From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751261AbVH2SND (ORCPT ); Mon, 29 Aug 2005 14:13:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751269AbVH2SND (ORCPT ); Mon, 29 Aug 2005 14:13:03 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:11664 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S1751261AbVH2SNB (ORCPT ); Mon, 29 Aug 2005 14:13:01 -0400 Subject: Re: 2.6.13 new option timer frequency From: Lee Revell To: Nick Warne Cc: linux-kernel@vger.kernel.org In-Reply-To: <200508291857.15746.nick@linicks.net> References: <200508291857.15746.nick@linicks.net> Content-Type: text/plain Date: Mon, 29 Aug 2005 14:12:56 -0400 Message-Id: <1125339176.4598.51.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.3.8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2005-08-29 at 18:57 +0100, Nick Warne wrote: > Hi all, > > I built and installed 2.6.13 today, and oldconfig revealed the new option for > timer frequency. > > I searched the LKML on this, but all I found is the technical stuff - not > really any layman solutions. > > Two n00b questions here: > > What does this do/what is it for? > Selects the frequency of the timer interrupt. This controls the timing resolution of system calls. So previously poll/select could be used with a 1ms timeout. Now with the default settings it can only do 4ms. > I selected default, 250Hz. If this is now an option, what was it before? The previous value was 1000HZ. And yes, changing the default from 1000 to 250 breaks the expected "make oldconfig" behavior. Lots of people are not happy about it, but were overruled by Linus. Lee