kernel (64bit) 4GB memory support

kernel (64bit) 4GB memory support

[Rudolf Usselmann]

Could anybody tell me which of the previous (non 2.6.9) kernels
do support 4GB of main memory in 64 bit mode ?

I'd appreciate a cc, as I am not a regular list reader.

Thanks !

rudi

Re: kernel (64bit) 4GB memory support

[Jeff Garzik]

Rudolf Usselmann wrote:
> Could anybody tell me which of the previous (non 2.6.9) kernels
> do support 4GB of main memory in 64 bit mode ?

64bit kernels have supported >4GB since their ports inception, AFAIK.

Your platform could limit this artificially, of course.

	Jeff

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Sat, 2004-12-11 at 17:06, Jeff Garzik wrote:
> Rudolf Usselmann wrote:
> > Could anybody tell me which of the previous (non 2.6.9) kernels
> > do support 4GB of main memory in 64 bit mode ?
> 
> 64bit kernels have supported >4GB since their ports inception, AFAIK.
> 
> Your platform could limit this artificially, of course.
> 
> 	Jeff


Yes, but it is currently broken (kernel panics). I wonder
if anybody knew which kernel does work for 64 bit and >4GB
of memory. I'm sure there must be people out there with
similar configurations to mine ....

Thanks,
rudi
(Tiger K8W, dual Opteron)

Re: kernel (64bit) 4GB memory support

[Andrew Walrond]

On Saturday 11 Dec 2004 10:13, Rudolf Usselmann wrote:
>
> Yes, but it is currently broken (kernel panics). I wonder
> if anybody knew which kernel does work for 64 bit and >4GB
> of memory. I'm sure there must be people out there with
> similar configurations to mine ....
>

There are, but most I've had discussions with on LKML and x86-4 ML are running 
recent 2.6 series kernels (successfully).

Best advice is 

1) Upgrade your bios to latest. Bios problems seem to account for most >4Gb 
mem problems on x86_64. Pay careful attention to bios memory settings also.

2) Report problems using lastest 2.4 kernel here for help

If you can use 2.6 kernel, you're likely to get more help. 2.4 is in 
maintenance mode. Most people here will be running/developing 2.6

Andrew Walrond

Re: kernel (64bit) 4GB memory support

[Jeff Garzik]

Rudolf Usselmann wrote:
> On Sat, 2004-12-11 at 17:06, Jeff Garzik wrote:
> 
>>Rudolf Usselmann wrote:
>>
>>>Could anybody tell me which of the previous (non 2.6.9) kernels
>>>do support 4GB of main memory in 64 bit mode ?
>>
>>64bit kernels have supported >4GB since their ports inception, AFAIK.
>>
>>Your platform could limit this artificially, of course.

> Yes, but it is currently broken (kernel panics). I wonder
> if anybody knew which kernel does work for 64 bit and >4GB
> of memory. I'm sure there must be people out there with
> similar configurations to mine ....

All 2.6 kernels work with 64bit and >4GB memory, on my configurations 
(x86-64, ia64, and alpha).

It is a mistake to assume that all 64bit and/or >4GB is broken.


> (Tiger K8W, dual Opteron)

Ok, we finally get a bit of useful information.

Are you CERTAIN that you are booting a 64bit kernel?
Is your memory PC1600, PC2100, or PC2700?
Is your memory installed in matched pairs?
Is all your memory ECC registered?
Is your BIOS at the latest version?

Once we get through the hardware issues, now it is time to do a binary 
search of 2.6 kernels, to see which one works for you.  If no 2.6 
kernels work for you, then give 2.4 kernels a try.

	Jeff

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Sun, 2004-12-12 at 00:47, Jeff Garzik wrote:
...
> All 2.6 kernels work with 64bit and >4GB memory, on my configurations 
> (x86-64, ia64, and alpha).
> 
> It is a mistake to assume that all 64bit and/or >4GB is broken.
> 
> > (Tiger K8W, dual Opteron)
> 
> Ok, we finally get a bit of useful information.
> 
> Are you CERTAIN that you are booting a 64bit kernel?
> Is your memory PC1600, PC2100, or PC2700?
> Is your memory installed in matched pairs?
> Is all your memory ECC registered?
> Is your BIOS at the latest version?

