linux-kernel - Re: 2.6.29.1: nfsd: page allocation failure

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Date:	Thu, 18 Jun 2009 02:14:17 +0200
From:	Zdenek Kaspar <zkaspar82@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Justin Piszcz <jpiszcz@...idpixels.com>
Subject:  Re: 2.6.29.1: nfsd: page allocation failure - nfsd or kernel problem?

Michael Tokarev napsal(a):
> J. Bruce Fields wrote:
>> On Wed, Jun 17, 2009 at 02:39:06PM +0400, Michael Tokarev wrote:
>>> Justin Piszcz wrote:
>>>>
>>>> On Wed, 17 Jun 2009, Michael Tokarev wrote:
>>>>
>>>>> Michael Tokarev wrote:
>>>>>> Justin Piszcz wrote:
>>>>> ...
>>>>>
>>>>> Justin, by the way, what's the underlying filesystem on the server?
>>>>>
>>>>> I've seen this error on 2 machines already (both running 2.6.29.x 
>>>>> x86-64),
>>>>> and in both cases the filesystem on the server was xfs.  May this be
>>>>> related somehow to http://bugzilla.kernel.org/show_bug.cgi?id=13375 ?
>>>>> That one is different, but also about xfs and nfs.  I'm trying to
>>>>> reproduce the problem on different filesystem...
>>>> Hello, I am also running XFS on 2.6.29.x x86-64.
>>>>
>>>> For me, the error happened when I was running an XFSDUMP from a
>>>> client  (and dumping) the stream over NFS to the XFS
>>>> server/filesystem.  This is typically when the error occurs or
>>>> during heavy I/O.
>>> Very similar load was here -- not xfsdump but tar and dump of an ext3
>>> filesystems.
>>>
>>> And no, it's NOT xfs-related: I can trigger the same issue easily on
> 
> Note the NOT, in upper case ;)
> 
>>> ext4 as well.  About 20 minutes of running 'dump' of another fs
>>> to the nfs mount and voila, nfs server reports the same page allocation
>>> failure.  Note that all file operations are still working, i.e. it
>>> produces good (not corrupted) files on the server.
>>
>> There's a possibly related report for 2.6.30 here:
>>
>>     http://bugzilla.kernel.org/show_bug.cgi?id=13518
> 
> Does not look similar.
> 
> I repeated the issue here.  The slab which is growing here is buffer_head.
> It's growing slowly -- right now, after ~5 minutes of constant writes over
> nfs, its size is 428423 objects, growing at about 5000 objects/minute rate.
> When stopping writing, the cache shrinks slowly back to an acceptable
> size, probably when the data gets actually written to disk.
> 
> It looks like we need a bug entry for this :)
> 
> I'll re-try 2.6.30 hopefully tomorrow.
> 
> /mjt

Can you try if increasing vm.min_free_kbytes will help you? I
"temp-fixed" heavy I/O problems with vm.min_free_kbytes=32768 on machine
with 4G memory.

Z.

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