_USER_NS is not set
# CONFIG_PID_NS is not set
CONFIG_BLK_DEV_INITRD=y
CONFIG_INITRAMFS_SOURCE=""
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
CONFIG_SYSCTL=y
# CONFIG_EMBEDDED is not set
CONFIG_UID16=y
CONFIG_SYSCTL_SYSCALL=y
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
# CONFIG_KALLSYMS_EXTRA_PASS is not set
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_COMPAT_BRK=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_ANON_INODES=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
CONFIG_EVENTFD=y
CONFIG_SHMEM=y
CONFIG_VM_EVENT_COUNTERS=y
CONFIG_SLAB=y
# CONFIG_SLUB is not set
# CONFIG_SLOB is not set
# CONFIG_PROFILING is not set
# CONFIG_MARKERS is not set
CONFIG_HAVE_OPROFILE=y
CONFIG_HAVE_KPROBES=y
CONFIG_HAVE_KRETPROBES=y
CONFIG_PROC_PAGE_MONITOR=y
CONFIG_SLABINFO=y
CONFIG_RT_MUTEXES=y
# CONFIG_TINY_SHMEM is not set
CONFIG_BASE_SMALL=0
# CONFIG_MODULES is not set
CONFIG_BLOCK=y
# CONFIG_LBD is not set
# CONFIG_BLK_DEV_IO_TRACE is not set
# CONFIG_LSF is not set
# CONFIG_BLK_DEV_BSG is not set

#
# IO Schedulers
#
CONFIG_IOSCHED_NOOP=y
# CONFIG_IOSCHED_AS is not set
# CONFIG_IOSCHED_DEADLINE is not set
CONFIG_IOSCHED_CFQ=y
# CONFIG_DEFAULT_AS is not set
# CONFIG_DEFAULT_DEADLINE is not set
CONFIG_DEFAULT_CFQ=y
# CONFIG_DEFAULT_NOOP is not set
CONFIG_DEFAULT_IOSCHED="cfq"
CONFIG_CLASSIC_RCU=y

#
# Processor type and features
#
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
CONFIG_SMP=y
# CONFIG_X86_PC is not set
# CONFIG_X86_ELAN is not set
# CONFIG_X86_VOYAGER is not set
# CONFIG_X86_NUMAQ is not set
# CONFIG_X86_SUMMIT is not set
# CONFIG_X86_BIGSMP is not set
# CONFIG_X86_VISWS is not set
CONFIG_X86_GENERICARCH=y
# CONFIG_X86_ES7000 is not set
# CONFIG_X86_RDC321X is not set
# CONFIG_X86_VSMP is not set
CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
# CONFIG_PARAVIRT_GUEST is not set
CONFIG_X86_CYCLONE_TIMER=y
# CONFIG_M386 is not set
# CONFIG_M486 is not set
# CONFIG_M586 is not set
# CONFIG_M586TSC is not set
# CONFIG_M586MMX is not set
# CONFIG_M686 is not set
# CONFIG_MPENTIUMII is not set
# CONFIG_MPENTIUMIII is not set
# CONFIG_MPENTIUMM is not set
# CONFIG_MPENTIUM4 is not set
# CONFIG_MK6 is not set
# CONFIG_MK7 is not set
# CONFIG_MK8 is not set
# CONFIG_MCRUSOE is not set
# CONFIG_MEFFICEON is not set
# CONFIG_MWINCHIPC6 is not set
# CONFIG_MWINCHIP2 is not set
# CONFIG_MWINCHIP3D is not set
# CONFIG_MGEODEGX1 is not set
# CONFIG_MGEODE_LX is not set
# CONFIG_MCYRIXIII is not set
# CONFIG_MVIAC3_2 is not set
# CONFIG_MVIAC7 is not set
# CONFIG_MPSC is not set
CONFIG_MCORE2=y
# CONFIG_GENERIC_CPU is not set
# CONFIG_X86_GENERIC is not set
CONFIG_X86_CMPXCHG=y
CONFIG_X86_L1_CACHE_SHIFT=6
CONFIG_X86_XADD=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_P6_NOP=y
CONFIG_X86_TSC=y
CONFIG_X86_MINIMUM_CPU_FAMILY=6
CONFIG_X86_DEBUGCTLMSR=y
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
# CONFIG_IOMMU_HELPER is not set
CONFIG_NR_CPUS=2
# CONFIG_SCHED_SMT is not set
CONFIG_SCHED_MC=y
# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_MCE=y
# CONFIG_X86_MCE_NONFATAL is not set
# CONFIG_X86_MCE_P4THERMAL is not set
CONFIG_VM86=y
# CONFIG_TOSHIBA is not set
# CONFIG_I8K is not set
# CONFIG_X86_REBOOTFIXUPS is not set
# CONFIG_MICROCODE is not set
CONFIG_X86_MSR=y
CONFIG_X86_CPUID=y
# CONFIG_NOHIGHMEM is not set
CONFIG_HIGHMEM4G=y
# CONFIG_HIGHMEM64G is not set
CONFIG_PAGE_OFFSET=0xC0000000
CONFIG_HIGHMEM=y
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_FLATMEM_MANUAL=y
# CONFIG_DISCONTIGMEM_MANUAL is not set
# CONFIG_SPARSEMEM_MANUAL is not set
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
# CONFIG_SPARSEMEM_STATIC is not set
# CONFIG_SPARSEMEM_VMEMMAP_ENABLE is not set
CONFIG_SPLIT_PTLOCK_CPUS=4
# CONFIG_RESOURCES_64BIT is not set
CONFIG_ZONE_DMA_FLAG=1
CONFIG_BOUNCE=y
CONFIG_VIRT_TO_BUS=y
# CONFIG_HIGHPTE is not set
# CONFIG_MATH_EMULATION is not set
CONFIG_MTRR=y
# CONFIG_EFI is not set
CONFIG_IRQBALANCE=y
CONFIG_SECCOMP=y
# CONFIG_HZ_100 is not set
# CONFIG_HZ_250 is not set
# CONFIG_HZ_300 is not set
CONFIG_HZ_1000=y
CONFIG_HZ=1000
CONFIG_SCHED_HRTICK=y
# CONFIG_KEXEC is not set
# CONFIG_CRASH_DUMP is not set
CONFIG_PHYSICAL_START=0x100000
# CONFIG_RELOCATABLE is not set
CONFIG_PHYSICAL_ALIGN=0x100000
# CONFIG_HOTPLUG_CPU is not set
# CONFIG_COMPAT_VDSO is not set
CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y

