* [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies
@ 2013-09-04 11:47 Vineet Gupta
2013-09-05 18:25 ` David Miller
0 siblings, 1 reply; 7+ messages in thread
From: Vineet Gupta @ 2013-09-04 11:47 UTC (permalink / raw)
To: netdev
Cc: Vineet Gupta, Alexey Brodkin, David S. Miller, linux-kernel,
arc-linux-dev
copying large files to a NFS mounted host was taking absurdly large
time.
Turns out that TX BD reclaim had a sublte bug.
Loop starts off from @txbd_dirty cursor and stops when it hits a BD
still in use by controller. However when it stops it needs to keep the
cursor at that very BD to resume scanning in next iteration. However it
was erroneously incrementing the cursor, causing the next scan(s) to
fail too, unless the BD chain was completely drained out.
[ARCLinux]$ ls -l -sh /disk/log.txt
17976 -rw-r--r-- 1 root root 17.5M Sep /disk/log.txt
========== Before =====================
[ARCLinux]$ time cp /disk/log.txt /mnt/.
real 31m 7.95s
user 0m 0.00s
sys 0m 0.10s
========== After =====================
[ARCLinux]$ time cp /disk/log.txt /mnt/.
real 0m 24.33s
user 0m 0.00s
sys 0m 0.19s
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com> (commit_signer:3/4=75%)
Cc: "David S. Miller" <davem@davemloft.net> (commit_signer:3/4=75%)
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: arc-linux-dev@synopsys.com
---
drivers/net/ethernet/arc/emac_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index 55d79cb..9e16014 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -149,8 +149,6 @@ static void arc_emac_tx_clean(struct net_device *ndev)
struct sk_buff *skb = tx_buff->skb;
unsigned int info = le32_to_cpu(txbd->info);
- *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
-
if ((info & FOR_EMAC) || !txbd->data)
break;
@@ -180,6 +178,8 @@ static void arc_emac_tx_clean(struct net_device *ndev)
txbd->data = 0;
txbd->info = 0;
+ *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
+
if (netif_queue_stopped(ndev))
netif_wake_queue(ndev);
}
--
1.8.1.2
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies
2013-09-04 11:47 [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies Vineet Gupta
@ 2013-09-05 18:25 ` David Miller
2013-09-10 6:27 ` Vineet Gupta
0 siblings, 1 reply; 7+ messages in thread
From: David Miller @ 2013-09-05 18:25 UTC (permalink / raw)
To: Vineet.Gupta1; +Cc: netdev, Alexey.Brodkin, linux-kernel, arc-linux-dev
From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Date: Wed, 4 Sep 2013 17:17:15 +0530
> copying large files to a NFS mounted host was taking absurdly large
> time.
>
> Turns out that TX BD reclaim had a sublte bug.
>
> Loop starts off from @txbd_dirty cursor and stops when it hits a BD
> still in use by controller. However when it stops it needs to keep the
> cursor at that very BD to resume scanning in next iteration. However it
> was erroneously incrementing the cursor, causing the next scan(s) to
> fail too, unless the BD chain was completely drained out.
>
> [ARCLinux]$ ls -l -sh /disk/log.txt
> 17976 -rw-r--r-- 1 root root 17.5M Sep /disk/log.txt
>
> ========== Before =====================
> [ARCLinux]$ time cp /disk/log.txt /mnt/.
> real 31m 7.95s
> user 0m 0.00s
> sys 0m 0.10s
>
> ========== After =====================
> [ARCLinux]$ time cp /disk/log.txt /mnt/.
> real 0m 24.33s
> user 0m 0.00s
> sys 0m 0.19s
>
> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Applied.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies
2013-09-05 18:25 ` David Miller
@ 2013-09-10 6:27 ` Vineet Gupta
2013-09-16 5:43 ` Vineet Gupta
0 siblings, 1 reply; 7+ messages in thread
From: Vineet Gupta @ 2013-09-10 6:27 UTC (permalink / raw)
To: greg Kroah-Hartman
Cc: David Miller, netdev, Alexey.Brodkin, linux-kernel,
arc-linux-dev, stable
On 09/05/2013 11:55 PM, David Miller wrote:
> From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
> Date: Wed, 4 Sep 2013 17:17:15 +0530
>
>> copying large files to a NFS mounted host was taking absurdly large
>> time.
>>
>> Turns out that TX BD reclaim had a sublte bug.
