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.
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 ?
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,
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,
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: casper-boun...@lists.berkeley.edu
[mailto:casper-boun...@lists.berkeley.edu] On Behalf Of Dan
Hey guys,
Jumbo frames are already enabled on the switch. The packet loss we're
seeing is about 0.1%, so most of the data is making it through. The weird
thing is that this number seems independent of the data rate. Even at 1
MB/s we still lose 0.1% of the data.
As John already said,
Matt and I have had problems with BEE2 - switch with short cables. The
lanes lose sync, and then take a fixed time to resync. Data is lost
during this process, hence the losses are higher at higher datarates.
With lower rates, it is able to buffer the data and resume without
significant
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