From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262908AbVGHWMn (ORCPT ); Fri, 8 Jul 2005 18:12:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262926AbVGHWKD (ORCPT ); Fri, 8 Jul 2005 18:10:03 -0400 Received: from smtp.osdl.org ([65.172.181.4]:4792 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S262901AbVGHWIX (ORCPT ); Fri, 8 Jul 2005 18:08:23 -0400 Date: Fri, 8 Jul 2005 15:08:19 -0700 (PDT) From: Linus Torvalds To: Andrew Morton cc: Chris Wedgwood , linux-kernel@vger.kernel.org, christoph@lameter.org Subject: Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt In-Reply-To: <20050708145953.0b2d8030.akpm@osdl.org> Message-ID: References: <200506231828.j5NISlCe020350@hera.kernel.org> <20050708214908.GA31225@taniwha.stupidest.org> <20050708145953.0b2d8030.akpm@osdl.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 8 Jul 2005, Andrew Morton wrote: > > > > The previous value here i386 is 1000 --- so why is the default 250. > > Because 1000 is too high. Yes. I chose 1000 originally partly as a way to make sure that people that assumed HZ was 100 would get a swift kick in the pants. That meant making a _big_ change, not a small subtle one. For example, people tend to react if "uptime" suddenly says the machine has been up for a hundred days (even if it's really only been up for ten), but if it is off by just a factor of two, it might be overlooked. So 1kHz was a bit of an overkill, but it worked well enough that we never really got around to changing it. Linus