Hi Jeff,

"yes" to all of the above. I am 100% certain this is not a
hardware problem. I have paired simms and with a 32 bit kernel
can use the entire 4GB. I also have run memtest86 ...

> Once we get through the hardware issues, now it is time to do a binary 
> search of 2.6 kernels, to see which one works for you.  If no 2.6 
> kernels work for you, then give 2.4 kernels a try.
> 
> 	Jeff

I have previously reported this bug to the list (about a week
ago). I am greatfull for every response and am willing to
investigate everything.

Previously I was running Fedora Core 2 32BIT with the 2.6.9
kernel and never had problems with 4GB. After finally upgrading
to 64 bit I can't use 4GB memory anymore.


# ver_linux

Linux cpu10 2.6.9RU1.1 #11 SMP Sun Dec 5 11:42:18 ICT 2004 x86_64 x86_64 x86_64 GNU/Linux

Gnu C                  3.4.2
Gnu make               3.80
binutils               2.15.92.0.2
util-linux             2.12a
mount                  2.12a
module-init-tools      3.1-pre5
e2fsprogs              1.35
reiserfsprogs          line
reiser4progs           line
pcmcia-cs              3.2.7
quota-tools            3.12.
PPP                    2.4.2
nfs-utils              1.0.6
Linux C Library        2.3.3
Dynamic linker (ldd)   2.3.3
Procps                 3.2.3
Net-tools              1.60
Kbd                    1.12
Sh-utils               5.2.1
Modules Loaded         autofs4 nfs lockd sunrpc binfmt_misc dm_mod button battery ac nvidia ipv6 ohci_hcd uhci_hcd ehci_hcd hw_random snd_intel8x0 snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc gameport snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore floppy


The attached boot log shows the kernel panic ....

Kind Regards,
rudi

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Sun, 12 Dec 2004, Rudolf Usselmann wrote:

> The attached boot log shows the kernel panic ....

Of course you forgot the boot log.

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

[-- Attachment #1: Type: text/plain, Size: 217 bytes --]

On Sun, 2004-12-12 at 11:41, Zwane Mwaikambo wrote:
> On Sun, 12 Dec 2004, Rudolf Usselmann wrote:
> 
> > The attached boot log shows the kernel panic ....
> 
> Of course you forgot the boot log.

Oops, Sorry !

rudi

[-- Attachment #2: boot2.log.gz --]
[-- Type: application/x-gzip, Size: 11447 bytes --]

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Sun, 12 Dec 2004, Rudolf Usselmann wrote:

> On Sun, 2004-12-12 at 11:41, Zwane Mwaikambo wrote:
> > On Sun, 12 Dec 2004, Rudolf Usselmann wrote:
> > 
> > > The attached boot log shows the kernel panic ....
> > 
> > Of course you forgot the boot log.
> 
> Oops, Sorry !

Please reproduce without the nvidia driver ever loaded.

Thanks,
	Zwane

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

[-- Attachment #1: Type: text/plain, Size: 692 bytes --]

On Sun, 2004-12-12 at 15:32, Zwane Mwaikambo wrote:
> On Sun, 12 Dec 2004, Rudolf Usselmann wrote:
> 
> > On Sun, 2004-12-12 at 11:41, Zwane Mwaikambo wrote:
> > > On Sun, 12 Dec 2004, Rudolf Usselmann wrote:
> > > 
> > > > The attached boot log shows the kernel panic ....
> > > 
> > > Of course you forgot the boot log.
> > 
> > Oops, Sorry !
> 
> Please reproduce without the nvidia driver ever loaded.
> 
> Thanks,
> 	Zwane


ok, un-installed nvidia drivers ...

boot3.log shows a kernel panic as it is starting to run fsck
without me involving any user commands.

b004.log - I tried again (after doing a fsck with only 2gb)
and again it did not make it to a login prompt.

