New: kswapd continuously active when doing IO

Bugme-new Andrew Morton 1 participant 1 message Jul 8, 2010 1 message not in the archive Memory management

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Andrew Morton

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2010-07-08 21:30 UTC #1 lore raw

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Quoted 33 lines · On Wed, 7 Jul 2010 10:58:50 GMT [email protected] 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: [email protected]
        ReportedBy: [email protected]
        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)

Quoted 7 lines

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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