Messages in this thread | | | From | Con Kolivas <> | Subject | Re: 2.6.0-test4-mm1 - kswap hogs cpu OO takes ages to start! | Date | Wed, 27 Aug 2003 21:37:42 +1000 |
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On Thu, 28 Aug 2003 07:38, warudkar@vsnl.net wrote: > Trying out 2.6.0-test4-mm1. Inside KDE, I start OpenOffice.org, Rational > Rose and Konsole at a time. All of these take extremely long time to > startup. (approx > 5 minutes). Kswapd hogs the CPU all the time. X becomes > unusable till all of them startup, although I can telnet and run top. Same > thing run under 2.4.18 starts up in 3 minutes, X stays usable and kswapd > never take more than 2% CPU.
Yes I can reproduce this with a memory heavy load as well on low memory (linking at the end of a big kernel compile is standard problem). I actually found the best workaround was to increase the swappiness instead of decreasing it.
Try echo 100 > /proc/sys/vm/swappiness
time it
then try echo 0 > /proc/sys/vm/swappiness
you'll see that at low swappiness kswapd0 can use ridiculous amounts of cpu trying to avoid swap. The default is 60.
Con
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