David Mosberger wrote:
> The last time I measured timer tick overhead on ia64 it was well below
> 1% of overhead. I don't really like using kernel builds as a
> benchmark, because there are far too many variables for the results to
> have any long-term or cross-platform value. But since it's popular, I
> did measure it quickly on a relatively slow (old) Itanium box: with
> 100Hz, the kernel compile was about 0.6% faster than with 1024Hz
> (2.4.18 UP kernel).
Did you try a parallell build, with the number of processes at least
2-3 times the number of processors? Then you get more
of the cache-miss effects from switching processes, not
merely the overhead of the fairly fast scheduler.
Helge Hafting
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This archive was generated by hypermail 2b29 : Tue Apr 23 2002 - 22:00:17 EST