From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Link bouncing with multiple drivers. Date: Mon, 12 Oct 2009 10:55:58 -0700 Message-ID: <4AD36DAE.8070908@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: NetDev Return-path: Received: from mail.candelatech.com ([208.74.158.172]:56631 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932849AbZJLR4f (ORCPT ); Mon, 12 Oct 2009 13:56:35 -0400 Received: from [192.168.100.195] (firewall.candelatech.com [70.89.124.249]) (authenticated bits=0) by ns3.lanforge.com (8.14.2/8.14.2) with ESMTP id n9CHtwxM031822 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 12 Oct 2009 10:55:59 -0700 Sender: netdev-owner@vger.kernel.org List-ID: I have a strange issue: In several different scenarios, when we run pktgen at line speed on 1G through our proprietary bridge-ish module, we see link go up and down every minute or so. This happens with e1000, e1000e, and have also seen it on ixgbe (though not line speed here...but we were driving it as hard as the systems could handle). We cannot reproduce this when a normal bridge is substituted for our proprietary module, so it must either be a bug in our code somewhere, or something to do with the fact that our module causes more work to be done than a bridge (backed up driver queues on rx/tx, time-stamps, etc). Since it happens across multiple drivers and hardware (and operating systems: F5, F8, F11, but all with kernels based on 2.6.31), it must be some general issue. If anyone has any ideas where I should start poking, I would be grateful. For now, I'm off to dig in the e1000e code... Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com