Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261464AbVDCEFK (ORCPT ); Sat, 2 Apr 2005 23:05:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261467AbVDCEFK (ORCPT ); Sat, 2 Apr 2005 23:05:10 -0500 Received: from ip214-49.coastside.net ([207.213.214.33]:16325 "EHLO jlundell.local") by vger.kernel.org with ESMTP id S261464AbVDCEFG (ORCPT ); Sat, 2 Apr 2005 23:05:06 -0500 Mime-Version: 1.0 Message-Id: In-Reply-To: <1112429616.24111.7.camel@mindpipe> References: <88056F38E9E48644A0F562A38C64FB6004629635@scsmsx403.amr.corp.intel.com> <1112429616.24111.7.camel@mindpipe> Date: Sat, 2 Apr 2005 20:04:58 -0800 To: LKML From: Jonathan Lundell Subject: RE: x86 TSC time warp puzzle Content-Type: text/plain; charset="us-ascii" ; format="flowed" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1034 Lines: 23 At 3:13 AM -0500 4/2/05, Lee Revell wrote: >On Fri, 2005-04-01 at 23:05 -0800, Pallipadi, Venkatesh wrote: >> It can be SMI happening in the platform. Typically BIOS uses some SMI > > polling to handle some devices during early boot. Though 500 >microseconds > sounds a bit too high. > >Nope, that sounds just about right. Buggy BIOSes that implement ACPI >via SMM (or so I have been told) can stall the machine for over a >millisecond, this is why some laptops lose timer ticks at HZ=1000. The >issue is well known by Linux audio users, as it causes big problems for >people who buy laptops for live audio use. This is a desktop board, and this is well after boot (hours). Also, ACPI is disabled in the BIOS. I suppose I can try to disable SMI via the APIC? -- /Jonathan Lundell. - 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/