Thanks,
rudi


[-- Attachment #2: boot3.log.gz --]
[-- Type: application/x-gzip, Size: 10293 bytes --]

[-- Attachment #3: boot4.log.gz --]
[-- Type: application/x-gzip, Size: 7958 bytes --]

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Sun, 12 Dec 2004, Rudolf Usselmann wrote:

> ok, un-installed nvidia drivers ...
> 
> boot3.log shows a kernel panic as it is starting to run fsck
> without me involving any user commands.
> 
> b004.log - I tried again (after doing a fsck with only 2gb)
> and again it did not make it to a login prompt.

Thanks for reproducing that, is there any possible chance you could try 
2.6.10-rc2-mm4?

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Sun, 2004-12-12 at 23:35, Zwane Mwaikambo wrote:
> On Sun, 12 Dec 2004, Rudolf Usselmann wrote:
> 
> > ok, un-installed nvidia drivers ...
> > 
> > boot3.log shows a kernel panic as it is starting to run fsck
> > without me involving any user commands.
> > 
> > b004.log - I tried again (after doing a fsck with only 2gb)
> > and again it did not make it to a login prompt.
> 
> Thanks for reproducing that, is there any possible chance you could try 
> 2.6.10-rc2-mm4?

Actually I tried "2.6.10-rc3" a few days ago, and had the same
results. Do you still want me to try "2.6.10-rc2-mm4" ?

Thanks !
rudi

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Tue, 14 Dec 2004, Rudolf Usselmann wrote:

> > Thanks for reproducing that, is there any possible chance you could try 
> > 2.6.10-rc2-mm4?
> 
> Actually I tried "2.6.10-rc3" a few days ago, and had the same
> results. Do you still want me to try "2.6.10-rc2-mm4" ?

No, just the first oops output and your kernel config.

Thanks,
	Zwane

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

[-- Attachment #1: Type: text/plain, Size: 912 bytes --]

On Thu, 2004-12-16 at 14:49, Frank Denis (Jedi/Sector One) wrote:
> On Tue, Dec 14, 2004 at 07:25:31PM +0700, Rudolf Usselmann wrote:
> > Actually I tried "2.6.10-rc3" a few days ago, and had the same
> > results. Do you still want me to try "2.6.10-rc2-mm4" ?
> 
>   Yes, try 2.6.10-rc2-mm4 and apply add this patch:
>   
> ftp://ftp.c9x.org/linux-kernel/2.6.10-rc2/2.6.10-rc2-mm4/2.6.10-rc2-mm4-jedi4.patch.bz2
> 
>   Does it work?

Hi Frank,

no unfortunately it did not work.

The "panics" are different, the kernel seems to be able to
recover from panics ... 

Attached is an archive with ver_linux output, my config file,
and a log file. You might find this to be more useful this time,
as I was able to do several things to make it "crash" at one
point I did a remote login in to this computer and that caused
a crash as well. Definitely a lot more crashes I was able to
capture ....

Kind Regards,
rudi


[-- Attachment #2: jedi.tgz --]
[-- Type: application/x-compressed-tar, Size: 21115 bytes --]

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Thu, 16 Dec 2004, Rudolf Usselmann wrote:

> On Thu, 2004-12-16 at 14:49, Frank Denis (Jedi/Sector One) wrote:
> > On Tue, Dec 14, 2004 at 07:25:31PM +0700, Rudolf Usselmann wrote:
> > > Actually I tried "2.6.10-rc3" a few days ago, and had the same
> > > results. Do you still want me to try "2.6.10-rc2-mm4" ?
> > 
> >   Yes, try 2.6.10-rc2-mm4 and apply add this patch:
> >   
> > ftp://ftp.c9x.org/linux-kernel/2.6.10-rc2/2.6.10-rc2-mm4/2.6.10-rc2-mm4-jedi4.patch.bz2
> > 
> >   Does it work?
> 
> Hi Frank,
> 
> no unfortunately it did not work.
> 
> The "panics" are different, the kernel seems to be able to
> recover from panics ... 
> 
> Attached is an archive with ver_linux output, my config file,
> and a log file. You might find this to be more useful this time,
> as I was able to do several things to make it "crash" at one
> point I did a remote login in to this computer and that caused
> a crash as well. Definitely a lot more crashes I was able to
> capture ....

