From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757338Ab1CaLNn (ORCPT ); Thu, 31 Mar 2011 07:13:43 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:44760 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751965Ab1CaLNm (ORCPT ); Thu, 31 Mar 2011 07:13:42 -0400 Date: Thu, 31 Mar 2011 13:13:23 +0200 From: Ingo Molnar To: Avi Kivity Cc: Robin Holt , Thomas Gleixner , Yinghai Lu , Andi Kleen , linux-kernel@vger.kernel.org, Ingo Molnar , Alan Cox Subject: Re: [RFC 2/2] Make x86 calibrate_delay run in parallel. Message-ID: <20110331111323.GA24672@elte.hu> References: <20101215015840.390204279@gulag1.americas.sgi.com> <20101215015849.051095242@gulag1.americas.sgi.com> <20110331065036.GC5938@elte.hu> <20110331065805.GG5938@elte.hu> <20110331093723.GE24046@sgi.com> <20110331095705.GA23319@elte.hu> <4D9457BF.1040601@redhat.com> <20110331104601.GA8577@elte.hu> <4D945C4D.5090104@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4D945C4D.5090104@redhat.com> User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Avi Kivity wrote: > How important is udelay() for hardware timing these days, btw? Seems popular enough: earth4:~/tip> git grep -w udelay drivers/ | wc -l 4843 And while it's probably less important than it used to be, we cannot really know for sure. This is one of the rare occasions where some modest amount of fear, uncertainty and doubt is justified. Thanks, Ingo