Messages in this thread | | | Date | Mon, 10 May 1999 12:37:42 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: [patch] new scheduler |
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On Mon, 10 May 1999, Pavel Machek wrote:
> This easily doable on linux, too. Even on current scheduler (because > it has problems with accounting...):
> PS: It would be nice to modify kernel to be _pessimistic_ about > idle. Right now it is so optimistic that you can run boy bad and see > 0% cpu utilization when it is in fact 80%. It would be much better to > report worse values than to report better values.
i cant seem to be able to reproduce the 'bad' behavior on 2.2.8:
[mingo@moon lo]$ time ./badguy I'm a good boy. ..........4.66 user 0.41 system 0:05.07 elapsed 99%CPU [mingo@moon lo]$ time ./badguy bad I'm a *BAD* boy! And bad boys know that jiffie is 20msec ..........4.66 user 0.43 system 0:05.12 elapsed 99%CPU [mingo@moon lo]$
(i've tried it both on SMP and UP boxes) In both cases the kernel says we've spent almost 100% as user-time. (are you sure 2.2 still has this problem? I saw your(?) timer tick accounting fix half a year ago, and i thought it went into the kernel, but i could be wrong.)
-- mingo
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