From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alvin Starr Subject: Re: vif tx drops Date: Fri, 15 Oct 2004 09:09:45 -0400 Sender: xen-devel-admin@lists.sourceforge.net Message-ID: <416FCC19.304@Iplink.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Ian Pratt Cc: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org Ian Pratt wrote: >>It looks like xen0 or the bridge stuff is not getting some packets >>destined for xenU. >> >>I traced an ssh connection from a machine running stock 2.4.25 >>to a xenU domain by running tcpdump on xen0 and on the other machine. >> >>The trace on xen0 shows a 4 second gap where no ssh packets were received >>for the xenU domain even though the other machine was sending retransmits. >>Only the last retransmit appears in the xen0 dump. >> >>On xen0, tcpdump -i eth0 shows the 4 second gap between packets >> >> >going to xenU: > > >If they're not showing up here, then I think we can rule out >anything to do with the bridge code as we're looking before the >bridge. > >In fact, its hard to see how they could be dropped by anything >other than the driver, and you'd expect to see the dropped count >bumped. What driver is this? > >Even if something (e.g. Xen) went wild and took the CPU away for >4 seconds, you'd wouldn't expect to loose packets as the NIC >would buffer them. > >I'll place money that you've still got some duplicate MAC >addresses out there... > >Ian > > I am seeing a similar thing with only one xenU domain running. The thing is that I am trying to run an ISCSI net boot. I have much bigger problems just now so I have not had a chance to look at what is going on with the dropped packets. But I am sure I do not have an issue with a duplicate mac address. I do now believe anybody sihpps with a mac address of aa:00:00:00:00:0X where X is 1,2 or 3. -- Alvin Starr || voice: (416)585-9971 Interlink Connectivity || fax: (416)785-3668 alvin@iplink.net || ------------------------------------------------------- This SF.net email is sponsored by: IT Product Guide on ITManagersJournal Use IT products in your business? Tell us what you think of them. Give us Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more http://productguide.itmanagersjournal.com/guidepromo.tmpl