Rudolf, thanks for collecting that information. Since you said that 
2.6.10-rc3 also had similar results it counts out a number of suspects i 
had in the -mm tree. Could you work towards isolating a working kernel 
version? You could try these;

2.6.8.1
2.6.9
2.6.9-mm1

Thanks,
	Zwane

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Tue, 2004-12-21 at 02:49, Zwane Mwaikambo wrote:
> 
> Rudolf, thanks for collecting that information. Since you said that 
> 2.6.10-rc3 also had similar results it counts out a number of suspects i 
> had in the -mm tree. Could you work towards isolating a working kernel 
> version? You could try these;
> 
> 2.6.8.1
> 2.6.9
> 2.6.9-mm1
> 
> Thanks,
> 	Zwane

Zwane,

is there a more scientific approach to this problem ?

See my problem is that I have a very expensive motherboard
and very expensive simm modules which I already inserted and
removed several dozen times. I would like to avoid doing this
experimenting as much as possible. Specially if there might
be a more contractive way. We don't know if there ever has
been a kernel that has worked with this configuration, right ?

memtest86 seems to detect and test all 4gb just fine. So there
must be some way to find the problem ...

I mean you guys must have a pretty good idea what is going wrong.
Is it possible to add some debugging information ? The latest
mm4-jeda kernel seems to be able to "recover" from panics/crashes.
It doesn't "die" it just kills the offending app (at least thats
my limited understanding).

Kind Regards,
rudi

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Tue, 21 Dec 2004, Rudolf Usselmann wrote:

> I mean you guys must have a pretty good idea what is going wrong.
> Is it possible to add some debugging information ? The latest
> mm4-jeda kernel seems to be able to "recover" from panics/crashes.
> It doesn't "die" it just kills the offending app (at least thats
> my limited understanding).

Ok don't worry about trying to isolate it, there should be a fix for it by 
2.6.10.

Thanks,
	Zwane

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Tue, 2004-12-21 at 23:33, Zwane Mwaikambo wrote:
> 
> Ok don't worry about trying to isolate it, there should be a fix for it by 
> 2.6.10.
> 
> Thanks,
> 	Zwane

Well, if somebody is working on it, I would be happy to very the
fixes and assist in providing additional debugging information.
Please don't take my previous email the wrong way - I do want to
help any way I can ...

Kind Regards,
rudi

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Tue, 21 Dec 2004, Rudolf Usselmann wrote:

> On Tue, 2004-12-21 at 23:33, Zwane Mwaikambo wrote:
> > 
> > Ok don't worry about trying to isolate it, there should be a fix for it by 
> > 2.6.10.
> > 
> > Thanks,
> > 	Zwane
> 
> Well, if somebody is working on it, I would be happy to very the
> fixes and assist in providing additional debugging information.
> Please don't take my previous email the wrong way - I do want to
> help any way I can ...

Not to worry, if you'd like to be notified when the bug is resolved or a 
patch is immediately available you may open a bug on bugzilla.kernel.org, 
upon completion just send me the bug number and i'll assign myself as the 
owner.

Thanks again,
	Zwane

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Tue, 2004-12-21 at 09:56 -0700, Zwane Mwaikambo wrote:
> On Tue, 21 Dec 2004, Rudolf Usselmann wrote:
> 
> > On Tue, 2004-12-21 at 23:33, Zwane Mwaikambo wrote:
> > > 
> > > Ok don't worry about trying to isolate it, there should be a fix for it by 
> > > 2.6.10.
> > > 
> > > Thanks,
> > > 	Zwane
> > 
> > Well, if somebody is working on it, I would be happy to very the
> > fixes and assist in providing additional debugging information.
> > Please don't take my previous email the wrong way - I do want to
> > help any way I can ...
> 
> Not to worry, if you'd like to be notified when the bug is resolved or a 
> patch is immediately available you may open a bug on bugzilla.kernel.org, 
> upon completion just send me the bug number and i'll assign myself as the 
> owner.
> 
> Thanks again,
> 	Zwane



Just curious, did anybody ever look in to this at all ? I keep
on downloading new kernels and trying 4GB of memory - still no
luck.

I did file a bug report but didn't get any notifications at all.
I don't subscribe to the linux-kernel list so not sure if anything
ever came up or not.

