From: Rusty Russell <rusty@rustcorp.com.au>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: cross-cpu balancing with the new scheduler
Date: Mon, 14 Jan 2002 13:19:25 +1100 [thread overview]
Message-ID: <20020114131925.4fcbd127.rusty@rustcorp.com.au> (raw)
In-Reply-To: <3C41BD74.28F6707A@colorfullife.com>
In-Reply-To: <3C41BD74.28F6707A@colorfullife.com>
On Sun, 13 Jan 2002 18:01:40 +0100
Manfred Spraul <manfred@colorfullife.com> wrote:
> Is it possible that the inter-cpu balancing is broken in 2.5.2-pre11?
>
> eatcpu is a simple cpu hog ("for(;;);"). Dual CPU i386.
>
> $nice -19 ./eatcpu&;
> <wait>
> $nice -19 ./eatcpu&;
> <wait>
> $./eatcpu&.
>
> IMHO it should be
> * both niced process run on one cpu.
> * the non-niced process runs with a 100% timeslice.
>
> But it's the other way around:
> One niced process runs with 100%. The non-niced process with 50%, and
> the second niced process with 50%.
This could be fixed by making "nr_running" closer to a "priority sum".
Ingo?
Rusty.
--
Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
next prev parent reply other threads:[~2002-01-14 2:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-13 17:01 cross-cpu balancing with the new scheduler Manfred Spraul
2002-01-14 2:19 ` Rusty Russell [this message]
2002-01-14 2:49 ` Davide Libenzi
2002-01-14 4:37 ` Rusty Russell
2002-01-14 15:39 ` Manfred Spraul
2002-01-14 15:50 ` Davide Libenzi
2002-01-14 17:44 ` Ingo Molnar
2002-01-14 6:10 ` Anton Blanchard
2002-01-15 16:37 ` Ingo Molnar
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