From owner-freebsd-hackers@FreeBSD.ORG Fri Jun 4 13:28:41 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 186F316A4CE; Fri, 4 Jun 2004 13:28:41 -0700 (PDT) Received: from multiplay.co.uk (www1.multiplay.co.uk [212.42.16.7]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3F6CB43D1F; Fri, 4 Jun 2004 13:28:38 -0700 (PDT) (envelope-from killing@multiplay.co.uk) Received: from vader ([212.135.219.179]) by multiplay.co.uk (multiplay.co.uk [212.42.16.7]) (MDaemon.PRO.v7.1.0.R) with ESMTP id md50000263262.msg; Fri, 04 Jun 2004 21:21:11 +0100 Message-ID: <00fb01c44a71$c7f26d10$b3db87d4@multiplay.co.uk> From: "Steven Hartland" To: "Robert Watson" , "Ali Niknam" References: Date: Fri, 4 Jun 2004 21:23:17 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Spam-Processed: multiplay.co.uk, Fri, 04 Jun 2004 21:21:11 +0100 (not processed: message from valid local sender) X-MDRemoteIP: 212.135.219.179 X-Return-Path: killing@multiplay.co.uk X-MDAV-Processed: multiplay.co.uk, Fri, 04 Jun 2004 21:21:12 +0100 cc: freebsd-hackers@freebsd.org Subject: Re: FreeBSD 5.2.1: Mutex/Spinlock starvation? 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: Fri, 04 Jun 2004 20:28:41 -0000 ----- Original Message ----- From: "Robert Watson" > You might want to try adding "options ADAPTIVE_MUTEXES" to your kernel > configuration, which will cause mutexes to spin briefly on SMP systems > before sleeping, and has been observed to improve performance quite a bit. Thats very interesting is there a specific set off conditions where it would pay off that you guys know of or is it more a try it and see? We run ~ 100 dual machines here the vast majority FreeBSD as game servers and would consider upgrading the kernels if you thought it would help. Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137 or return the E.mail to postmaster@multiplay.co.uk.