#
# Power management options
#
CONFIG_PM=y
# CONFIG_PM_LEGACY is not set
# CONFIG_PM_DEBUG is not set
# CONFIG_SUSPEND is not set
# CONFIG_HIBERNATION is not set
CONFIG_ACPI=y
CONFIG_ACPI_PROCFS=y
CONFIG_ACPI_PROCFS_POWER=y
CONFIG_ACPI_SYSFS_POWER=y
CONFIG_ACPI_PROC_EVENT=y
# CONFIG_ACPI_AC is not set
# CONFIG_ACPI_BATTERY is not set
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_FAN=y
CONFIG_ACPI_DOCK=y
# CONFIG_ACPI_BAY is not set
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_THERMAL=y
# CONFIG_ACPI_WMI is not set
# CONFIG_ACPI_ASUS is not set
# CONFIG_ACPI_TOSHIBA is not set
# CONFIG_ACPI_CUSTOM_DSDT is not set
CONFIG_ACPI_BLACKLIST_YEAR=2001
# CONFIG_ACPI_DEBUG is not set
CONFIG_ACPI_EC=y
CONFIG_ACPI_POWER=y
CONFIG_ACPI_SYSTEM=y
CONFIG_X86_PM_TIMER=y
# CONFIG_ACPI_CONTAINER is not set
# CONFIG_ACPI_SBS is not set

#
# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_TABLE=y
# CONFIG_CPU_FREQ_DEBUG is not set
# CONFIG_CPU_FREQ_STAT is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
# CONFIG_CPU_FREQ_GOV_PERFORMANCE is not set
# CONFIG_CPU_FREQ_GOV_POWERSAVE is not set
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
# CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set

#
# CPUFreq processor drivers
#
CONFIG_X86_ACPI_CPUFREQ=y
# CONFIG_X86_POWERNOW_K6 is not set
# CONFIG_X86_POWERNOW_K7 is not set
# CONFIG_X86_POWERNOW_K8 is not set
# CONFIG_X86_GX_SUSPMOD is not set
# CONFIG_X86_SPEEDSTEP_CENTRINO is not set
# CONFIG_X86_SPEEDSTEP_ICH is not set
# CONFIG_X86_SPEEDSTEP_SMI is not set
# CONFIG_X86_P4_CLOCKMOD is not set
# CONFIG_X86_CPUFREQ_NFORCE2 is not set
# CONFIG_X86_LONGRUN is not set
# CONFIG_X86_LONGHAUL is not set
# CONFIG_X86_E_POWERSAVER is not set

#
# shared options
#
# CONFIG_X86_ACPI_CPUFREQ_PROC_INTF is not set
# CONFIG_X86_SPEEDSTEP_LIB is not set
# CONFIG_CPU_IDLE is not set

#
# Bus options (PCI etc.)
#
CONFIG_PCI=y
# CONFIG_PCI_GOBIOS is not set
# CONFIG_PCI_GOMMCONFIG is not set
# CONFIG_PCI_GODIRECT is not set
CONFIG_PCI_GOANY=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_PCI_MMCONFIG=y
CONFIG_PCI_DOMAINS=y
CONFIG_PCIEPORTBUS=y
# CONFIG_PCIEAER is not set
CONFIG_ARCH_SUPPORTS_MSI=y
CONFIG_PCI_MSI=y
# CONFIG_PCI_LEGACY is not set
# CONFIG_PCI_DEBUG is not set
# CONFIG_HT_IRQ is not set
CONFIG_ISA_DMA_API=y
# CONFIG_ISA is not set
# CONFIG_MCA is not set
# CONFIG_SCx200 is not set
# CONFIG_PCCARD is not set
# CONFIG_HOTPLUG_PCI is not set

#
# Executable file formats / Emulations
#
CONFIG_BINFMT_ELF=y
# CONFIG_BINFMT_AOUT is not set
# CONFIG_BINFMT_MISC is not set

#
# Networking
#
CONFIG_NET=y

#
# Networking options
#
CONFIG_PACKET=y
# CONFIG_PACKET_MMAP is not set
CONFIG_UNIX=y
CONFIG_XFRM=y
# CONFIG_XFRM_USER is not set
# CONFIG_XFRM_SUB_POLICY is not set
# CONFIG_XFRM_MIGRATE is not set
# CONFIG_XFRM_STATISTICS is not set
# CONFIG_NET_KEY is not set
CONFIG_INET=y
# CONFIG_IP_MULTICAST is not set
# CONFIG_IP_ADVANCED_ROUTER is not set
CONFIG_IP_FIB_HASH=y
# CONFIG_IP_PNP is not set
# CONFIG_NET_IPIP is not set
# CONFIG_NET_IPGRE is not set
# CONFIG_ARPD is not set
# CONFIG_SYN_COOKIES is not set
# CONFIG_INET_AH is not set
# CONFIG_INET_ESP is not set
# CONFIG_INET_IPCOMP is not set
# CONFIG_INET_XFRM_TUNNEL is not set
# CONFIG_INET_TUNNEL is not set
CONFIG_INET_XFRM_MODE_TRANSPORT=y
CONFIG_INET_XFRM_MODE_TUNNEL=y
CONFIG_INET_XFRM_MODE_BEET=y
CONFIG_INET_LRO=y
CONFIG_INET_DIAG=y
CONFIG_INET_TCP_DIAG=y
# CONFIG_TCP_CONG_ADVANCED is not set
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
# CONFIG_TCP_MD5SIG is not set
# CONFIG_IPV6 is not set
# CONFIG_INET6_XFRM_TUNNEL is not set
# CONFIG_INET6_TUNNEL is not set
# CONFIG_NETWORK_SECMARK is not set
# CONFIG_NETFILTER is not set
# CONFIG_IP_DCCP is not set
# CONFIG_IP_SCTP is not set
# CONFIG_TIPC is not set
# CONFIG_ATM is not set
CONFIG_BRIDGE=y
# CONFIG_VLAN_8021Q is not set
# CONFIG_DECNET is not set
CONFIG_LLC=y
# CONFIG_LLC2 is not set
# CONFIG_IPX is not set
# CONFIG_ATALK is not set
# CONFIG_X25 is not set
# CONFIG_LAPB is not set
# CONFIG_ECONET is not set
# CONFIG_WAN_ROUTER is not set
# CONFIG_NET_SCHED is not set

#
# Network testing
#
# CONFIG_NET_PKTGEN is not set
# CONFIG_HAMRADIO is not set
# CONFIG_CAN is not set
# CONFIG_IRDA is not set
# CONFIG_BT is not set
# CONFIG_AF_RXRPC is not set

#
# Wireless
#
# CONFIG_CFG80211 is not set
# CONFIG_WIRELESS_EXT is not set
# CONFIG_MAC80211 is not set
# CONFIG_IEEE80211 is not set
# CONFIG_RFKILL is not set
# CONFIG_NET_9P is not set

