From owner-freebsd-current@FreeBSD.ORG Tue Oct 19 21:50:52 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A1CE516A4CE for ; Tue, 19 Oct 2004 21:50:52 +0000 (GMT) Received: from fledge.watson.org (fledge.watson.org [204.156.12.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3D95E43D2F for ; Tue, 19 Oct 2004 21:50:52 +0000 (GMT) (envelope-from robert@fledge.watson.org) Received: from fledge.watson.org (localhost [127.0.0.1]) by fledge.watson.org (8.13.1/8.13.1) with ESMTP id i9JLoff6082203; Tue, 19 Oct 2004 17:50:41 -0400 (EDT) (envelope-from robert@fledge.watson.org) Received: from localhost (robert@localhost)i9JLofvh082200; Tue, 19 Oct 2004 17:50:41 -0400 (EDT) (envelope-from robert@fledge.watson.org) Date: Tue, 19 Oct 2004 17:50:41 -0400 (EDT) From: Robert Watson X-Sender: robert@fledge.watson.org To: Andrew Gallatin In-Reply-To: <16757.34627.710821.812489@grasshopper.cs.duke.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-current@freebsd.org Subject: Re: mbuf leak with SMP and debug.mpsafenet=1 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 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: Tue, 19 Oct 2004 21:50:52 -0000 On Tue, 19 Oct 2004, Andrew Gallatin wrote: > I hooked up the em0 GbE interfaces, and that leaks nearly as bad as my > myrinet nic (at least with a linux sender, hooked back-to-back). Em0 > seems to be leaking at a few thoundsand pkts/sec, so I wasn't brave > enough to do a long run.. Oh, I just had a thought. Could you try this patch (perhaps with tweaks to apply to recent kernels): http://www.watson.org/~robert/freebsd/netperf/20040910-atomic-mballoc.diff I ran with this change in the netperf branch for quite a long time, but never managed to trigger sufficient races on the allocator to result in the counters getting off by more than a couple. However, the reason I updated the patch and put it on the netperf page was that Bill Paul reported seeing fairly hefty stats errors on an SMP box at gig-e rates, and when he tried the patch it went away. It would be useful if you could try the patch to make sure that we're looking at a real mbuf leak and not an mbuf stat leak. Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Research