linux-ext4 - [Bug 14830] When other IO is running sync times go to 10 to 20 minutes

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Message-Id: <201004290931.o3T9V6iq023616@demeter.kernel.org>
Date:	Thu, 29 Apr 2010 09:31:06 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14830] When other IO is running sync times go to 10 to 20
 minutes

https://bugzilla.kernel.org/show_bug.cgi?id=14830


Ritesh Raj Sarraf <rrs@...earchut.com> changed:

           What    |Removed                     |Added
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                 CC|                            |rrs@...earchut.com




--- Comment #36 from Dave Chinner <david@...morbit.com>  2010-04-20 05:24:39 ---
(In reply to comment #35)

> Are you aware that this blocks other IO so that a user who requests
> a read of some data may have to wait for something like 20 minutes
> before getting a response? This includes, for instance, just typing
> vi xxx.

That's not a just a read - vi(m) writes a backup file when you open
it. So it's blocking on writes.

However, that sort of antisocial behaviour under heavy write loads is usually
caused by a filesystem concurrency limitation or a IO scheduler problem, not
sync. However, unless you can reproduce the read hangs on XFS when sync is
running, then I'm not the expert you're looking for to debug them. ;)

But I do know the endless sync problem is filesystem independent and I'm trying
to do something about mitigating it's effects:

http://lkml.org/lkml/2010/4/19/410

> Take a look at the reports above which show nfsd being effectively
> blocked for periods of more than 20 minutes.

Can't say I've heard of any such recent problems on XFS....

Cheers,

Dave.

--- Comment #37 from Neil Broomfield <neil.broomfield@...saudio.com>  2010-04-20 09:00:28 ---
"Can't say I've heard of any such recent problems on XFS...."

Are these not effectivly the same issue?:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/276476

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/494476

Neil

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