Messages in this thread | | | Date | Mon, 10 May 1999 14:12:44 +0200 | From | Pavel Machek <> | Subject | Re: [patch] new scheduler |
| |
Hi!
> > 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]$
Uch, ouch. I posted code without trying it first. I know it worked once some time ago, but I was unable to reproduce it. (You always needed to tune constants "right", but I can not seem to do that now.)
> (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.)
I do not think my patches went in. If it currently works, problem might have just gone away :-).
Pavel -- The best software in life is free (not shareware)! Pavel GCM d? s-: !g p?:+ au- a--@ w+ v- C++@ UL+++ L++ N++ E++ W--- M- Y- R+
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |