Messages in this thread | | | From | "Sylvain COUTANT" <> | Subject | RE: High CPU usage (up to server hang) under heavy I/O load | Date | Mon, 16 Aug 2004 12:11:48 +0200 |
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Hi Marcello,
> You want to try this
The server now runs 2.4.26 with the patch applied for about two hours. I have triggered backups so that it is a little bit stressed.
My first feeling is something changed. Once the whole physical memory has been in use by the kernel, I saw some load problems rising (as before), but the server did not hang (as before ;-) and system load has gone down smoothly (took about one or two minutes).
Now it looks stable under medium I/O load. I'll give it more stress next night and I'll report the behaviour here.
However, kswapd is still a major CPU eater : 5 minutes of CPU time consumed since the reboot (2 hours). kupdated is at 1 minute and bdflush is 12 seconds. /proc/sys/vm are boot time standard settings with no change. Actual system load is near 4 for 15 minutes average, which I consider very bad result regarding currently running application. I believe I should be near 1 ...
Do you think I could achieve better results (smoother operations) by tweaking those /proc/sys/vm settings ?
Regards, Sylvain.
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