#
# Device Drivers
#

#
# Generic Driver Options
#
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
# CONFIG_FW_LOADER is not set
# CONFIG_DEBUG_DRIVER is not set
# CONFIG_DEBUG_DEVRES is not set
# CONFIG_SYS_HYPERVISOR is not set
# CONFIG_CONNECTOR is not set
# CONFIG_MTD is not set
# CONFIG_PARPORT is not set
CONFIG_PNP=y
# CONFIG_PNP_DEBUG is not set

#
# Protocols
#
CONFIG_PNPACPI=y
CONFIG_BLK_DEV=y
# CONFIG_BLK_DEV_FD is not set
# CONFIG_BLK_CPQ_DA is not set
# CONFIG_BLK_CPQ_CISS_DA is not set
# CONFIG_BLK_DEV_DAC960 is not set
# CONFIG_BLK_DEV_UMEM is not set
# CONFIG_BLK_DEV_COW_COMMON is not set
CONFIG_BLK_DEV_LOOP=y
# CONFIG_BLK_DEV_CRYPTOLOOP is not set
# CONFIG_BLK_DEV_NBD is not set
# CONFIG_BLK_DEV_SX8 is not set
# CONFIG_BLK_DEV_UB is not set
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_COUNT=16
CONFIG_BLK_DEV_RAM_SIZE=4096
# CONFIG_BLK_DEV_XIP is not set
CONFIG_CDROM_PKTCDVD=y
CONFIG_CDROM_PKTCDVD_BUFFERS=8
# CONFIG_CDROM_PKTCDVD_WCACHE is not set
# CONFIG_ATA_OVER_ETH is not set
# CONFIG_MISC_DEVICES is not set
CONFIG_HAVE_IDE=y
# CONFIG_IDE is not set

#
# SCSI device support
#
# CONFIG_RAID_ATTRS is not set
CONFIG_SCSI=y
CONFIG_SCSI_DMA=y
# CONFIG_SCSI_TGT is not set
# CONFIG_SCSI_NETLINK is not set
# CONFIG_SCSI_PROC_FS is not set

#
# SCSI support type (disk, tape, CD-ROM)
#
CONFIG_BLK_DEV_SD=y
# CONFIG_CHR_DEV_ST is not set
# CONFIG_CHR_DEV_OSST is not set
CONFIG_BLK_DEV_SR=y
# CONFIG_BLK_DEV_SR_VENDOR is not set
CONFIG_CHR_DEV_SG=y
# CONFIG_CHR_DEV_SCH is not set

#
# Some SCSI devices (e.g. CD jukebox) support multiple LUNs
#
# CONFIG_SCSI_MULTI_LUN is not set
# CONFIG_SCSI_CONSTANTS is not set
# CONFIG_SCSI_LOGGING is not set
# CONFIG_SCSI_SCAN_ASYNC is not set

#
# SCSI Transports
#
# CONFIG_SCSI_SPI_ATTRS is not set
# CONFIG_SCSI_FC_ATTRS is not set
# CONFIG_SCSI_ISCSI_ATTRS is not set
# CONFIG_SCSI_SAS_LIBSAS is not set
# CONFIG_SCSI_SRP_ATTRS is not set
# CONFIG_SCSI_LOWLEVEL is not set
CONFIG_ATA=y
# CONFIG_ATA_NONSTANDARD is not set
CONFIG_ATA_ACPI=y
# CONFIG_SATA_AHCI is not set
# CONFIG_SATA_SVW is not set
CONFIG_ATA_PIIX=y
# CONFIG_SATA_MV is not set
# CONFIG_SATA_NV is not set
# CONFIG_PDC_ADMA is not set
# CONFIG_SATA_QSTOR is not set
# CONFIG_SATA_PROMISE is not set
# CONFIG_SATA_SX4 is not set
# CONFIG_SATA_SIL is not set
# CONFIG_SATA_SIL24 is not set
# CONFIG_SATA_SIS is not set
# CONFIG_SATA_ULI is not set
# CONFIG_SATA_VIA is not set
# CONFIG_SATA_VITESSE is not set
# CONFIG_SATA_INIC162X is not set
# CONFIG_PATA_ACPI is not set
# CONFIG_PATA_ALI is not set
# CONFIG_PATA_AMD is not set
# CONFIG_PATA_ARTOP is not set
# CONFIG_PATA_ATIIXP is not set
# CONFIG_PATA_CMD640_PCI is not set
# CONFIG_PATA_CMD64X is not set
# CONFIG_PATA_CS5520 is not set
# CONFIG_PATA_CS5530 is not set
# CONFIG_PATA_CS5535 is not set
# CONFIG_PATA_CS5536 is not set
# CONFIG_PATA_CYPRESS is not set
# CONFIG_PATA_EFAR is not set
# CONFIG_ATA_GENERIC is not set
# CONFIG_PATA_HPT366 is not set
# CONFIG_PATA_HPT37X is not set
# CONFIG_PATA_HPT3X2N is not set
# CONFIG_PATA_HPT3X3 is not set
# CONFIG_PATA_IT821X is not set
# CONFIG_PATA_IT8213 is not set
CONFIG_PATA_JMICRON=y
# CONFIG_PATA_TRIFLEX is not set
# CONFIG_PATA_MARVELL is not set
# CONFIG_PATA_MPIIX is not set
# CONFIG_PATA_OLDPIIX is not set
# CONFIG_PATA_NETCELL is not set
# CONFIG_PATA_NINJA32 is not set
# CONFIG_PATA_NS87410 is not set
# CONFIG_PATA_NS87415 is not set
# CONFIG_PATA_OPTI is not set
# CONFIG_PATA_OPTIDMA is not set
# CONFIG_PATA_PDC_OLD is not set
# CONFIG_PATA_RADISYS is not set
# CONFIG_PATA_RZ1000 is not set
# CONFIG_PATA_SC1200 is not set
# CONFIG_PATA_SERVERWORKS is not set
# CONFIG_PATA_PDC2027X is not set
# CONFIG_PATA_SIL680 is not set
# CONFIG_PATA_SIS is not set
# CONFIG_PATA_VIA is not set
# CONFIG_PATA_WINBOND is not set
# CONFIG_MD is not set
# CONFIG_FUSION is not set

