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 1BPoIo-0003CR-4n for user-mode-linux-devel@lists.sourceforge.net; Mon, 17 May 2004 13:01:34 -0700 Received: from mail.gmx.net ([213.165.64.20]) by sc8-sf-mx2.sourceforge.net with smtp (Exim 4.30) id 1BPoIn-0008S2-Hg for user-mode-linux-devel@lists.sourceforge.net; Mon, 17 May 2004 13:01:33 -0700 Message-ID: <02dc01c43c4a$bb7c0490$2000000a@schlepptopp> From: "roland" References: <20040229043549.GA8583@ccure.user-mode-linux.org> Subject: Re: [uml-devel] [PATCH] host context switch reduction MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit 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: Mon, 17 May 2004 22:08:33 +0200 To: user-mode-linux-devel@lists.sourceforge.net Cc: LaurentVivier@wanadoo.fr hi ! has this / will this be ported to 2.6 ? have there been made further performance comparisons ? regards roland >Well, we just looked at the context switches. We started 3 UMLs which >were doing a make world for xfree. Without patches the number of >context switches per second was around 60k, with the patch it was around >40k - so it's noticeable, at least from the cs. >Sven ----- Original Message ----- From: "Jeff Dike" To: Sent: Sunday, February 29, 2004 6:35 AM Subject: [uml-devel] [PATCH] host context switch reduction > The patches below are from Laurent Vivier who didn't make them public. They > add a new feature to ptrace on the host which cuts down on the number of > context switches needed for a UML system call, plus makes UML use it. > > There's some interest in this, so I'm putting it out as-is. I haven't played > with it. > > Laurent did some performance testing and found ~40% speedup on a getpid > loop, and a 3.5% speedup on a kernel build. > > Jeff > > ------------------------------------------------------- This SF.Net email is sponsored by: SourceForge.net Broadband Sign-up now for SourceForge Broadband and get the fastest 6.0/768 connection for only $19.95/mo for the first 3 months! http://ads.osdn.com/?ad_id=2562&alloc_id=6184&op=click _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel