Date: Fri, 6 Nov 2009 08:40:02 GMT From: Maxim Sobolev <sobomax@FreeBSD.org> To: freebsd-net@FreeBSD.org Subject: Re: kern/140326: em0: watchdog timeout when communicating to windows using 9K MTU Message-ID: <200911060840.nA68e2bl035948@freefall.freebsd.org>
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The following reply was made to PR kern/140326; it has been noted by GNATS. From: Maxim Sobolev <sobomax@FreeBSD.org> To: Jack Vogel <jfvogel@gmail.com> Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: kern/140326: em0: watchdog timeout when communicating to windows using 9K MTU Date: Fri, 06 Nov 2009 00:30:33 -0800 Jack Vogel wrote: > Good, that's a start. Now, is there a switch of some sort involved or > are you going > back to back? Some switches have problems with jumbo frames, there are also > some vendors (including our's) interfaces that do not support jumbo > frames, so > you need to check on that also (I mean the RT). > > I will check on the Intel adapter tomorrow. Yes, there is switch involved (Cisco/Linksys EG008W ver.3), but I don't think it's related. The problem has really escalated when I installed Windows 7 on this machine yesterday. Before that the same machine with Realtek was running Vista and this problem had happened to me only once or twice in two weeks with the same MTU on both ends. And from the capture it seems like the very specific condition causes this. Unfortunately this box is a gateway for a network, so that I cannot replace hub and try to reproduce the issue. -Maxim
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