Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422644AbWJRQ1p (ORCPT ); Wed, 18 Oct 2006 12:27:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422646AbWJRQ1p (ORCPT ); Wed, 18 Oct 2006 12:27:45 -0400 Received: from ns1.suse.de ([195.135.220.2]:28039 "EHLO mx1.suse.de") by vger.kernel.org with ESMTP id S1422643AbWJRQ1W (ORCPT ); Wed, 18 Oct 2006 12:27:22 -0400 To: "Maciej W. Rozycki" Cc: john stultz , lkml Subject: Re: [PATCH] i386 Time: Avoid PIT SMP lockups References: <1160596462.5973.12.camel@localhost.localdomain> <20061011142646.eb41fac3.akpm@osdl.org> From: Andi Kleen Date: 18 Oct 2006 18:27:14 +0200 In-Reply-To: Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 937 Lines: 19 "Maciej W. Rozycki" 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/