Is there a way to get this fixed ?

Thanks,
rudi
=============================================================
Rudolf Usselmann,  ASICS World Services,  http://www.asics.ws
Your Partner for IP Cores, Design, Verification and Synthesis

Re: kernel (64bit) 4GB memory support

[Lennart Sorensen]

On Mon, May 09, 2005 at 10:56:25PM +0700, Rudolf Usselmann wrote:
> Just curious, did anybody ever look in to this at all ? I keep
> on downloading new kernels and trying 4GB of memory - still no
> luck.
> 
> I did file a bug report but didn't get any notifications at all.
> I don't subscribe to the linux-kernel list so not sure if anything
> ever came up or not.
> 
> Is there a way to get this fixed ?

How much ram do you see with 4GB installed running a 64bit kernel?

What does /proc/meminfo show?

How about the memory map dmesg shows at the start of boot?

Len Sorensen

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Mon, 2005-05-09 at 16:07 -0400, Lennart Sorensen wrote:
> On Mon, May 09, 2005 at 10:56:25PM +0700, Rudolf Usselmann wrote:
> > Just curious, did anybody ever look in to this at all ? I keep
> > on downloading new kernels and trying 4GB of memory - still no
> > luck.
> > 
> > I did file a bug report but didn't get any notifications at all.
> > I don't subscribe to the linux-kernel list so not sure if anything
> > ever came up or not.
> > 
> > Is there a way to get this fixed ?
> 
> How much ram do you see with 4GB installed running a 64bit kernel?
> 
> What does /proc/meminfo show?
> 
> How about the memory map dmesg shows at the start of boot?
> 
> Len Sorensen

I do see the full 4G. With Fedora Core 2 32bit, I can use all
4G as well. All my problems started when I "upgraded" to x86_64 ...

Best Regards,
rudi
=============================================================
Rudolf Usselmann,  ASICS World Services,  http://www.asics.ws
Your Partner for IP Cores, Design, Verification and Synthesis

Re: kernel (64bit) 4GB memory support

[Lee Revell]

On Wed, 2005-05-11 at 02:48 +0700, Rudolf Usselmann wrote:
> All my problems started when I "upgraded" to x86_64 ...
> 

And you are surprised by this?

I don't know why so many users buy an arch that didn't exist two years
ago and expect it to be 100% as reliable as 32 bit i386 which has been
around for 20 plus years.  I see tons of bug reports where people don't
bother to mention that "oh, btw this is a mixed 32/64 bit environment"
or whatever.

When you make the choice to live on the bleeding edge, these things will
happen.  If you don't like filling out bug reports stick with a 32 bit
machine ;-)

Lee

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Tue, 2005-05-10 at 16:03 -0400, Lee Revell wrote:
> On Wed, 2005-05-11 at 02:48 +0700, Rudolf Usselmann wrote:
> > All my problems started when I "upgraded" to x86_64 ...
> > 
> 
> And you are surprised by this?
> 
> I don't know why so many users buy an arch that didn't exist two years
> ago and expect it to be 100% as reliable as 32 bit i386 which has been
> around for 20 plus years.  I see tons of bug reports where people don't
> bother to mention that "oh, btw this is a mixed 32/64 bit environment"
> or whatever.
> 
> When you make the choice to live on the bleeding edge, these things will
> happen.  If you don't like filling out bug reports stick with a 32 bit
> machine ;-)
> 
> Lee

Hi Lee,

no I am not surprised !  But, hey, if nobody tries, we will
never debug it, right ?! ;*)

I did fill out a bug report several month ago (and did not mind
it), I was just following up because I didn't hear anything about
it in quite sometime !

Best Regards,
rudi
=============================================================
Rudolf Usselmann,  ASICS World Services,  http://www.asics.ws
Your Partner for IP Cores, Design, Verification and Synthesis

Re: kernel (64bit) 4GB memory support

[Terry Vernon]

"I do see the full 4G. With Fedora Core 2 32bit, I can use all

4G as well. All my problems started when I "upgraded" to x86_64 ..."

