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 1BQ89q-0003dL-SZ for user-mode-linux-devel@lists.sourceforge.net; Tue, 18 May 2004 10:13:38 -0700 Received: from [12.177.129.25] (helo=ccure.user-mode-linux.org) by sc8-sf-mx2.sourceforge.net with esmtp (TLSv1:DES-CBC3-SHA:168) (Exim 4.30) id 1BQ89q-0004hk-6F for user-mode-linux-devel@lists.sourceforge.net; Tue, 18 May 2004 10:13:38 -0700 From: Jeff Dike Subject: Re: [uml-devel] [PATCH] host context switch reduction Message-ID: <20040518175904.GB29114@ccure.user-mode-linux.org> References: <20040229043549.GA8583@ccure.user-mode-linux.org> <02dc01c43c4a$bb7c0490$2000000a@schlepptopp> <1084831251.1230.4.camel@chartreuse> <03ff01c43c5d$7db6e5e0$2000000a@schlepptopp> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <03ff01c43c5d$7db6e5e0$2000000a@schlepptopp> 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: Tue, 18 May 2004 13:59:04 -0400 To: roland Cc: Laurent Vivier , user-mode-linux-devel@lists.sourceforge.net On Tue, May 18, 2004 at 12:22:45AM +0200, roland wrote: > the question is: > is the "real world" performance benefit, uml get`s from this patch worth taking your time and is it implemented in a way, so that > uml maintainers are happy with that ? The patch seems reasonable to me. I'd be happiest with Laurent pushing this into mainline himself. > i cannot really estimate, what performance benefits your patch brings to uml in detail, but what i have seen so far, this seems > quite worth doing the work. reducing context switches by 1/3 is a LOT, imho - and reducing the execution time of the getpid-loop to > nearly the half is quite impressive. Yeah, but no real workloads do while(1) getpid(); The kernel build improvement is obviously smaller, but still worth having. > are there any "con`s" that argue for that work _NOT_ being done ? No. But testing, and happy reports to the appropriate mailing lists would help. 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