#
# IEEE 1394 (FireWire) support
#
# CONFIG_FIREWIRE is not set
# CONFIG_IEEE1394 is not set
# CONFIG_I2O is not set
# CONFIG_MACINTOSH_DRIVERS is not set
CONFIG_NETDEVICES=y
# CONFIG_NETDEVICES_MULTIQUEUE is not set
# CONFIG_DUMMY is not set
# CONFIG_BONDING is not set
# CONFIG_MACVLAN is not set
# CONFIG_EQUALIZER is not set
CONFIG_TUN=y
# CONFIG_VETH is not set
# CONFIG_NET_SB1000 is not set
# CONFIG_ARCNET is not set
# CONFIG_NET_ETHERNET is not set
CONFIG_NETDEV_1000=y
# CONFIG_ACENIC is not set
# CONFIG_DL2K is not set
# CONFIG_E1000 is not set
# CONFIG_E1000E is not set
# CONFIG_E1000E_ENABLED is not set
# CONFIG_IP1000 is not set
# CONFIG_IGB is not set
# CONFIG_NS83820 is not set
# CONFIG_HAMACHI is not set
# CONFIG_YELLOWFIN is not set
CONFIG_R8169=y
# CONFIG_R8169_NAPI is not set
# CONFIG_SIS190 is not set
# CONFIG_SKGE is not set
# CONFIG_SKY2 is not set
# CONFIG_SK98LIN is not set
# CONFIG_VIA_VELOCITY is not set
# CONFIG_TIGON3 is not set
# CONFIG_BNX2 is not set
# CONFIG_QLA3XXX is not set
# CONFIG_ATL1 is not set
# CONFIG_NETDEV_10000 is not set
# CONFIG_TR is not set

#
# Wireless LAN
#
# CONFIG_WLAN_PRE80211 is not set
# CONFIG_WLAN_80211 is not set

#
# USB Network Adapters
#
# CONFIG_USB_CATC is not set
# CONFIG_USB_KAWETH is not set
# CONFIG_USB_PEGASUS is not set
# CONFIG_USB_RTL8150 is not set
# CONFIG_USB_USBNET is not set
# CONFIG_WAN is not set
# CONFIG_FDDI is not set
# CONFIG_HIPPI is not set
# CONFIG_PPP is not set
# CONFIG_SLIP is not set
# CONFIG_NET_FC is not set
# CONFIG_NETCONSOLE is not set
# CONFIG_NETPOLL is not set
# CONFIG_NET_POLL_CONTROLLER is not set
# CONFIG_ISDN is not set
# CONFIG_PHONE is not set

#
# Input device support
#
CONFIG_INPUT=y
# CONFIG_INPUT_FF_MEMLESS is not set
# CONFIG_INPUT_POLLDEV is not set

#
# Userland interfaces
#
CONFIG_INPUT_MOUSEDEV=y
CONFIG_INPUT_MOUSEDEV_PSAUX=y
CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768
CONFIG_INPUT_JOYDEV=y
CONFIG_INPUT_EVDEV=y
# CONFIG_INPUT_EVBUG is not set

#
# Input Device Drivers
#
CONFIG_INPUT_KEYBOARD=y
CONFIG_KEYBOARD_ATKBD=y
# CONFIG_KEYBOARD_SUNKBD is not set
# CONFIG_KEYBOARD_LKKBD is not set
# CONFIG_KEYBOARD_XTKBD is not set
# CONFIG_KEYBOARD_NEWTON is not set
# CONFIG_KEYBOARD_STOWAWAY is not set
CONFIG_INPUT_MOUSE=y
# CONFIG_MOUSE_PS2 is not set
# CONFIG_MOUSE_SERIAL is not set
# CONFIG_MOUSE_APPLETOUCH is not set
# CONFIG_MOUSE_VSXXXAA is not set
CONFIG_INPUT_JOYSTICK=y
# CONFIG_JOYSTICK_ANALOG is not set
# CONFIG_JOYSTICK_A3D is not set
# CONFIG_JOYSTICK_ADI is not set
# CONFIG_JOYSTICK_COBRA is not set
# CONFIG_JOYSTICK_GF2K is not set
# CONFIG_JOYSTICK_GRIP is not set
# CONFIG_JOYSTICK_GRIP_MP is not set
# CONFIG_JOYSTICK_GUILLEMOT is not set
# CONFIG_JOYSTICK_INTERACT is not set
# CONFIG_JOYSTICK_SIDEWINDER is not set
# CONFIG_JOYSTICK_TMDC is not set
# CONFIG_JOYSTICK_IFORCE is not set
# CONFIG_JOYSTICK_WARRIOR is not set
# CONFIG_JOYSTICK_MAGELLAN is not set
# CONFIG_JOYSTICK_SPACEORB is not set
# CONFIG_JOYSTICK_SPACEBALL is not set
# CONFIG_JOYSTICK_STINGER is not set
# CONFIG_JOYSTICK_TWIDJOY is not set
# CONFIG_JOYSTICK_JOYDUMP is not set
# CONFIG_JOYSTICK_XPAD is not set
# CONFIG_INPUT_TABLET is not set
# CONFIG_INPUT_TOUCHSCREEN is not set
# CONFIG_INPUT_MISC is not set

#
# Hardware I/O ports
#
CONFIG_SERIO=y
CONFIG_SERIO_I8042=y
# CONFIG_SERIO_SERPORT is not set
# CONFIG_SERIO_CT82C710 is not set
# CONFIG_SERIO_PCIPS2 is not set
CONFIG_SERIO_LIBPS2=y
# CONFIG_SERIO_RAW is not set
# CONFIG_GAMEPORT is not set

#
# Character devices
#
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
# CONFIG_VT_HW_CONSOLE_BINDING is not set
# CONFIG_SERIAL_NONSTANDARD is not set
# CONFIG_NOZOMI is not set

#
# Serial drivers
#
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_FIX_EARLYCON_MEM=y
CONFIG_SERIAL_8250_PCI=y
CONFIG_SERIAL_8250_PNP=y
CONFIG_SERIAL_8250_NR_UARTS=4
CONFIG_SERIAL_8250_RUNTIME_UARTS=4
# CONFIG_SERIAL_8250_EXTENDED is not set

#
# Non-8250 serial port support
#
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
# CONFIG_SERIAL_JSM is not set
CONFIG_UNIX98_PTYS=y
CONFIG_LEGACY_PTYS=y
CONFIG_LEGACY_PTY_COUNT=256
# CONFIG_IPMI_HANDLER is not set
# CONFIG_HW_RANDOM is not set
# CONFIG_NVRAM is not set
CONFIG_RTC=y
# CONFIG_R3964 is not set
# CONFIG_APPLICOM is not set
# CONFIG_SONYPI is not set
# CONFIG_MWAVE is not set
# CONFIG_PC8736x_GPIO is not set
# CONFIG_NSC_GPIO is not set
# CONFIG_CS5535_GPIO is not set
# CONFIG_RAW_DRIVER is not set
CONFIG_HPET=y
# CONFIG_HPET_RTC_IRQ is not set
CONFIG_HPET_MMAP=y
CONFIG_HANGCHECK_TIMER=y
# CONFIG_TCG_TPM is not set
# CONFIG_TELCLOCK is not set
CONFIG_DEVPORT=y
# CONFIG_I2C is not set

