Re: Why HZ on i386 is 100 ?

David Mosberger
2002-04-17T00:49:51Z

>>>>> On Tue, 16 Apr 2002 10:18:18 -0700 (PDT), Davide Libenzi <davidel@xmailserver.org> said:

Davide> i still have pieces of paper on my desk about tests done on
Davide> my dual piii where by hacking HZ to 1000 the kernel build
Davide> time went from an average of 2min:30sec to an average
Davide> 2min:43sec. that is pretty close to 10%

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).

--david