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Subject: Re: [PATCH] 2.4.18 scheduler bugs
To: mingo@elte.hu
Date: Fri, 15 Mar 2002 21:58:13 +0000 (GMT)
Cc: joe.korty@ccur.com (Joe Korty), marcelo@conectiva.com.br (Marcelo Tosatti),
        alan@lxorguk.ukuu.org.uk (Alan Cox),
        torvalds@transmeta.com (Linus Torvalds), linux-kernel@vger.kernel.org
In-Reply-To: <Pine.LNX.4.44.0203152135170.22294-100000@elte.hu> from "Ingo Molnar" at Mar 15, 2002 09:35:49 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> > moment work for them becomes available.  I see no reason why an idle cpu
> > should be forced to remain idle until the next tick, nor why fixing that
> > should be considered `broken'.
> 
> performance. IPIs are expensive.

On a PIII I can see this being the case, especially as they dont power save
on hlt nowdays. But on the Athlon the IPI isnt going down a little side 
channel between cpus.

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