From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264059AbTE0TuF (ORCPT ); Tue, 27 May 2003 15:50:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264062AbTE0TuE (ORCPT ); Tue, 27 May 2003 15:50:04 -0400 Received: from gateway-1237.mvista.com ([12.44.186.158]:44531 "EHLO av.mvista.com") by vger.kernel.org with ESMTP id S264059AbTE0TuD (ORCPT ); Tue, 27 May 2003 15:50:03 -0400 Message-ID: <3ED3C433.6020002@mvista.com> Date: Tue, 27 May 2003 13:01:55 -0700 From: george anzinger User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2) Gecko/20021202 X-Accept-Language: en-us, en MIME-Version: 1.0 To: davidm@hpl.hp.com CC: Andrew Morton , Richard C Bilson , linux-kernel@vger.kernel.org, Eric Piel , Ulrich Windl Subject: Re: setitimer 1 usec fails References: <20030526142555.67a79694.akpm@digeo.com> <3ED28E95.6000701@mvista.com> <16083.44589.855335.531141@napali.hpl.hp.com> In-Reply-To: <16083.44589.855335.531141@napali.hpl.hp.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org David Mosberger wrote: >>>>>>On Mon, 26 May 2003 15:00:53 -0700, george anzinger said: > > > George> As a test, you might try your test with HZ=1000 (a number I > George> recommend for ia64, if at all possible). > > I suspect you might have a slightly biased view on this. ;-) Yes, > HZ=1000 makes some problems easier to convert ticks to real time, but > slower to convert real time to ticks. Ulrich has written something on this. Maybe he could comment :) -g > > Besides, the Linux kernel MUST work with (fairly) arbitrary HZ values, > because some platforms just don't have much of a choice (e.g., Alpha > is pretty much forced to 1024Hz). > > But, yes, on ia64 we can choose HZ to our liking. If someone presents > evidence that shows a real benefit for a value other than 1024, I'm > certainly willing to listen. > > --david > > -- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml