From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266560AbUJFBAd (ORCPT ); Tue, 5 Oct 2004 21:00:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266561AbUJFBAd (ORCPT ); Tue, 5 Oct 2004 21:00:33 -0400 Received: from umhlanga.stratnet.net ([12.162.17.40]:63829 "EHLO umhlanga.STRATNET.NET") by vger.kernel.org with ESMTP id S266560AbUJFBAX (ORCPT ); Tue, 5 Oct 2004 21:00:23 -0400 To: Jeff Garzik Cc: linux-kernel@vger.kernel.org X-Message-Flag: Warning: May contain useful information References: <4136E4660006E2F7@mail-7.tiscali.it> <41634236.1020602@pobox.com> From: Roland Dreier Date: Tue, 05 Oct 2004 18:00:16 -0700 In-Reply-To: <41634236.1020602@pobox.com> (Jeff Garzik's message of "Tue, 05 Oct 2004 20:54:14 -0400") Message-ID: <52is9or78f.fsf_-_@topspin.com> User-Agent: Gnus/5.1006 (Gnus v5.10.6) XEmacs/21.4 (Security Through Obscurity, linux) MIME-Version: 1.0 X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: roland@topspin.com Subject: Preempt? (was Re: Cannot enable DMA on SATA drive (SCSI-libsata, VIA SATA)) Content-Type: text/plain; charset=us-ascii X-SA-Exim-Version: 4.1 (built Tue, 17 Aug 2004 11:06:07 +0200) X-SA-Exim-Scanned: Yes (on eddore) X-OriginalArrivalTime: 06 Oct 2004 01:00:17.0697 (UTC) FILETIME=[D8830110:01C4AB3F] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jeff> I strongly recommend disabling kernel preemption. It is a Jeff> hack that hides bugs. Why do you say that? Preempt seems to be the cleanest way to low latency, and if anything it exposes locking bugs and races rather than hiding anything. Thanks, Roland