#
# SPI support
#
# CONFIG_SPI is not set
# CONFIG_SPI_MASTER is not set
# CONFIG_W1 is not set
CONFIG_POWER_SUPPLY=y
# CONFIG_POWER_SUPPLY_DEBUG is not set
# CONFIG_PDA_POWER is not set
# CONFIG_BATTERY_DS2760 is not set
CONFIG_HWMON=y
# CONFIG_HWMON_VID is not set
# CONFIG_SENSORS_ABITUGURU is not set
# CONFIG_SENSORS_ABITUGURU3 is not set
# CONFIG_SENSORS_K8TEMP is not set
# CONFIG_SENSORS_I5K_AMB is not set
# CONFIG_SENSORS_F71805F is not set
# CONFIG_SENSORS_F71882FG is not set
CONFIG_SENSORS_CORETEMP=y
# CONFIG_SENSORS_IT87 is not set
# CONFIG_SENSORS_PC87360 is not set
# CONFIG_SENSORS_PC87427 is not set
# CONFIG_SENSORS_SIS5595 is not set
# CONFIG_SENSORS_SMSC47M1 is not set
# CONFIG_SENSORS_SMSC47B397 is not set
# CONFIG_SENSORS_VIA686A is not set
# CONFIG_SENSORS_VT1211 is not set
# CONFIG_SENSORS_VT8231 is not set
# CONFIG_SENSORS_W83627HF is not set
# CONFIG_SENSORS_W83627EHF is not set
# CONFIG_SENSORS_HDAPS is not set
# CONFIG_SENSORS_APPLESMC is not set
# CONFIG_HWMON_DEBUG_CHIP is not set
CONFIG_THERMAL=y
# CONFIG_WATCHDOG is not set

#
# Sonics Silicon Backplane
#
CONFIG_SSB_POSSIBLE=y
# CONFIG_SSB is not set

#
# Multifunction device drivers
#
# CONFIG_MFD_SM501 is not set

#
# Multimedia devices
#
# CONFIG_VIDEO_DEV is not set
# CONFIG_DVB_CORE is not set
# CONFIG_DAB is not set

#
# Graphics support
#
CONFIG_AGP=y
# CONFIG_AGP_ALI is not set
# CONFIG_AGP_ATI is not set
# CONFIG_AGP_AMD is not set
# CONFIG_AGP_AMD64 is not set
# CONFIG_AGP_INTEL is not set
# CONFIG_AGP_NVIDIA is not set
# CONFIG_AGP_SIS is not set
# CONFIG_AGP_SWORKS is not set
# CONFIG_AGP_VIA is not set
# CONFIG_AGP_EFFICEON is not set
CONFIG_DRM=y
# CONFIG_DRM_TDFX is not set
# CONFIG_DRM_R128 is not set
CONFIG_DRM_RADEON=y
# CONFIG_DRM_MGA is not set
# CONFIG_DRM_SIS is not set
# CONFIG_DRM_VIA is not set
# CONFIG_DRM_SAVAGE is not set
# CONFIG_VGASTATE is not set
# CONFIG_VIDEO_OUTPUT_CONTROL is not set
# CONFIG_FB is not set
# CONFIG_BACKLIGHT_LCD_SUPPORT is not set

#
# Display device support
#
# CONFIG_DISPLAY_SUPPORT is not set

#
# Console display driver support
#
CONFIG_VGA_CONSOLE=y
CONFIG_VGACON_SOFT_SCROLLBACK=y
CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=128
# CONFIG_VIDEO_SELECT is not set
CONFIG_DUMMY_CONSOLE=y

#
# Sound
#
CONFIG_SOUND=y

#
# Advanced Linux Sound Architecture
#
CONFIG_SND=y
CONFIG_SND_TIMER=y
CONFIG_SND_PCM=y
# CONFIG_SND_SEQUENCER is not set
CONFIG_SND_OSSEMUL=y
CONFIG_SND_MIXER_OSS=y
CONFIG_SND_PCM_OSS=y
CONFIG_SND_PCM_OSS_PLUGINS=y
# CONFIG_SND_RTCTIMER is not set
# CONFIG_SND_DYNAMIC_MINORS is not set
# CONFIG_SND_SUPPORT_OLD_API is not set
CONFIG_SND_VERBOSE_PROCFS=y
# CONFIG_SND_VERBOSE_PRINTK is not set
# CONFIG_SND_DEBUG is not set

#
# Generic devices
#
# CONFIG_SND_DUMMY is not set
# CONFIG_SND_MTPAV is not set
# CONFIG_SND_SERIAL_U16550 is not set
# CONFIG_SND_MPU401 is not set

#
# PCI devices
#
# CONFIG_SND_AD1889 is not set
# CONFIG_SND_ALS300 is not set
# CONFIG_SND_ALS4000 is not set
# CONFIG_SND_ALI5451 is not set
# CONFIG_SND_ATIIXP is not set
# CONFIG_SND_ATIIXP_MODEM is not set
# CONFIG_SND_AU8810 is not set
# CONFIG_SND_AU8820 is not set
# CONFIG_SND_AU8830 is not set
# CONFIG_SND_AZT3328 is not set
# CONFIG_SND_BT87X is not set
# CONFIG_SND_CA0106 is not set
# CONFIG_SND_CMIPCI is not set
# CONFIG_SND_OXYGEN is not set
# CONFIG_SND_CS4281 is not set
# CONFIG_SND_CS46XX is not set
# CONFIG_SND_CS5530 is not set
# CONFIG_SND_CS5535AUDIO is not set
# CONFIG_SND_DARLA20 is not set
# CONFIG_SND_GINA20 is not set
# CONFIG_SND_LAYLA20 is not set
# CONFIG_SND_DARLA24 is not set
# CONFIG_SND_GINA24 is not set
# CONFIG_SND_LAYLA24 is not set
# CONFIG_SND_MONA is not set
# CONFIG_SND_MIA is not set
# CONFIG_SND_ECHO3G is not set
# CONFIG_SND_INDIGO is not set
# CONFIG_SND_INDIGOIO is not set
# CONFIG_SND_INDIGODJ is not set
# CONFIG_SND_EMU10K1 is not set
# CONFIG_SND_EMU10K1X is not set
# CONFIG_SND_ENS1370 is not set
# CONFIG_SND_ENS1371 is not set
# CONFIG_SND_ES1938 is not set
# CONFIG_SND_ES1968 is not set
# CONFIG_SND_FM801 is not set
CONFIG_SND_HDA_INTEL=y
# CONFIG_SND_HDA_HWDEP is not set
CONFIG_SND_HDA_CODEC_REALTEK=y
CONFIG_SND_HDA_CODEC_ANALOG=y
CONFIG_SND_HDA_CODEC_SIGMATEL=y
CONFIG_SND_HDA_CODEC_VIA=y
CONFIG_SND_HDA_CODEC_ATIHDMI=y
CONFIG_SND_HDA_CODEC_CONEXANT=y
CONFIG_SND_HDA_CODEC_CMEDIA=y
CONFIG_SND_HDA_CODEC_SI3054=y
CONFIG_SND_HDA_GENERIC=y
# CONFIG_SND_HDA_POWER_SAVE is not set
# CONFIG_SND_HDSP is not set
# CONFIG_SND_HDSPM is not set
# CONFIG_SND_HIFIER is not set
# CONFIG_SND_ICE1712 is not set
# CONFIG_SND_ICE1724 is not set
# CONFIG_SND_INTEL8X0 is not set
# CONFIG_SND_INTEL8X0M is not set
# CONFIG_SND_KORG1212 is not set
# CONFIG_SND_MAESTRO3 is not set
# CONFIG_SND_MIXART is not set
# CONFIG_SND_NM256 is not set
# CONFIG_SND_PCXHR is not set
# CONFIG_SND_RIPTIDE is not set
# CONFIG_SND_RME32 is not set
# CONFIG_SND_RME96 is not set
# CONFIG_SND_RME9652 is not set
# CONFIG_SND_SIS7019 is not set
# CONFIG_SND_SONICVIBES is not set
# CONFIG_SND_TRIDENT is not set
# CONFIG_SND_VIA82XX is not set
# CONFIG_SND_VIA82XX_MODEM is not set
# CONFIG_SND_VIRTUOSO is not set
# CONFIG_SND_VX222 is not set
# CONFIG_SND_YMFPCI is not set

