Messages in this thread | | | Date | Wed, 17 Apr 2002 09:55:02 +0200 | From | Helge Hafting <> | Subject | Re: Why HZ on i386 is 100 ? |
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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.
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