From owner-freebsd-stable@FreeBSD.ORG Wed Dec 19 17:07:23 2007 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7E71616A4E9 for ; Wed, 19 Dec 2007 17:07:23 +0000 (UTC) (envelope-from maf@eng.oar.net) Received: from sv1.eng.oar.net (sv1.eng.oar.net [192.148.251.86]) by mx1.freebsd.org (Postfix) with SMTP id 1E81F13C45D for ; Wed, 19 Dec 2007 17:07:17 +0000 (UTC) (envelope-from maf@eng.oar.net) Received: (qmail 43387 invoked from network); 19 Dec 2007 17:07:17 -0000 Received: from dev1.eng.oar.net (HELO ?127.0.0.1?) (192.148.251.71) by sv1.eng.oar.net with SMTP; 19 Dec 2007 17:07:17 -0000 In-Reply-To: <20071220011626.U928@besplex.bde.org> References: <20071217102433.GQ25053@tnn.dglawrence.com> <20071220011626.U928@besplex.bde.org> Mime-Version: 1.0 (Apple Message framework v752.3) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <814DB7A9-E64F-4BCA-A502-AB5A6E0297D3@eng.oar.net> Content-Transfer-Encoding: 7bit From: Mark Fullmer Date: Wed, 19 Dec 2007 12:06:59 -0500 To: Bruce Evans X-Mailer: Apple Mail (2.752.3) Cc: freebsd-net@freebsd.org, freebsd-stable@freebsd.org Subject: Re: Packet loss every 30.999 seconds X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Dec 2007 17:07:23 -0000 On Dec 19, 2007, at 9:54 AM, Bruce Evans wrote: > On Tue, 18 Dec 2007, Mark Fullmer wrote: > >> A little progress. >> >> I have a machine with a KTR enabled kernel running. >> >> Another machine is running David's ffs_vfsops.c's patch. >> >> I left two other machines (GENERIC kernels) running the packet >> loss test >> overnight. At ~ 32480 seconds of uptime the problem starts. This >> is really > > Try it with "find / -type f >/dev/null" to duplicate the problem > almost > instantly. I was able to verify last night that (cd /; tar -cpf -) > all.tar would trigger the problem. I'm working getting a test running with David's ffs_sync() workaround now, adding a few counters there should get this narrowed down a little more. Thanks for the other info on timer resolution, I overlooked clock_gettime(). -- mark