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Re: kernel 2.6.22 pdflush consumes ~90% cpu

To: Muralitharan Perumal <muralitharan.perumal@xxxxxxxx>, xfs@xxxxxxxxxxx
Subject: Re: kernel 2.6.22 pdflush consumes ~90% cpu
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Mon, 13 Jan 2014 14:50:00 -0600
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <52D3FF2E.3010901@xxxxxxxx>
References: <52D3FF2E.3010901@xxxxxxxx>
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On 1/13/14, 8:58 AM, Muralitharan Perumal wrote:
> Hi,
> 
> I am currently working on an embedded platform involving XFS as the
> preferred fs. Earlier, ext3 was used but now replaced with XFS. The unit
> is working fine with ext3 but after replacing with XFS, I am seeing a
> few issues:

a 7 year old kernel on an embedded platform?  Nobody here will be able
to spend much time on this I'm afraid.

> a) Occassionally I am getting the following error when we write files to
> the fs:
> 
> attempt to access beyond end of device
> sda1: rw=0, want=10487141907480064, limit=9766912
> I/O error in filesystem ("sda1") meta-data dev sda1 block 0x254200001abdf8    
>    ("xfs_trans_read_buf") error 5 buf count 4096
> attempt to access beyond end of device
> sda1: rw=0, want=10487141907480064, limit=9766912
> I/O error in filesystem ("sda1") meta-data dev sda1 block 0x254200001abdf8    
>    ("xfs_trans_read_buf") error 5 buf count 4096

looks like on-disk corruption.  xfs_repair is probably warranted.

> b) After running for about 20 to 25 minutes, the pdflush consumes about 90% 
> cpu and stuck there in D state:

do a sysrq-w to get backtraces of all blocked tasks, and that might yield a 
clue for you.

-Eric
 
> Is there any similar issue seen with kernel 2.6.22? Am I missing any XFS 
> patches that could fix this?
> 
> Any pointers would be helpful.
> 
> Thanks,
> Murali
> 
> 
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