(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@xxxxxxxxxxxxxxxxxxx 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@xxxxxxxxxxxxxxxxxxxx > ReportedBy: tolzmann@xxxxxxxxxxxxx > 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? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>