>>>>> 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.
--david
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