Are you using an old 32bit processor or a new 64bit processor? That would make a difference




Rudolf Usselmann wrote:

>On Mon, 2005-05-09 at 16:07 -0400, Lennart Sorensen wrote:
>  
>
>>On Mon, May 09, 2005 at 10:56:25PM +0700, Rudolf Usselmann wrote:
>>    
>>
>>>Just curious, did anybody ever look in to this at all ? I keep
>>>on downloading new kernels and trying 4GB of memory - still no
>>>luck.
>>>
>>>I did file a bug report but didn't get any notifications at all.
>>>I don't subscribe to the linux-kernel list so not sure if anything
>>>ever came up or not.
>>>
>>>Is there a way to get this fixed ?
>>>      
>>>
>>How much ram do you see with 4GB installed running a 64bit kernel?
>>
>>What does /proc/meminfo show?
>>
>>How about the memory map dmesg shows at the start of boot?
>>
>>Len Sorensen
>>    
>>
>
>I do see the full 4G. With Fedora Core 2 32bit, I can use all
>4G as well. All my problems started when I "upgraded" to x86_64 ...
>
>Best Regards,
>rudi
>=============================================================
>Rudolf Usselmann,  ASICS World Services,  http://www.asics.ws
>Your Partner for IP Cores, Design, Verification and Synthesis
>
>-
>To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>
>  
>

Re: kernel (64bit) 4GB memory support

[Stefan Smietanowski]

-----BEGIN PGP SIGNED MESSAGE-----
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Terry Vernon wrote:
> "I do see the full 4G. With Fedora Core 2 32bit, I can use all
> 
> 4G as well. All my problems started when I "upgraded" to x86_64 ..."
> 
> Are you using an old 32bit processor or a new 64bit processor? That
> would make a difference

How on earth would he be able to run ANYTHING that's 64bit if
his CPU was 32bit?

His system is a 64bit system.

// Stefan
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Re: kernel (64bit) 4GB memory support

[Lennart Sorensen]

On Wed, May 11, 2005 at 02:48:42AM +0700, Rudolf Usselmann wrote:
> I do see the full 4G. With Fedora Core 2 32bit, I can use all
> 4G as well. All my problems started when I "upgraded" to x86_64 ...

In 32bit it probably uses the PSE36 extensions or something, which isn't
the same thing as flat 64bit memory access.  It could just be a matter
of needing a memory hole somewhere for PCI space or something.  I only
have 1G in my 64bit machine so I haven't got near these problems.

Len Sorensen

Re: kernel (64bit) 4GB memory support

[Stefan Smietanowski]

-----BEGIN PGP SIGNED MESSAGE-----
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Lennart Sorensen wrote:
> On Wed, May 11, 2005 at 02:48:42AM +0700, Rudolf Usselmann wrote:
> 
>>I do see the full 4G. With Fedora Core 2 32bit, I can use all
>>4G as well. All my problems started when I "upgraded" to x86_64 ...
> 
> 
> In 32bit it probably uses the PSE36 extensions or something, which isn't
> the same thing as flat 64bit memory access.  It could just be a matter
> of needing a memory hole somewhere for PCI space or something.  I only
> have 1G in my 64bit machine so I haven't got near these problems.

I don't recall him saying he's changed kernel from the default redhat
kernel in which case he's running the RedHat 4G/4G split kernel and not
using PSE/PAE.

// Stefan
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Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Thu, 2005-05-12 at 05:56 +0200, Stefan Smietanowski wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Lennart Sorensen wrote:
> > On Wed, May 11, 2005 at 02:48:42AM +0700, Rudolf Usselmann wrote:
> > 
> >>I do see the full 4G. With Fedora Core 2 32bit, I can use all
> >>4G as well. All my problems started when I "upgraded" to x86_64 ...
> > 
> > 
> > In 32bit it probably uses the PSE36 extensions or something, which isn't
> > the same thing as flat 64bit memory access.  It could just be a matter
> > of needing a memory hole somewhere for PCI space or something.  I only
> > have 1G in my 64bit machine so I haven't got near these problems.
> 
> I don't recall him saying he's changed kernel from the default redhat
> kernel in which case he's running the RedHat 4G/4G split kernel and not
> using PSE/PAE.
> 
> // Stefan


I'm using whatever is available on www.kernerl.org :*)

Sorry I am totally lost what the above terminology means.

