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Subject2.4.21 on SMP has extra slow context switch

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.

Martin Devera aka devik
Linux kernel QoS/HTB maintainer

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