From: Andrew Morton <akpm@linux-foundation.org>
To: tolzmann@molgen.mpg.de, linux-mm@kvack.org
Cc: bugzilla-daemon@bugzilla.kernel.org,
bugme-daemon@bugzilla.kernel.org,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Rik van Riel <riel@redhat.com>
Subject: Re: [Bugme-new] [Bug 16348] New: kswapd continuously active when doing IO
Date: Thu, 8 Jul 2010 14:28:47 -0700 [thread overview]
Message-ID: <20100708142847.375e505e.akpm@linux-foundation.org> (raw)
In-Reply-To: <bug-16348-10286@https.bugzilla.kernel.org/>
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Wed, 7 Jul 2010 10:58:50 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=16348
>
> Summary: kswapd continuously active when doing IO
> Product: IO/Storage
> Version: 2.5
> Kernel Version: 2.6.34
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: high
> Priority: P1
> Component: Other
> AssignedTo: io_other@kernel-bugs.osdl.org
> ReportedBy: tolzmann@molgen.mpg.de
> Regression: Yes
>
>
> Hi..
>
> this bug may be related to #15193 where i attached the issue as a comment.
> since bug #15193 has status RESOLVED PATCH_ALREADY_AVAILABLE and not CLOSED
> CODE_FIX i file the situation as a new bug since the problem still exists for
> us.
>
> THE ISSUE:
> we are currently having trouble with continuously running kswapds consuming up
> to 100% CPU time when the system is busy doing (heavy) I/O.
>
> to reproduce (on our machines): dd if=/dev/zero of=somefile will activate all
> kswapds when the file reaches the size of the installed memory (our systems
> have 8G up to 256G). (same effect on local reiserfs and local xfs)
>
> In kernel 2.6.34 (and 2.6.35-rc3) this issue causes the system to become very
> very slow and unresponsive.
>
> we switched back to 2.6.34-rc6 which seems to have no issues with the same IO.
>
> what information can i provide to help fixing this issue.
>
That's odd - there are no changes in mm/vmscan.c between 2.6.34-rc6 and
2.6.34. Are you sure about those kernel versions?
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parent reply other threads:[~2010-07-08 21:30 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <bug-16348-10286@https.bugzilla.kernel.org/>]
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