Is that a configuration option that I should try, or a totally
different branch of the kernel ?

Thanks !
rudi
=============================================================
Rudolf Usselmann,  ASICS World Services,  http://www.asics.ws
Your Partner for IP Cores, Design, Verification and Synthesis

Re: kernel (64bit) 4GB memory support

[William Lee Irwin III]

On Thu, 2005-05-12 at 05:56 +0200, Stefan Smietanowski wrote:
>>> In 32bit it probably uses the PSE36 extensions or something, which isn't
>>> the same thing as flat 64bit memory access.  It could just be a matter
>>> of needing a memory hole somewhere for PCI space or something.  I only
>>> have 1G in my 64bit machine so I haven't got near these problems.

On Thu, May 12, 2005 at 11:04:53AM +0700, Rudolf Usselmann wrote:
>> I don't recall him saying he's changed kernel from the default redhat
>> kernel in which case he's running the RedHat 4G/4G split kernel and not
>> using PSE/PAE.

PSE36 is 4MB pages (no 4KB pages allowed!), 36-bit physical addresses.


-- wli

Re: kernel (64bit) 4GB memory support

[Andi Kleen]

Rudolf Usselmann <rudi@asics.ws> writes:
>
> Just curious, did anybody ever look in to this at all ? I keep
> on downloading new kernels and trying 4GB of memory - still no
> luck.
>
> I did file a bug report but didn't get any notifications at all.
> I don't subscribe to the linux-kernel list so not sure if anything
> ever came up or not.
>
> Is there a way to get this fixed ?

Does the following patch (against a 2.6.12rc3 kernel) fix your problems?

-Andi

Don't look up struct page * of physical address in iounmap

it could be in a memory hole not mapped in mem_map

Signed-off-by: Andi Kleen <ak@suse.de>

Index: linux/arch/x86_64/mm/ioremap.c
===================================================================
--- linux.orig/arch/x86_64/mm/ioremap.c
+++ linux/arch/x86_64/mm/ioremap.c
@@ -272,7 +272,7 @@ void iounmap(volatile void __iomem *addr
 	if ((p->flags >> 20) &&
 		p->phys_addr + p->size - 1 < virt_to_phys(high_memory)) {
 		/* p->size includes the guard page, but cpa doesn't like that */
-		change_page_attr(virt_to_page(__va(p->phys_addr)),
+		change_page_attr_addr(p->phys_addr,
 				 p->size >> PAGE_SHIFT,
 				 PAGE_KERNEL);
 		global_flush_tlb();

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Mon, 9 May 2005, Rudolf Usselmann wrote:

> Just curious, did anybody ever look in to this at all ? I keep
> on downloading new kernels and trying 4GB of memory - still no
> luck.
> 
> I did file a bug report but didn't get any notifications at all.
> I don't subscribe to the linux-kernel list so not sure if anything
> ever came up or not.
> 
> Is there a way to get this fixed ?

I still am unable to find an associated bug with it, is there an updated 
BIOS for your board?

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Mon, 2005-05-09 at 16:24 -0600, Zwane Mwaikambo wrote:
> On Mon, 9 May 2005, Rudolf Usselmann wrote:
> 
> > Just curious, did anybody ever look in to this at all ? I keep
> > on downloading new kernels and trying 4GB of memory - still no
> > luck.
> > 
> > I did file a bug report but didn't get any notifications at all.
> > I don't subscribe to the linux-kernel list so not sure if anything
> > ever came up or not.
> > 
> > Is there a way to get this fixed ?
> 
> I still am unable to find an associated bug with it, is there an updated 
> BIOS for your board?

No there is not. I already have the latest BIOS. The 32 bit
version of Fedora Core 2 seems to work just fine. It's when
I "upgraded" to 64 bit when I could not use 4G of memory
anymore ...

