From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1BCHbL-0005Mi-5J for user-mode-linux-devel@lists.sourceforge.net; Sat, 10 Apr 2004 05:28:47 -0700 Received: from smtp001.mail.ukl.yahoo.com ([217.12.11.32]) by sc8-sf-mx2.sourceforge.net with smtp (Exim 4.30) id 1BCHbK-0004ie-DO for user-mode-linux-devel@lists.sourceforge.net; Sat, 10 Apr 2004 05:28:46 -0700 From: BlaisorBlade Subject: Re: [uml-devel] uml responsivenes or "AS vs DEADLINE Scheduler on uml-host" - was: [uml-user] Network lags References: <200404091626.i39GQqsf002414@ccure.user-mode-linux.org> <195901c41e61$3132cb90$2000000a@schlepptopp> In-Reply-To: <195901c41e61$3132cb90$2000000a@schlepptopp> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Message-Id: <200404101428.36306.blaisorblade_spam@yahoo.it> Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Sat, 10 Apr 2004 14:28:36 +0200 Content-Transfer-Encoding: quoted-printable To: roland , Jeff Dike Cc: Joern Bredereck , user-mode-linux-user@lists.sourceforge.net, user-mode-linux-devel@lists.sourceforge.net, mingo@elte.hu Alle 20:33, venerd=EC 9 aprile 2004, roland ha scritto: > Hi ! > I think i found an interesting "scheduling issue" which led me to switch > the subject of the thread. 1) Well, you switched from AS to deadline and got a significant IO performa= nce=20 improvement, which made UML faster since it was Disk-bound. The problem wit= h=20 AS is that it uses an heuristic, which assumes sequential reads. But "find /" is very seeky, so it is slow with AS. So if you remove this bg= =20 thread, you should get significantly different results. Also, AS has had some changes in later kernels, so you should probably upgr= ade=20 your host kernel to the latest version. A security hole (a local exploit to= =20 become root) has also been fixed after 2.6.0. 2) In your last email, you speak about hogging the UML CPU. If Jeff guessed= =20 correctly what happens, then avoiding that UML is idle will decrease the=20 worst-case ping response times. --=20 Paolo Giarrusso, aka Blaisorblade Linux registered user n. 292729 ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id638&op=CCk _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel