Messages in this thread | | | From | David Mosberger <> | Date | Tue, 16 Apr 2002 09:50:21 -0700 | Subject | Re: Why HZ on i386 is 100 ? |
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>>>>> On Tue, 16 Apr 2002 16:27:12 +0000 (UTC), torvalds@transmeta.com (Linus Torvalds) said:
Linus> And I've had some Intel people grumble about it, because it Linus> apparently means that the timer tick takes anything from 2% Linus> to an extreme of 10% (!!) of the CPU time under certain Linus> loads.
I'm not sure I believe this. I have had occasional cases where I wondered whether the timer tick caused significant overhead, but it always turned out to be something else. In my measurements, *user-level* profiling has the 2-10% overhead you're mentioning, but that's with a signal delivered to user level on each tick.
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