> Did you try longer (lossier) copper cables between BEE2 and switch ? > by longer I'm thinking say 2 or 3 meters. > > Did you try active copper or fiber optic cables ?
No on both counts. I do have some longer copper cables. It never occurred to me to try them. I will try at the next opportunity, which isn't till next week. You sound as though you've seen this before. :) John > > On Tue, 24 Nov 2009, 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 >> >> >> >> >
