From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932459AbWGLWBS (ORCPT ); Wed, 12 Jul 2006 18:01:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932462AbWGLWBS (ORCPT ); Wed, 12 Jul 2006 18:01:18 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:12423 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S932459AbWGLWBR (ORCPT ); Wed, 12 Jul 2006 18:01:17 -0400 Subject: Re: [PATCH] Use uname not sysctl to get the kernel revision From: Arjan van de Ven To: "Eric W. Biederman" Cc: "H. Peter Anvin" , Jakub Jelinek , Ulrich Drepper , Roland McGrath , "Randy.Dunlap" , akpm@osdl.org, linux-kernel@vger.kernel.org, libc-alpha@sourceware.org In-Reply-To: References: <20060712184412.2BD57180061@magilla.sf.frob.com> <44B54EA4.5060506@redhat.com> <20060712195349.GW3823@sunsite.mff.cuni.cz> <44B556E5.5000702@zytor.com> <1152739766.3217.83.camel@laptopd505.fenrus.org> Content-Type: text/plain Date: Thu, 13 Jul 2006 00:01:05 +0200 Message-Id: <1152741665.3217.85.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > It is a short busy wait before falling asleep. I assume you mean > busy wait is a loss even on SMP? eh yeah I forgot to think for a second. But yes even for SMP busy wait is pretty bad power wise nowadays.. at least if you wait more than a few hundred cycles. (and if you wait less... then it's almost unlikely that it'll be useful as well)