>>
>> Loop starts off from @txbd_dirty cursor and stops when it hits a BD
>> still in use by controller. However when it stops it needs to keep the
>> cursor at that very BD to resume scanning in next iteration. However it
>> was erroneously incrementing the cursor, causing the next scan(s) to
>> fail too, unless the BD chain was completely drained out.
>>
>> [ARCLinux]$ ls -l -sh /disk/log.txt
>> 17976 -rw-r--r-- 1 root root 17.5M Sep /disk/log.txt
>>
>> ========== Before =====================
>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
>> real 31m 7.95s
>> user 0m 0.00s
>> sys 0m 0.10s
>>
>> ========== After =====================
>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
>> real 0m 24.33s
>> user 0m 0.00s
>> sys 0m 0.19s
>>
>> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
>
> Applied.
>
Hi Greg,
This needs a stable backport (3.11).
Mainline commit 27082ee1b92f4d41e78b85
Thx,
-Vineet
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies
2013-09-10 6:27 ` Vineet Gupta
@ 2013-09-16 5:43 ` Vineet Gupta
2013-09-16 19:40 ` greg Kroah-Hartman
0 siblings, 1 reply; 7+ messages in thread
From: Vineet Gupta @ 2013-09-16 5:43 UTC (permalink / raw)
To: greg Kroah-Hartman
Cc: David Miller, netdev, Alexey.Brodkin, linux-kernel, stable
On 09/10/2013 11:57 AM, Vineet Gupta wrote:
> On 09/05/2013 11:55 PM, David Miller wrote:
>> From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
>> Date: Wed, 4 Sep 2013 17:17:15 +0530
>>
>>> copying large files to a NFS mounted host was taking absurdly large
>>> time.
>>>
>>> Turns out that TX BD reclaim had a sublte bug.
>>>
>>> Loop starts off from @txbd_dirty cursor and stops when it hits a BD
>>> still in use by controller. However when it stops it needs to keep the
>>> cursor at that very BD to resume scanning in next iteration. However it
>>> was erroneously incrementing the cursor, causing the next scan(s) to
>>> fail too, unless the BD chain was completely drained out.
>>>
>>> [ARCLinux]$ ls -l -sh /disk/log.txt
>>> 17976 -rw-r--r-- 1 root root 17.5M Sep /disk/log.txt
>>>
>>> ========== Before =====================
>>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
>>> real 31m 7.95s
>>> user 0m 0.00s
>>> sys 0m 0.10s
>>>
>>> ========== After =====================
>>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
>>> real 0m 24.33s
>>> user 0m 0.00s
>>> sys 0m 0.19s
>>>
>>> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
>>
>> Applied.
>>
>
> Hi Greg,
>
> This needs a stable backport (3.11).
> Mainline commit 27082ee1b92f4d41e78b85
>
> Thx,
> -Vineet
Hi Greg,
I didn't spot this one in your stable-queue for 3.11.
Please apply.
Thx,
Vineet
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies
2013-09-16 5:43 ` Vineet Gupta
@ 2013-09-16 19:40 ` greg Kroah-Hartman
2013-09-17 4:07 ` Vineet Gupta
0 siblings, 1 reply; 7+ messages in thread
From: greg Kroah-Hartman @ 2013-09-16 19:40 UTC (permalink / raw)
To: Vineet Gupta; +Cc: David Miller, netdev, Alexey.Brodkin, linux-kernel, stable
On Mon, Sep 16, 2013 at 11:13:48AM +0530, Vineet Gupta wrote:
> On 09/10/2013 11:57 AM, Vineet Gupta wrote:
> > On 09/05/2013 11:55 PM, David Miller wrote:
> >> From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
> >> Date: Wed, 4 Sep 2013 17:17:15 +0530
> >>
> >>> copying large files to a NFS mounted host was taking absurdly large
> >>> time.
> >>>
> >>> Turns out that TX BD reclaim had a sublte bug.
> >>>
> >>> Loop starts off from @txbd_dirty cursor and stops when it hits a BD
> >>> still in use by controller. However when it stops it needs to keep the
> >>> cursor at that very BD to resume scanning in next iteration. However it
> >>> was erroneously incrementing the cursor, causing the next scan(s) to
> >>> fail too, unless the BD chain was completely drained out.
