Bug#657078: linux-image-3.2.0-1-amd64: Support for new NFS id mapper

[Rik Theys <rik.theys@gmail.com>]

Hi Ben,

On Mon, Jan 23, 2012 at 11:28 PM, Ben Hutchings <ben@decadent.org.uk> wrote:
> On Mon, Jan 23, 2012 at 10:43:18PM +0100, Rik Theys wrote:
>> Please consider enabling the new NFS ID mapper functionality in the kernel:
>>
>> CONFIG_NFS_USE_NEW_IDMAPPER

>> Enabling this feature should prevent page allocation failure errors we frequently
>> get on our file servers, as mentioned on
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=593035

> The allocation failure has already been reported as #636306.  I
> proposed a fix for that in <http://bugs.debian.org/636306#35>.

I agree enabling the new feature for squeeze is not an option, but can
it be considered for wheezy/sid? I assume the new feature is the Way
Forward?

The patch in #636306 has not been tested so far? I can not apply the
patch on our production system, but I can try to see if I can
reproduce the bug on a test machine. Has the patch been sent upstream?

On our production system I've also increased vm.min_free_kbytes to
512MB, which I believed would reduce the number of times we're seeing
these allocation failures. But it doesn't seem to help all that much.
The system has 72GB ram so I could increase it to 1GB or something.
Would that make sense?

Regards,

Rik



-- 

Rik