From owner-freebsd-stable@FreeBSD.ORG Mon Dec 17 05:52:38 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 104B516A469 for ; Mon, 17 Dec 2007 05:52:38 +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 BF21813C468 for ; Mon, 17 Dec 2007 05:52:37 +0000 (UTC) (envelope-from maf@eng.oar.net) Received: (qmail 40383 invoked from network); 17 Dec 2007 05:52:37 -0000 Received: from dev1.eng.oar.net (HELO ?127.0.0.1?) (192.148.251.71) by sv1.eng.oar.net with SMTP; 17 Dec 2007 05:52:37 -0000 In-Reply-To: <20071217054305.GA18268@eos.sc1.parodius.com> References: <20071217054305.GA18268@eos.sc1.parodius.com> Mime-Version: 1.0 (Apple Message framework v752.3) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <4EDA6951-C422-4A5C-BB5A-1C292BD8BBFE@eng.oar.net> Content-Transfer-Encoding: 7bit From: Mark Fullmer Date: Mon, 17 Dec 2007 00:52:27 -0500 To: freebsd-stable@freebsd.org X-Mailer: Apple Mail (2.752.3) Cc: Jeremy Chadwick 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: Mon, 17 Dec 2007 05:52:38 -0000 I'm about 99% sure right now. I'll set this up in a lab tomorrow without an ethernet switch. It takes about a day of uptime before the problem shows up. Sorry for the duplicate messages, I misread a bounce notification. -- mark On Dec 17, 2007, at 12:43 AM, Jeremy Chadwick wrote: > On Mon, Dec 17, 2007 at 12:21:43AM -0500, Mark Fullmer wrote: >> While trying to diagnose a packet loss problem in a RELENG_6 >> snapshot dated >> November 8, 2007 it looks like I've stumbled across a broken >> driver or >> kernel routine which stops interrupt processing long enough to >> severly >> degrade network performance every 30.99 seconds. >> >> Packets appear to make it as far as ether_input() then get lost. > > Are you sure this isn't being caused by something the switch is doing, > such as MAC/ARP cache clearing or LACP? I'm just speculating, but it > would be worthwhile to remove the switch from the picture (crossover > cable to the rescue). > > I know that at least in the case of fxp(4) and em(4), Jack Vogel does > some through testing of throughput using a professional/high-end > packet > generator (some piece of hardware, I forget the name...) > > -- > | Jeremy Chadwick jdc at > parodius.com | > | Parodius Networking http:// > www.parodius.com/ | > | UNIX Systems Administrator Mountain View, > CA, USA | > | Making life hard for others since 1977. PGP: > 4BD6C0CB | > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable- > unsubscribe@freebsd.org" >