> >>>
> >>> [ARCLinux]$ ls -l -sh /disk/log.txt
> >>> 17976 -rw-r--r-- 1 root root 17.5M Sep /disk/log.txt
> >>>
> >>> ========== Before =====================
> >>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
> >>> real 31m 7.95s
> >>> user 0m 0.00s
> >>> sys 0m 0.10s
> >>>
> >>> ========== After =====================
> >>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
> >>> real 0m 24.33s
> >>> user 0m 0.00s
> >>> sys 0m 0.19s
> >>>
> >>> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
> >>
> >> Applied.
> >>
> >
> > Hi Greg,
> >
> > This needs a stable backport (3.11).
> > Mainline commit 27082ee1b92f4d41e78b85
> >
> > Thx,
> > -Vineet
>
> Hi Greg,
>
> I didn't spot this one in your stable-queue for 3.11.
> Please apply.
Network patches for the stable tree needs to go through the networking
maintainer. Please let them know about this and they will forward it on
to me if needed.
thanks,
greg k-h
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies
2013-09-16 19:40 ` greg Kroah-Hartman
@ 2013-09-17 4:07 ` Vineet Gupta
2013-09-17 4:17 ` David Miller
0 siblings, 1 reply; 7+ messages in thread
From: Vineet Gupta @ 2013-09-17 4:07 UTC (permalink / raw)
To: David Miller
Cc: greg Kroah-Hartman, netdev, Alexey.Brodkin, linux-kernel, stable
On 09/17/2013 01:10 AM, greg Kroah-Hartman wrote:
> On Mon, Sep 16, 2013 at 11:13:48AM +0530, Vineet Gupta wrote:
>> On 09/10/2013 11:57 AM, Vineet Gupta wrote:
>>> On 09/05/2013 11:55 PM, David Miller wrote:
>>>> From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
>>>> Date: Wed, 4 Sep 2013 17:17:15 +0530
>>>>
>>>>> copying large files to a NFS mounted host was taking absurdly large
>>>>> time.
>>>>>
>>>>> Turns out that TX BD reclaim had a sublte bug.
>>>>>
>>>>> Loop starts off from @txbd_dirty cursor and stops when it hits a BD
>>>>> still in use by controller. However when it stops it needs to keep the
>>>>> cursor at that very BD to resume scanning in next iteration. However it
>>>>> was erroneously incrementing the cursor, causing the next scan(s) to
>>>>> fail too, unless the BD chain was completely drained out.
>>>>>
>>>>> [ARCLinux]$ ls -l -sh /disk/log.txt
>>>>> 17976 -rw-r--r-- 1 root root 17.5M Sep /disk/log.txt
>>>>>
>>>>> ========== Before =====================
>>>>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
>>>>> real 31m 7.95s
>>>>> user 0m 0.00s
>>>>> sys 0m 0.10s
>>>>>
>>>>> ========== After =====================
>>>>> [ARCLinux]$ time cp /disk/log.txt /mnt/.
>>>>> real 0m 24.33s
>>>>> user 0m 0.00s
>>>>> sys 0m 0.19s
>>>>>
>>>>> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
>>>> Applied.
>>>>
>>> Hi Greg,
>>>
>>> This needs a stable backport (3.11).
>>> Mainline commit 27082ee1b92f4d41e78b85
>>>
>>> Thx,
>>> -Vineet
>> Hi Greg,
>>
>> I didn't spot this one in your stable-queue for 3.11.
>> Please apply.
> Network patches for the stable tree needs to go through the networking
> maintainer. Please let them know about this and they will forward it on
> to me if needed.
>
> thanks,
>
> greg k-h
Hi David,
Can you please do the needful for stable 3.11 backport of this patch.
Thx,
-Vineet
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies
2013-09-17 4:07 ` Vineet Gupta
@ 2013-09-17 4:17 ` David Miller
0 siblings, 0 replies; 7+ messages in thread
From: David Miller @ 2013-09-17 4:17 UTC (permalink / raw)
To: Vineet.Gupta1; +Cc: gregkh, netdev, Alexey.Brodkin, linux-kernel, stable
From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Date: Tue, 17 Sep 2013 04:07:23 +0000
> Can you please do the needful for stable 3.11 backport of this patch.
Queued up for -stable.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2013-09-04 11:47 [PATCH] ethernet/arc/arc_emac: Fix huge delays in large file copies Vineet Gupta
2013-09-05 18:25 ` David Miller
2013-09-10 6:27 ` Vineet Gupta
2013-09-16 5:43 ` Vineet Gupta
2013-09-16 19:40 ` greg Kroah-Hartman
2013-09-17 4:07 ` Vineet Gupta
2013-09-17 4:17 ` David Miller
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