Page 3 of Jason's switch memo at http://casper.berkeley.edu/memos/switch_configuration.pdf has the commands to enable jumbo frame on some of the Fujitsu switches.
Peter -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dan Werthimer Sent: Tuesday, November 24, 2009 3:34 PM To: John Ford Cc: [email protected] Subject: Re: [casper] 10 GBe Switch weirdness hi john, i vaguely remember that there's a command you need to issue to the fujitsu switches to enable jumbo packets ?? jason will know. dan On 11/24/2009 02:01 PM, John Ford wrote: > Hi all. We've been running GUPPI for some time now with a direct > connection from our bee2, "bee2" to our host, "beef". Works fine, no > dropped packets, etc. Life's fine. > > To build our next machine, GUPPI-2, we decided to insert a Fujitsu > XG-2000C switch between them, and now we are losing packets. Same > hardware, same software, except the switch is now between the bee2 and the > host. We have very short cables on all the ports. 1 meter or 0.5 meter. > Changing cables had no effect. Changing switch ports had no effect. The > ports are set to use jumbo packets. Moving the cable from the switch back > to the host fixes the problems, and it all magically works again. > > Other hosts on the 10 gbe network do not seem to suffer from packet loss. > The switch's monitoring screens do not show any packet loss in the switch. > > Does the switch do anything to the timing of the packets? Any ideas about > incompatible NIC's? They are all myricom pcie cards. > > Any other ideas? > > John > > >
