From: Ingo Molnar <mingo@elte.hu>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linuxppc-dev@ozlabs.org,
"Michel Dänzer" <michel@tungstengraphics.com>,
vatsa@linux.vnet.ibm.com
Subject: Re: ppc32: Weird process scheduling behaviour with 2.6.24-rc
Date: Mon, 28 Jan 2008 13:32:53 +0100 [thread overview]
Message-ID: <20080128123253.GA32496@elte.hu> (raw)
In-Reply-To: <1201510236.6149.24.camel@lappy>
* Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
> > * With CONFIG_FAIR_USER_SCHED disabled, there are severe
> > interactivity hickups with a niced CPU hog and top running. This
> > started with commit 810e95ccd58d91369191aa4ecc9e6d4a10d8d0c8.
>
> The revert at the bottom causes the wakeup granularity to shrink for +
> nice and to grow for - nice. That is, it becomes easier to preempt a +
> nice task, and harder to preempt a - nice task.
i think it would be OK to do half of this: make it easier to preempt a
+nice task. Michel, do you really need the -nice portion as well? It's
not a problem to super-preempt positively reniced tasks, but it can be
quite annoying if negatively reniced tasks have super-slices.
Ingo
next prev parent reply other threads:[~2008-01-28 12:33 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-18 12:34 ppc32: Weird process scheduling behaviour with 2.6.24-rc Michel Dänzer
2008-01-22 14:56 ` Michel Dänzer
2008-01-23 12:18 ` Michel Dänzer
2008-01-23 12:36 ` Peter Zijlstra
2008-01-23 13:14 ` Michel Dänzer
2008-01-24 8:18 ` Benjamin Herrenschmidt
2008-01-24 8:46 ` Benjamin Herrenschmidt
2008-01-25 10:57 ` Michel Dänzer
2008-01-23 12:42 ` Peter Zijlstra
2008-01-25 6:54 ` Benjamin Herrenschmidt
2008-01-25 7:03 ` Benjamin Herrenschmidt
2008-01-25 7:25 ` Benjamin Herrenschmidt
2008-01-25 8:50 ` Peter Zijlstra
2008-01-26 4:07 ` Srivatsa Vaddagiri
2008-01-26 4:13 ` Benjamin Herrenschmidt
2008-01-26 5:07 ` Srivatsa Vaddagiri
2008-01-26 5:15 ` Benjamin Herrenschmidt
2008-01-26 9:26 ` Srivatsa Vaddagiri
2008-01-26 5:07 ` Srivatsa Vaddagiri
2008-01-27 16:13 ` Michel Dänzer
2008-01-28 4:25 ` Benjamin Herrenschmidt
2008-01-28 8:16 ` Michel Dänzer
2008-01-28 8:50 ` Peter Zijlstra
2008-01-28 9:14 ` Michel Dänzer
2008-01-28 12:11 ` Srivatsa Vaddagiri
2008-01-28 12:32 ` Ingo Molnar [this message]
2008-01-28 12:53 ` Peter Zijlstra
2008-01-28 12:56 ` Ingo Molnar
2008-01-29 10:14 ` Michel Dänzer
2008-01-28 13:11 ` Srivatsa Vaddagiri
2008-01-25 11:34 ` Michel Dänzer
2008-01-25 15:04 ` Michel Dänzer
2008-01-25 21:10 ` Benjamin Herrenschmidt
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