From owner-freebsd-hackers@FreeBSD.ORG Sat Jan 31 15:36:13 2004 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 320AF16A4CE for ; Sat, 31 Jan 2004 15:36:13 -0800 (PST) Received: from rwcrmhc11.comcast.net (rwcrmhc11.comcast.net [204.127.198.35]) by mx1.FreeBSD.org (Postfix) with ESMTP id 324D343D3F for ; Sat, 31 Jan 2004 15:36:00 -0800 (PST) (envelope-from julian@elischer.org) Received: from interjet.elischer.org ([24.7.73.28]) by comcast.net (rwcrmhc11) with ESMTP id <20040131233559013009u1m4e>; Sat, 31 Jan 2004 23:35:59 +0000 Received: from localhost (localhost.elischer.org [127.0.0.1]) by InterJet.elischer.org (8.9.1a/8.9.1) with ESMTP id PAA47484; Sat, 31 Jan 2004 15:35:58 -0800 (PST) Date: Sat, 31 Jan 2004 15:35:57 -0800 (PST) From: Julian Elischer To: Milo Hyson In-Reply-To: <1075588419.43166.6.camel@beastie.lab.cyberlifelabs.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-hackers@freebsd.org Subject: Re: Weird context-switching performance X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 31 Jan 2004 23:36:13 -0000 On Sat, 31 Jan 2004, Milo Hyson wrote: > We've got these two very similar machines that are exhibiting > drastically different context-switching performance. The slower of the > two is actually task-switching at four times the rate of the other. > We've gone through several benchmarks and are at a complete loss to > explain it. We've set up a page documenting our efforts: > > http://www.cyberlifelabs.com/cs-benchmark/ > > I would appreciate it if someone could offer some insight into what > affects context-switching. Is there some obscure kernel variable that > we've overlooked? Or is it just one of those unexplainable feng-shui > situations? > Which is the abnormal machine? i.e. is machine 1 faster than all other similar machines or is machine B slower? > Thanks in advance. > > -- > Milo Hyson > Chief "Mad" Scientist > CyberLife Labs, LLC > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >