Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755710AbXJAWpW (ORCPT ); Mon, 1 Oct 2007 18:45:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751912AbXJAWpL (ORCPT ); Mon, 1 Oct 2007 18:45:11 -0400 Received: from mail1.webmaster.com ([216.152.64.169]:1457 "EHLO mail1.webmaster.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752082AbXJAWpK (ORCPT ); Mon, 1 Oct 2007 18:45:10 -0400 From: "David Schwartz" To: "Ingo Molnar" Cc: Subject: RE: Network slowdown due to CFS Date: Mon, 1 Oct 2007 15:44:09 -0700 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 In-Reply-To: <20071001153529.7c669c7a@laptopd505.fenrus.org> X-Authenticated-Sender: joelkatz@webmaster.com X-Spam-Processed: mail1.webmaster.com, Mon, 01 Oct 2007 15:44:35 -0700 (not processed: message from trusted or authenticated source) X-MDRemoteIP: 206.171.168.138 X-Return-Path: davids@webmaster.com X-MDaemon-Deliver-To: linux-kernel@vger.kernel.org Reply-To: davids@webmaster.com X-MDAV-Processed: mail1.webmaster.com, Mon, 01 Oct 2007 15:44:36 -0700 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 614 Lines: 16 > yielding IS blocking. Just with indeterminate fuzzyness added to it.... Yielding is sort of blocking, but the difference is that yielding will not idle the CPU while blocking might. Yielding is sometimes preferable to blocking in a case where the thread knows it can make forward progress even if it doesn't get the resource. (As in the examples I explained.) DS - 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/