#
# USB devices
#
# CONFIG_SND_USB_AUDIO is not set
# CONFIG_SND_USB_USX2Y is not set
# CONFIG_SND_USB_CAIAQ is not set

#
# System on Chip audio support
#
# CONFIG_SND_SOC is not set

#
# SoC Audio support for SuperH
#

#
# ALSA SoC audio for Freescale SOCs
#

#
# Open Sound System
#
# CONFIG_SOUND_PRIME is not set
CONFIG_HID_SUPPORT=y
CONFIG_HID=y
# CONFIG_HID_DEBUG is not set
# CONFIG_HIDRAW is not set

#
# USB Input Devices
#
CONFIG_USB_HID=y
# CONFIG_USB_HIDINPUT_POWERBOOK is not set
# CONFIG_HID_FF is not set
# CONFIG_USB_HIDDEV is not set
CONFIG_USB_SUPPORT=y
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB_ARCH_HAS_OHCI=y
CONFIG_USB_ARCH_HAS_EHCI=y
CONFIG_USB=y
# CONFIG_USB_DEBUG is not set
# CONFIG_USB_ANNOUNCE_NEW_DEVICES is not set

#
# Miscellaneous USB options
#
CONFIG_USB_DEVICEFS=y
# CONFIG_USB_DEVICE_CLASS is not set
# CONFIG_USB_DYNAMIC_MINORS is not set
# CONFIG_USB_SUSPEND is not set
# CONFIG_USB_PERSIST is not set
# CONFIG_USB_OTG is not set

#
# USB Host Controller Drivers
#
CONFIG_USB_EHCI_HCD=y
# CONFIG_USB_EHCI_ROOT_HUB_TT is not set
# CONFIG_USB_EHCI_TT_NEWSCHED is not set
# CONFIG_USB_ISP116X_HCD is not set
CONFIG_USB_OHCI_HCD=y
# CONFIG_USB_OHCI_BIG_ENDIAN_DESC is not set
# CONFIG_USB_OHCI_BIG_ENDIAN_MMIO is not set
CONFIG_USB_OHCI_LITTLE_ENDIAN=y
CONFIG_USB_UHCI_HCD=y
# CONFIG_USB_SL811_HCD is not set
# CONFIG_USB_R8A66597_HCD is not set

#
# USB Device Class drivers
#
# CONFIG_USB_ACM is not set
# CONFIG_USB_PRINTER is not set

#
# NOTE: USB_STORAGE enables SCSI, and 'SCSI disk support'
#

#
# may also be needed; see USB_STORAGE Help for more information
#
CONFIG_USB_STORAGE=y
# CONFIG_USB_STORAGE_DEBUG is not set
# CONFIG_USB_STORAGE_DATAFAB is not set
# CONFIG_USB_STORAGE_FREECOM is not set
# CONFIG_USB_STORAGE_ISD200 is not set
# CONFIG_USB_STORAGE_DPCM is not set
# CONFIG_USB_STORAGE_USBAT is not set
# CONFIG_USB_STORAGE_SDDR09 is not set
# CONFIG_USB_STORAGE_SDDR55 is not set
# CONFIG_USB_STORAGE_JUMPSHOT is not set
# CONFIG_USB_STORAGE_ALAUDA is not set
# CONFIG_USB_STORAGE_KARMA is not set
# CONFIG_USB_LIBUSUAL is not set

#
# USB Imaging devices
#
# CONFIG_USB_MDC800 is not set
# CONFIG_USB_MICROTEK is not set
# CONFIG_USB_MON is not set

#
# USB port drivers
#
# CONFIG_USB_SERIAL is not set

#
# USB Miscellaneous drivers
#
# CONFIG_USB_EMI62 is not set
# CONFIG_USB_EMI26 is not set
# CONFIG_USB_ADUTUX is not set
# CONFIG_USB_AUERSWALD is not set
# CONFIG_USB_RIO500 is not set
# CONFIG_USB_LEGOTOWER is not set
# CONFIG_USB_LCD is not set
# CONFIG_USB_BERRY_CHARGE is not set
# CONFIG_USB_LED is not set
# CONFIG_USB_CYPRESS_CY7C63 is not set
# CONFIG_USB_CYTHERM is not set
# CONFIG_USB_PHIDGET is not set
# CONFIG_USB_IDMOUSE is not set
# CONFIG_USB_FTDI_ELAN is not set
# CONFIG_USB_APPLEDISPLAY is not set
# CONFIG_USB_SISUSBVGA is not set
# CONFIG_USB_LD is not set
# CONFIG_USB_TRANCEVIBRATOR is not set
# CONFIG_USB_IOWARRIOR is not set
# CONFIG_USB_TEST is not set
# CONFIG_USB_GADGET is not set
# CONFIG_MMC is not set
# CONFIG_MEMSTICK is not set
# CONFIG_NEW_LEDS is not set
# CONFIG_INFINIBAND is not set
# CONFIG_EDAC is not set
# CONFIG_RTC_CLASS is not set
# CONFIG_DMADEVICES is not set

