Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755371AbZISOy4 (ORCPT ); Sat, 19 Sep 2009 10:54:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752130AbZISOyy (ORCPT ); Sat, 19 Sep 2009 10:54:54 -0400 Received: from casper.infradead.org ([85.118.1.10]:57295 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751642AbZISOyy (ORCPT ); Sat, 19 Sep 2009 10:54:54 -0400 Date: Sat, 19 Sep 2009 16:55:01 +0200 From: Arjan van de Ven To: Daniel J Blueman Cc: Linux Kernel Subject: Re: tickless and HZ=1000 throughput advantage? Message-ID: <20090919165501.65d77294@infradead.org> In-Reply-To: <6278d2220909190747n62f7036dj2e5231fcdc4730fb@mail.gmail.com> References: <6278d2220909190747n62f7036dj2e5231fcdc4730fb@mail.gmail.com> Organization: Intel X-Mailer: Claws Mail 3.7.2 (GTK+ 2.14.7; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 916 Lines: 23 On Sat, 19 Sep 2009 15:47:24 +0100 Daniel J Blueman wrote: > On tickless kernels, is the general consensus that for non-embedded > systems, selecting HZ=1000 gives slightly more throughput in > particular situations than HZ=100 or 250, due to finer timer > intervals/granularity? it's not about throughput. It's about latency for some things.... although now that select/poll and co use hrtimers it's not as critical anymore. the HZ timers aren't used much for anything time-critical nowadays. -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- 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/