From owner-freebsd-current@FreeBSD.ORG Fri May 2 19:18:06 2008 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6B2C91065673 for ; Fri, 2 May 2008 19:18:06 +0000 (UTC) (envelope-from gnn@neville-neil.com) Received: from proxy.meer.net (proxy.meer.net [64.13.141.13]) by mx1.freebsd.org (Postfix) with ESMTP id A58428FC15 for ; Fri, 2 May 2008 19:18:05 +0000 (UTC) (envelope-from gnn@neville-neil.com) Received: from mail.meer.net (mail.meer.net [64.13.141.3]) by proxy.meer.net (8.14.2/8.14.2) with ESMTP id m42Ip1xX074537; Fri, 2 May 2008 11:51:01 -0700 (PDT) (envelope-from gnn@neville-neil.com) Received: from mail2.meer.net (mail2.meer.net [64.13.141.16]) by mail.meer.net (8.13.3/8.13.3/meer) with ESMTP id m42IoNto058243; Fri, 2 May 2008 11:50:23 -0700 (PDT) (envelope-from gnn@neville-neil.com) Received: from minion.local.neville-neil.com (75-165-113-125.tukw.qwest.net [75.165.113.125]) (authenticated bits=0) by mail2.meer.net (8.14.1/8.14.1) with ESMTP id m42IoNJZ082906; Fri, 2 May 2008 11:50:23 -0700 (PDT) (envelope-from gnn@neville-neil.com) Date: Fri, 02 May 2008 11:50:22 -0700 Message-ID: From: gnn@freebsd.org To: Andrew Snow In-Reply-To: <48195384.5030204@modulus.org> References: <20080501045736.GU30325@elvis.mu.org> <48195384.5030204@modulus.org> User-Agent: Wanderlust/2.15.5 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?ISO-8859-4?Q?Goj=F2?=) APEL/10.7 Emacs/22.1.50 (i386-apple-darwin8.11.1) MULE/5.0 (SAKAKI) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII X-Canit-CHI2: 0.50 X-Bayes-Prob: 0.5 (Score 0, tokens from: ) X-Spam-Score: 0.10 () [Tag at 5.00] COMBINED_FROM X-CanItPRO-Stream: default X-Canit-Stats-ID: 200300 - 4f3ff182e9c1 X-Scanned-By: CanIt (www . roaringpenguin . com) on 64.13.141.13 Cc: Alfred Perlstein , freebsd-current@freebsd.org Subject: Re: Some odd behaviour of vmstat and vmtotal... X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 May 2008 19:18:06 -0000 At Thu, 01 May 2008 15:22:12 +1000, Andrew Snow wrote: > > > > In deploying 7.0 at work we were finding a persistent problem when > > running "vmstat 1" on systems. The problem shows up as a 10ms "pause" > > in processing, usually packet stamping and forwarding by a user level > > process. > > Thats interesting. I once did some quick and dirty profiling of vmtotal > and found it runs extremely quickly. Are you running on slow machines > (embedded perhaps)? Or do you have a situation where you perhaps have > alot more VM objects created than normal? I can't think of a good > example where this would be the case.. > Doing a buildworld will cause you to see this. It's all about how many vm objects are on the list. Best, George