Messages in this thread | | | Date | Sun, 7 May 2006 09:50:39 -0700 | From | Andrew Morton <> | Subject | Re: High load average on disk I/O on 2.6.17-rc3 |
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On Fri, 5 May 2006 10:10:19 -0700 Jason Schoonover <jasons@pioneer-pra.com> wrote:
> I'm having some problems on the latest 2.6.17-rc3 kernel and SCSI disk I/O. > Whenever I copy any large file (over 500GB) the load average starts to slowly > rise and after about a minute it is up to 7.5 and keeps on rising (depending > on how long the file takes to copy). When I watch top, the processes at the > top of the list are cp, pdflush, kjournald and kswapd.
This is probably because the number of pdflush threads slowly grows to its maximum. This is bogus, and we seem to have broken it sometime in the past few releases. I need to find a few quality hours to get in there and fix it, but they're rare :(
It's pretty harmless though. The "load average" thing just means that the extra pdflush threads are twiddling thumbs waiting on some disk I/O - they'll later exit and clean themselves up. They won't be consuming significant resources.
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