From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763091AbZEGUep (ORCPT ); Thu, 7 May 2009 16:34:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763008AbZEGUea (ORCPT ); Thu, 7 May 2009 16:34:30 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:38594 "EHLO www.etchedpixels.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1762824AbZEGUe3 (ORCPT ); Thu, 7 May 2009 16:34:29 -0400 Date: Thu, 7 May 2009 21:34:03 +0100 From: Alan Cox To: Chris Snook Cc: akataria@vmware.com, "H. Peter Anvin" , Ingo Molnar , Thomas Gleixner , "the arch/x86 maintainers" , LKML Subject: Re: [PATCH] x86: Reduce the default HZ value Message-ID: <20090507213403.3a75a6fb@lxorguk.ukuu.org.uk> In-Reply-To: <13a12eea0905071329s79fb262tf89ed901a77726ae@mail.gmail.com> References: <1241462661.412.8.camel@alok-dev1> <4A00ADDE.9000908@zytor.com> <1241560625.8665.17.camel@alok-dev1> <13a12eea0905070935o5abbeb49n8320d06c15b19b56@mail.gmail.com> <1241715373.32495.21.camel@alok-dev1> <13a12eea0905071329s79fb262tf89ed901a77726ae@mail.gmail.com> X-Mailer: Claws Mail 3.7.0 (GTK+ 2.14.7; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > >> Given your use case, what you really need to do is get Red Hat, > >> Novell, et al. on the phone and ask them to ship kernels with HZ=100, > >> because the distributions do their own thing anyway. As a side note Red Hat ships runtime configurable tick behaviour in RHEL these days. HZ is fixed but the ticks can be bunched up. That was done as a quick fix to keep stuff portable but its a lot more sensible than randomly messing with the HZ value and its not much code either.