#
# Userspace I/O
#
# CONFIG_UIO is not set

#
# Firmware Drivers
#
# CONFIG_EDD is not set
# CONFIG_DELL_RBU is not set
# CONFIG_DCDBAS is not set
# CONFIG_DMIID is not set

#
# File systems
#
CONFIG_EXT2_FS=y
CONFIG_EXT2_FS_XATTR=y
CONFIG_EXT2_FS_POSIX_ACL=y
# CONFIG_EXT2_FS_SECURITY is not set
# CONFIG_EXT2_FS_XIP is not set
CONFIG_EXT3_FS=y
CONFIG_EXT3_FS_XATTR=y
CONFIG_EXT3_FS_POSIX_ACL=y
# CONFIG_EXT3_FS_SECURITY is not set
# CONFIG_EXT4DEV_FS is not set
CONFIG_JBD=y
CONFIG_FS_MBCACHE=y
CONFIG_REISER4_FS=y
# CONFIG_REISER4_DEBUG is not set
# CONFIG_REISERFS_FS is not set
# CONFIG_JFS_FS is not set
CONFIG_FS_POSIX_ACL=y
# CONFIG_XFS_FS is not set
# CONFIG_GFS2_FS is not set
# CONFIG_OCFS2_FS is not set
CONFIG_DNOTIFY=y
CONFIG_INOTIFY=y
CONFIG_INOTIFY_USER=y
# CONFIG_QUOTA is not set
# CONFIG_AUTOFS_FS is not set
CONFIG_AUTOFS4_FS=y
# CONFIG_FUSE_FS is not set

#
# CD-ROM/DVD Filesystems
#
CONFIG_ISO9660_FS=y
CONFIG_JOLIET=y
# CONFIG_ZISOFS is not set
CONFIG_UDF_FS=y
CONFIG_UDF_NLS=y

#
# DOS/FAT/NT Filesystems
#
CONFIG_FAT_FS=y
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_FAT_DEFAULT_CODEPAGE=437
CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
CONFIG_NTFS_FS=y
# CONFIG_NTFS_DEBUG is not set
CONFIG_NTFS_RW=y

#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
CONFIG_PROC_SYSCTL=y
CONFIG_SYSFS=y
CONFIG_TMPFS=y
# CONFIG_TMPFS_POSIX_ACL is not set
# CONFIG_HUGETLBFS is not set
# CONFIG_HUGETLB_PAGE is not set
# CONFIG_CONFIGFS_FS is not set

#
# Miscellaneous filesystems
#
# CONFIG_ADFS_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_HFSPLUS_FS is not set
# CONFIG_BEFS_FS is not set
# CONFIG_BFS_FS is not set
# CONFIG_EFS_FS is not set
# CONFIG_CRAMFS is not set
# CONFIG_SQUASHFS is not set
# CONFIG_VXFS_FS is not set
# CONFIG_MINIX_FS is not set
# CONFIG_HPFS_FS is not set
# CONFIG_QNX4FS_FS is not set
# CONFIG_ROMFS_FS is not set
# CONFIG_SYSV_FS is not set
# CONFIG_UFS_FS is not set
CONFIG_NETWORK_FILESYSTEMS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
# CONFIG_NFS_V3_ACL is not set
# CONFIG_NFS_V4 is not set
# CONFIG_NFS_DIRECTIO is not set
CONFIG_NFSD=y
CONFIG_NFSD_V3=y
# CONFIG_NFSD_V3_ACL is not set
# CONFIG_NFSD_V4 is not set
CONFIG_NFSD_TCP=y
CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
CONFIG_EXPORTFS=y
CONFIG_NFS_COMMON=y
CONFIG_SUNRPC=y
# CONFIG_SUNRPC_BIND34 is not set
# CONFIG_RPCSEC_GSS_KRB5 is not set
# CONFIG_RPCSEC_GSS_SPKM3 is not set
# CONFIG_SMB_FS is not set
CONFIG_CIFS=y
# CONFIG_CIFS_STATS is not set
# CONFIG_CIFS_WEAK_PW_HASH is not set
# CONFIG_CIFS_XATTR is not set
# CONFIG_CIFS_DEBUG2 is not set
# CONFIG_CIFS_EXPERIMENTAL is not set
# CONFIG_NCP_FS is not set
# CONFIG_CODA_FS is not set
# CONFIG_AFS_FS is not set

#
# Partition Types
#
# CONFIG_PARTITION_ADVANCED is not set
CONFIG_MSDOS_PARTITION=y
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=y
# CONFIG_NLS_CODEPAGE_737 is not set
# CONFIG_NLS_CODEPAGE_775 is not set
# CONFIG_NLS_CODEPAGE_850 is not set
# CONFIG_NLS_CODEPAGE_852 is not set
# CONFIG_NLS_CODEPAGE_855 is not set
# CONFIG_NLS_CODEPAGE_857 is not set
# CONFIG_NLS_CODEPAGE_860 is not set
# CONFIG_NLS_CODEPAGE_861 is not set
# CONFIG_NLS_CODEPAGE_862 is not set
# CONFIG_NLS_CODEPAGE_863 is not set
# CONFIG_NLS_CODEPAGE_864 is not set
# CONFIG_NLS_CODEPAGE_865 is not set
# CONFIG_NLS_CODEPAGE_866 is not set
# CONFIG_NLS_CODEPAGE_869 is not set
# CONFIG_NLS_CODEPAGE_936 is not set
# CONFIG_NLS_CODEPAGE_950 is not set
# CONFIG_NLS_CODEPAGE_932 is not set
# CONFIG_NLS_CODEPAGE_949 is not set
# CONFIG_NLS_CODEPAGE_874 is not set
# CONFIG_NLS_ISO8859_8 is not set
# CONFIG_NLS_CODEPAGE_1250 is not set
# CONFIG_NLS_CODEPAGE_1251 is not set
CONFIG_NLS_ASCII=y
CONFIG_NLS_ISO8859_1=y
# CONFIG_NLS_ISO8859_2 is not set
# CONFIG_NLS_ISO8859_3 is not set
# CONFIG_NLS_ISO8859_4 is not set
# CONFIG_NLS_ISO8859_5 is not set
# CONFIG_NLS_ISO8859_6 is not set
# CONFIG_NLS_ISO8859_7 is not set
# CONFIG_NLS_ISO8859_9 is not set
# CONFIG_NLS_ISO8859_13 is not set
# CONFIG_NLS_ISO8859_14 is not set
CONFIG_NLS_ISO8859_15=y
# CONFIG_NLS_KOI8_R is not set
# CONFIG_NLS_KOI8_U is not set
CONFIG_NLS_UTF8=y
# CONFIG_DLM is not set

