Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265732AbUF2MHn (ORCPT ); Tue, 29 Jun 2004 08:07:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265747AbUF2MHn (ORCPT ); Tue, 29 Jun 2004 08:07:43 -0400 Received: from jurand.ds.pg.gda.pl ([153.19.208.2]:34200 "EHLO jurand.ds.pg.gda.pl") by vger.kernel.org with ESMTP id S265732AbUF2MHi (ORCPT ); Tue, 29 Jun 2004 08:07:38 -0400 Date: Tue, 29 Jun 2004 14:07:36 +0200 (CEST) From: "Maciej W. Rozycki" To: john stultz Cc: Frederic Krueger , lkml Subject: Re: io apic + tsc = slowdown (bugreport + possible fix) In-Reply-To: <1088467569.1944.10.camel@cog.beaverton.ibm.com> Message-ID: References: <40DFC853.20803@bigfoot.com> <1088467569.1944.10.camel@cog.beaverton.ibm.com> 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: 919 Lines: 23 On Mon, 28 Jun 2004, john stultz wrote: > Looking closer at the proposed workaround by Maciej posted here: > http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-04/3174.html > > Why exactly are we using cpu_has_tsc to switch this? I'm not sure I'm > following how this is TSC dependent. Additionally the comment change > looks to be from the 2.4 era. One of the two users of timer_ack is do_slow_gettimeoffset(). When the TSC is selected for use as a high-precision timer do_fast_gettimeoffset() is used instead. Please folks do read the sources sometimes -- I've been repeatedly clarifying these bits while they are all documented in the sources, sigh... Maciej - 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/