From: devik <devik@cdi.cz>
To: <linux-kernel@vger.kernel.org>
Subject: 2.4.21 on SMP has extra slow context switch
Date: Wed, 27 Aug 2003 14:03:22 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.33.0308271358200.529-100000@devix> (raw)
Hello,
I upgraded one SMP box (Soyo MB, 2x PII/350, 500MB) from
2.4.8 (really) to 2.4.21 last week. Users start to complaint
that it is slow.
I run lmbench's context switch measurer and it's result is:
"size=0k ovr=5.41
2 169.26
3 111.28
4 83.99
While on very similar UP system (the same CPU & kernel) it is:
"size=0k ovr=3.50
2 1.80
3 2.08
4 2.89
Have someone even idea what is going on ? The systems seems to be
fairly stable but slooow.
I plan to reboot with single CPU at evening and/or upgrade to .22,
but the numbers above are weird.
thanks,
-------------------------------
Martin Devera aka devik
Linux kernel QoS/HTB maintainer
http://luxik.cdi.cz/~devik/
next reply other threads:[~2003-08-27 12:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-27 12:03 devik [this message]
2003-08-27 14:42 ` devik
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