From: Andi Kleen <ak@suse.de>
To: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: john stultz <johnstul@us.ibm.com>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] i386 Time: Avoid PIT SMP lockups
Date: 18 Oct 2006 18:27:14 +0200 [thread overview]
Message-ID: <p73y7rdbndp.fsf@verdi.suse.de> (raw)
In-Reply-To: <Pine.LNX.4.64N.0610181650001.28841@blysk.ds.pg.gda.pl>
"Maciej W. Rozycki" <macro@linux-mips.org> writes:
> On Wed, 11 Oct 2006, Andrew Morton wrote:
>
> > So this patch has the potential to screw up people who have 2-way or 4-way,
> > no hpet/pm-timer and dodgy TSCs.
>
> Note that all APIC-based SMP systems (even these rare i486 beasts) by
> definition do have local APIC timers, one per CPU, with a reasonable
> resolution which could likely be used instead.
It wouldn't work on dual core laptop chipsets which support C3 and where
the APIC timer stops during C3.
I had a apicrunsmaintimer option for some time on x86-64 but it broke
on a few other non laptop machines for unknown reasons too, so I cannot
really recommend it.
-Andi
next prev parent reply other threads:[~2006-10-18 16:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-11 19:54 [PATCH] i386 Time: Avoid PIT SMP lockups john stultz
2006-10-11 21:26 ` Andrew Morton
2006-10-11 22:48 ` john stultz
2006-10-11 23:03 ` Andrew Morton
2006-10-16 13:48 ` Andi Kleen
2006-10-16 18:39 ` Andrew Morton
2006-10-16 18:42 ` Andi Kleen
2006-10-16 19:09 ` john stultz
2006-10-18 16:16 ` Maciej W. Rozycki
2006-10-18 16:27 ` Andi Kleen [this message]
2006-10-18 16:45 ` Maciej W. Rozycki
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