Best Regards,
rudi
=============================================================
Rudolf Usselmann,  ASICS World Services,  http://www.asics.ws
Your Partner for IP Cores, Design, Verification and Synthesis

Re: kernel (64bit) 4GB memory support II

[Andi Kleen]

Rudolf Usselmann <rudi@asics.ws> writes:
>
> Just curious, did anybody ever look in to this at all ? I keep
> on downloading new kernels and trying 4GB of memory - still no
> luck.
>
> I did file a bug report but didn't get any notifications at all.
> I don't subscribe to the linux-kernel list so not sure if anything
> ever came up or not.
>
> Is there a way to get this fixed ?

Does the following patch (against a 2.6.12rc3 kernel) fix your problems?

-Andi

[...]

Please use this version instead, previous one was broken.

Don't look up struct page * of physical address in iounmap

it could be in a memory hole not mapped in mem_map

Signed-off-by: Andi Kleen <ak@suse.de>

Index: linux/arch/x86_64/mm/ioremap.c
===================================================================
--- linux.orig/arch/x86_64/mm/ioremap.c
+++ linux/arch/x86_64/mm/ioremap.c
@@ -272,7 +272,7 @@ void iounmap(volatile void __iomem *addr
 	if ((p->flags >> 20) &&
 		p->phys_addr + p->size - 1 < virt_to_phys(high_memory)) {
 		/* p->size includes the guard page, but cpa doesn't like that */
-		change_page_attr(virt_to_page(__va(p->phys_addr)),
+		change_page_attr_addr(__va(p->phys_addr),
 				 p->size >> PAGE_SHIFT,
 				 PAGE_KERNEL);
 		global_flush_tlb();

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

On Tue, 2004-12-21 at 09:33 -0700, Zwane Mwaikambo wrote:
> On Tue, 21 Dec 2004, Rudolf Usselmann wrote:
> 
> > I mean you guys must have a pretty good idea what is going wrong.
> > Is it possible to add some debugging information ? The latest
> > mm4-jeda kernel seems to be able to "recover" from panics/crashes.
> > It doesn't "die" it just kills the offending app (at least thats
> > my limited understanding).
> 
> Ok don't worry about trying to isolate it, there should be a fix for it by 
> 2.6.10.
> 
> Thanks,
> 	Zwane

Hi Zwane !

just wondering if there where any fixes submitted with 2.6.10
final release for the memory problem. I did not see anything
from bugzilla ....

Kind Regards,
rudi

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Fri, 14 Jan 2005, Rudolf Usselmann wrote:

> > Ok don't worry about trying to isolate it, there should be a fix for it by 
> > 2.6.10.
> 
> just wondering if there where any fixes submitted with 2.6.10
> final release for the memory problem. I did not see anything
> from bugzilla ....

Hi Rudolf,
	I've replied on bugzilla.

Thanks,
	Zwane

Re: kernel (64bit) 4GB memory support

[Rudolf Usselmann]

[-- Attachment #1: Type: text/plain, Size: 572 bytes --]

On Fri, 2005-01-14 at 16:34 -0700, Zwane Mwaikambo wrote:
> On Fri, 14 Jan 2005, Rudolf Usselmann wrote:
> 
> > > Ok don't worry about trying to isolate it, there should be a fix for it by 
> > > 2.6.10.
> > 
> > just wondering if there where any fixes submitted with 2.6.10
> > final release for the memory problem. I did not see anything
> > from bugzilla ....
> 
> Hi Rudolf,
> 	I've replied on bugzilla.
> 
> Thanks,
> 	Zwane


Hi Zwane,

I tried the new kernel, same results. Still can't use the
extra memory.

Attached is the "dmesg" output ...

Kind Regards,
rudi


[-- Attachment #2: new_dump.gz --]
[-- Type: application/x-gzip, Size: 4248 bytes --]

Re: kernel (64bit) 4GB memory support

[Zwane Mwaikambo]

On Sat, 15 Jan 2005, Rudolf Usselmann wrote:

> I tried the new kernel, same results. Still can't use the
> extra memory.

Thanks for testing that Rudolf, i'll find a system to reproduce on.

Re: kernel (64bit) 4GB memory support

[bert hubert]

On Sat, Dec 11, 2004 at 03:16:30PM +0700, Rudolf Usselmann wrote:
> 
> Could anybody tell me which of the previous (non 2.6.9) kernels
> do support 4GB of main memory in 64 bit mode ?

All of 2.6 I would think.

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