Date: Mon, 17 Dec 2007 00:52:27 -0500 From: Mark Fullmer <maf@eng.oar.net> To: freebsd-stable@freebsd.org Cc: Jeremy Chadwick <koitsu@freebsd.org> Subject: Re: Packet loss every 30.999 seconds Message-ID: <4EDA6951-C422-4A5C-BB5A-1C292BD8BBFE@eng.oar.net> In-Reply-To: <20071217054305.GA18268@eos.sc1.parodius.com> References: <C921285B-91B3-43BD-B440-128EC60CE815@eng.oar.net> <20071217054305.GA18268@eos.sc1.parodius.com>
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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" >
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