Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 7 Oct 2002 12:53:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 7 Oct 2002 12:53:26 -0400 Received: from e32.co.us.ibm.com ([32.97.110.130]:11766 "EHLO e32.co.us.ibm.com") by vger.kernel.org with ESMTP id ; Mon, 7 Oct 2002 12:53:25 -0400 Message-ID: <3DA1BD51.6040003@us.ibm.com> Date: Mon, 07 Oct 2002 09:58:57 -0700 From: Dave Hansen User-Agent: Mozilla/5.0 (compatible; MSIE5.5; Windows 98; X-Accept-Language: en-us, en MIME-Version: 1.0 To: Alan Cox CC: Linux Kernel Mailing List Subject: Re: [RFC][PATCH] HZ as a config option References: <3D9E1BEA.7060804@us.ibm.com> <1033779196.1335.8.camel@irongate.swansea.linux.org.uk> 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 Content-Length: 906 Lines: 26 Alan Cox wrote: > On Fri, 2002-10-04 at 23:53, Dave Hansen wrote: > >>On large systems (like NUMA-Q, Intel Profusion, etc...), latency and >>user responsiveness become much less important. The extra scheduling >>overhead caused by higher HZ is bad. >> >>This is x86-only right now. Is there any wider desire to tune this at >>config time? Do any architecutures have strict rules as to what this >>can be set to? > > You can't set this arbitarily, the NTP PLL's will only lock for certain > value ranges. Where can I find these ranges? include/linux/timex.h only errors if the number is out of the 12-1535 range. -- Dave Hansen haveblue@us.ibm.com - 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/