[Lustre-discuss] page allocation failure
Alex
linux at vfemail.net
Fri Nov 28 01:14:47 PST 2008
On Thursday 27 November 2008 20:30, Andreas Dilger wrote:
> On Nov 26, 2008 19:04 +0800, Wang lu wrote:
> > The %util of memory on OSS was always around 10% ,even when OSS was going
> > to die.
> >
> > The OSS kernel is:
> > 2.6.9-67.0.7.EL_lustre.1.6.5smp(32bit)
> >
> > Lustre version is 1.6.5.1
> >
> > We have 8GB physical memory and 16GB(never been used) swap total.
> >
> > Is there a problem with memory management?
>
> The problem is with the 32-bit kernel. Linux doesn't allow a 32-bit
> kernel to use more than 900MB of memory on a 32-bit system, no matter
> how much RAM is installed. 900MB/8192MB ~= 10% of RAM.
I want to clarify this, because i don't understand why are you saying that it
can be used max 900MB of our RAM! Afaik, on 32bit system, we have the
following limits:
- max 4GiB RAM using kernel without PAE (Physical Address Extension)
- max 64GiB RAM using kernel with PAE (extend physical address size from 32 to
36bits)
> Swap is not
> useful for the kernel.
>
Why?
Regards,
Alx
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