Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262870AbVEHNok (ORCPT ); Sun, 8 May 2005 09:44:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262872AbVEHNok (ORCPT ); Sun, 8 May 2005 09:44:40 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:9160 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S262870AbVEHNoe (ORCPT ); Sun, 8 May 2005 09:44:34 -0400 Subject: Re: [RFC] (How to) Let idle CPUs sleep From: Arjan van de Ven To: Andi Kleen Cc: vatsa@in.ibm.com, schwidefsky@de.ibm.com, jdike@addtoit.com, Andrew Morton , Ingo Molnar , Nick Piggin , rmk+lkml@arm.linux.org.uk, linux-kernel@vger.kernel.org, user-mode-linux-devel@lists.sourceforge.net In-Reply-To: References: <20050507182728.GA29592@in.ibm.com> <1115524211.17482.23.camel@localhost.localdomain> <1115547230.5998.10.camel@laptopd505.fenrus.org> Content-Type: text/plain Date: Sun, 08 May 2005 15:44:14 +0200 Message-Id: <1115559855.5998.26.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 (2.0.4-4) Content-Transfer-Encoding: 7bit X-Spam-Score: 3.7 (+++) X-Spam-Report: SpamAssassin version 2.63 on pentafluge.infradead.org summary: Content analysis details: (3.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 1.1 RCVD_IN_DSBL RBL: Received via a relay in list.dsbl.org [] 2.5 RCVD_IN_DYNABLOCK RBL: Sent directly from dynamic IP address [80.57.133.107 listed in dnsbl.sorbs.net] 0.1 RCVD_IN_SORBS RBL: SORBS: sender is listed in SORBS [80.57.133.107 listed in dnsbl.sorbs.net] 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 Content-Length: 612 Lines: 14 > But it has to be *really* lightweight because these transistion can > happen a lot (consider a CPU that very often goes to sleep for a short time) lightweight is good of course. But even if it's medium weight.. it just means you need to be REALLY idle (eg for longer time) for it to trigger. I guess we need some sort of per arch "idleness threshhold" for this. - 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/