#
# Kernel hacking
#
CONFIG_TRACE_IRQFLAGS_SUPPORT=y
# CONFIG_PRINTK_TIME is not set
CONFIG_ENABLE_WARN_DEPRECATED=y
CONFIG_ENABLE_MUST_CHECK=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_UNUSED_SYMBOLS=y
# CONFIG_DEBUG_FS is not set
# CONFIG_HEADERS_CHECK is not set
CONFIG_DEBUG_KERNEL=y
# CONFIG_DEBUG_SHIRQ is not set
CONFIG_DETECT_SOFTLOCKUP=y
CONFIG_SCHED_DEBUG=y
# CONFIG_SCHEDSTATS is not set
# CONFIG_TIMER_STATS is not set
# CONFIG_DEBUG_SLAB is not set
# CONFIG_DEBUG_RT_MUTEXES is not set
# CONFIG_RT_MUTEX_TESTER is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_MUTEXES is not set
# CONFIG_DEBUG_LOCK_ALLOC is not set
# CONFIG_PROVE_LOCKING is not set
# CONFIG_LOCK_STAT is not set
# CONFIG_DEBUG_SPINLOCK_SLEEP is not set
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
# CONFIG_DEBUG_KOBJECT is not set
# CONFIG_DEBUG_HIGHMEM is not set
CONFIG_DEBUG_BUGVERBOSE=y
# CONFIG_DEBUG_INFO is not set
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_LIST is not set
# CONFIG_DEBUG_SG is not set
# CONFIG_FRAME_POINTER is not set
# CONFIG_BOOT_PRINTK_DELAY is not set
# CONFIG_BACKTRACE_SELF_TEST is not set
# CONFIG_FAULT_INJECTION is not set
# CONFIG_LATENCYTOP is not set
# CONFIG_PROVIDE_OHCI1394_DMA_INIT is not set
# CONFIG_SAMPLES is not set
CONFIG_EARLY_PRINTK=y
CONFIG_DEBUG_STACKOVERFLOW=y
# CONFIG_DEBUG_STACK_USAGE is not set
# CONFIG_DEBUG_PAGEALLOC is not set
# CONFIG_DEBUG_RODATA is not set
CONFIG_4KSTACKS=y
CONFIG_X86_FIND_SMP_CONFIG=y
CONFIG_X86_MPPARSE=y
CONFIG_DOUBLEFAULT=y
CONFIG_IO_DELAY_TYPE_0X80=0
CONFIG_IO_DELAY_TYPE_0XED=1
CONFIG_IO_DELAY_TYPE_UDELAY=2
CONFIG_IO_DELAY_TYPE_NONE=3
CONFIG_IO_DELAY_0X80=y
# CONFIG_IO_DELAY_0XED is not set
# CONFIG_IO_DELAY_UDELAY is not set
# CONFIG_IO_DELAY_NONE is not set
CONFIG_DEFAULT_IO_DELAY_TYPE=0
# CONFIG_CPA_DEBUG is not set

#
# Security options
#
# CONFIG_KEYS is not set
# CONFIG_SECURITY is not set
# CONFIG_SECURITY_FILE_CAPABILITIES is not set
CONFIG_CRYPTO=y
CONFIG_CRYPTO_ALGAPI=y
CONFIG_CRYPTO_BLKCIPHER=y
# CONFIG_CRYPTO_SEQIV is not set
CONFIG_CRYPTO_MANAGER=y
# CONFIG_CRYPTO_HMAC is not set
# CONFIG_CRYPTO_XCBC is not set
# CONFIG_CRYPTO_NULL is not set
# CONFIG_CRYPTO_MD4 is not set
# CONFIG_CRYPTO_MD5 is not set
CONFIG_CRYPTO_SHA1=y
CONFIG_CRYPTO_SHA256=y
# CONFIG_CRYPTO_SHA512 is not set
# CONFIG_CRYPTO_WP512 is not set
# CONFIG_CRYPTO_TGR192 is not set
# CONFIG_CRYPTO_GF128MUL is not set
CONFIG_CRYPTO_ECB=y
CONFIG_CRYPTO_CBC=y
CONFIG_CRYPTO_PCBC=y
# CONFIG_CRYPTO_LRW is not set
# CONFIG_CRYPTO_XTS is not set
# CONFIG_CRYPTO_CTR is not set
# CONFIG_CRYPTO_GCM is not set
# CONFIG_CRYPTO_CCM is not set
# CONFIG_CRYPTO_CRYPTD is not set
# CONFIG_CRYPTO_DES is not set
# CONFIG_CRYPTO_FCRYPT is not set
# CONFIG_CRYPTO_BLOWFISH is not set
# CONFIG_CRYPTO_TWOFISH is not set
# CONFIG_CRYPTO_TWOFISH_586 is not set
# CONFIG_CRYPTO_SERPENT is not set
# CONFIG_CRYPTO_AES is not set
# CONFIG_CRYPTO_AES_586 is not set
# CONFIG_CRYPTO_CAST5 is not set
# CONFIG_CRYPTO_CAST6 is not set
# CONFIG_CRYPTO_TEA is not set
# CONFIG_CRYPTO_ARC4 is not set
# CONFIG_CRYPTO_KHAZAD is not set
# CONFIG_CRYPTO_ANUBIS is not set
# CONFIG_CRYPTO_SEED is not set
# CONFIG_CRYPTO_SALSA20 is not set
# CONFIG_CRYPTO_SALSA20_586 is not set
# CONFIG_CRYPTO_DEFLATE is not set
# CONFIG_CRYPTO_MICHAEL_MIC is not set
# CONFIG_CRYPTO_CRC32C is not set
# CONFIG_CRYPTO_CAMELLIA is not set
# CONFIG_CRYPTO_AUTHENC is not set
# CONFIG_CRYPTO_LZO is not set
# CONFIG_CRYPTO_HW is not set
CONFIG_HAVE_KVM=y
# CONFIG_VIRTUALIZATION is not set

#
# Library routines
#
CONFIG_BITREVERSE=y
# CONFIG_CRC_CCITT is not set
# CONFIG_CRC16 is not set
# CONFIG_CRC_ITU_T is not set
CONFIG_CRC32=y
# CONFIG_CRC7 is not set
# CONFIG_LIBCRC32C is not set
CONFIG_ZLIB_INFLATE=y
CONFIG_ZLIB_DEFLATE=y
CONFIG_LZO_COMPRESS=y
CONFIG_LZO_DECOMPRESS=y
CONFIG_PLIST=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT=y
CONFIG_HAS_DMA=y