From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1IkRPx-0003o6-Tl for user-mode-linux-devel@lists.sourceforge.net; Tue, 23 Oct 2007 14:36:06 -0700 Received: from saraswathi.solana.com ([198.99.130.12]) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1IkRPw-0002QS-NT for user-mode-linux-devel@lists.sourceforge.net; Tue, 23 Oct 2007 14:36:05 -0700 Date: Tue, 23 Oct 2007 17:35:45 -0400 From: Jeff Dike Message-ID: <20071023213545.GA11026@c2.user-mode-linux.org> References: <1f154f440710161936h4800b0c5nb3140ff504212625@mail.gmail.com> <20071017155504.GD9497@c2.user-mode-linux.org> <1f154f440710170916j4fdb857fw40c9b2fd2b66f63f@mail.gmail.com> <20071017171920.GA10388@c2.user-mode-linux.org> <1f154f440710171243x40898f8bq386c91c59789fb42@mail.gmail.com> <20071017204527.GB12812@c2.user-mode-linux.org> <1f154f440710171629meb5a3ces92b8fdeacc371857@mail.gmail.com> <20071018200432.GA9204@c2.user-mode-linux.org> <1f154f440710231221r76d63ec2h640e95c7afa05a6a@mail.gmail.com> Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: <1f154f440710231221r76d63ec2h640e95c7afa05a6a@mail.gmail.com> Subject: Re: [uml-devel] Dramatic drop in C3 state residency with NO_HZ patches List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: user-mode-linux-devel-bounces@lists.sourceforge.net Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net To: Hrishikesh Cc: user-mode-linux-devel@lists.sourceforge.net On Tue, Oct 23, 2007 at 04:21:03PM -0300, Hrishikesh wrote: > Yes, that double negative was a slipup. I did get some numbers out and they > look pretty good. I ran upto 5 instances of UML simultaneously and in the > tickful case, each instance adds roughly about 100 wakeups per second. HZ == 100, so that makes sense. > So > after 5 instances, C3 residency comes down to about 95% when all the > instances are simply idling. With NO_HZ applied, the change is minimal with > C3 residency still approximately 98%. UML is not even among the top three of > the bad-list of wakers-up :-) Cool. I'm suprised that 500 wakeups/sec only brings you down < 5%. So, things are good, except I need to figure out the !NO_HZ busy loop. Jeff -- Work email - jdike at linux dot intel dot com ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel