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Date: Thu, 10 Jan 2002 11:09:04 -0800 (PST)
From: Linus Torvalds <torvalds@transmeta.com>
To: Davide Libenzi <davidel@xmailserver.org>
cc: Mike Kravetz <kravetz@us.ibm.com>, Ingo Molnar <mingo@elte.hu>,
        lkml <linux-kernel@vger.kernel.org>,
        george anzinger <george@mvista.com>
Subject: Re: [patch] O(1) scheduler, -D1, 2.5.2-pre9, 2.4.17
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On Thu, 10 Jan 2002, Davide Libenzi wrote:
> >
> > It wasn't a good night for benchmarking.  I had a typo in the
> > script to run chat reniced and as a result didn't collect any
> > numbers for this.  In addition, the kernel with Davide's patch
> > failed to boot with 8 CPUs enabled.  Can't see any '# CPU specific'
> > mods in the patch.  In any case, here is what I do have.
>
> Doh !! Do you have a panic dump Mike ?

I bet it's just the placement of "init_idle()" in init/main.c, which is
unrelated to the scheduling proper, but if the kernel thread is started
before the boot CPU has done its "init_idle()", then the scheduler state
isn't really set up fully yet.

(Old bug, I think its been there for a long time, I just think that the
old scheduler didn't much care, and the "child runs first" logic in
particular of the new scheduler probably just showed it more clearly)

		Linus

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