Re: [PATCH] Binding processes to selected CPUs

avik@altavista.net
Wed, 13 Oct 1999 04:40:55 -0400 (EDT)

>
> do you have numbers to prove your contention that the kernel's
> default scheduler causes so many cross-processor migrations that
> you see some performance effect? if you do the math, you'll find
> that the worst-case scenario is that a migration typically costs
> around a millisecond. unless you're seeing many per second,
> it's not significant.
>

I redid my tests, this time against physical memory,
and they show that there is no performance gain with
128kB caches. Perhaps machines with more cpus and
larger caches will benefit, but the smaller ones will
not.

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