linux-kernel - Re: sync hangs

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Date:	Mon, 14 Feb 2011 22:07:42 +0100
From:	Jesper Krogh <jesper@...gh.cc>
To:	Jan Kara <jack@...e.cz>
CC:	linux-kernel@...r.kernel.org,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: sync hangs - 2.6.35.10

On 2011-02-01 13:14, Jan Kara wrote:
>    Definitely. There have been several patches fixing livelock issues
> in this area under various conditions. Considering your use case, you
> might be hit by problems being fixed by commits:
> 6585027a5e8cb490e3a761b2f3f3c3acf722aff2
> aa373cf550994623efb5d49a4d8775bafd10bbc1
> b9543dac5bbc4aef0a598965b6b34f6259ab9a9b
> (went into 2.6.38-rc1)
I couldn't get above to apply on a 2.6.35.10 kernel, but applied to
a 2.6.37 the problem seems solved. Have they been queued up for stable?
> possibly also older
> 7624ee72aa09334af072853457a5d46d9901c3f8
> (in 2.6.36-rc1)
This one alone applied to 2.6.35 didn't solve it.

jk@...de:~$ time sync

real    19m2.650s
user    0m0.000s
sys    0m0.030s

Without notable disk-activity while waiting. (<5MB/s measured using dstat)
This sample was "decent" I've seen sync times over 2 horus on this system
with 128GB of memory.. again without any notable disk-activity while 
waiting.

Thanks for your prompt response.

-- 
Jesper
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