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Date: Tue, 8 Jan 2002 19:08:13 -0200 (BRST)
From: Rik van Riel <riel@conectiva.com.br>
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To: Daniel Phillips <phillips@bonn-fries.net>
Cc: Andrew Morton <akpm@zip.com.au>, Anton Blanchard <anton@samba.org>,
        Andrea Arcangeli <andrea@suse.de>,
        Luigi Genoni <kernel@Expansa.sns.it>,
        Dieter N?tzel <Dieter.Nuetzel@hamburg.de>,
        Marcelo Tosatti <marcelo@conectiva.com.br>,
        Linux Kernel List <linux-kernel@vger.kernel.org>,
        Robert Love <rml@tech9.net>
Subject: Re: [2.4.17/18pre] VM and swap - it's really unusable
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On Tue, 8 Jan 2002, Daniel Phillips wrote:

> The preemptible kernel can reschedule, on average, sooner than the
> scheduling-point kernel, which has to wait for a scheduling point to
> roll around.

The preemptible kernel ALSO has to wait for a scheduling point
to roll around, since it cannot preempt with spinlocks held.

Considering this, I don't see much of an advantage to adding
kernel preemption.

regards,

Rik
-- 
"Linux holds advantages over the single-vendor commercial OS"
    -- Microsoft's "Competing with Linux" document

http://www.surriel.com/		http://distro.conectiva.com/

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