From: Rene Salmon (rsalmon_at_tulane.edu)
Date: Wed May 11 2005 - 13:07:25 CDT
Hi List,
We are having some strange network problems with CHARM/NAMD on an AMD64
clustermatic 5 cluster.
On nodes that are not running NAMD jobs we this for the network stats
># bpsh 10 netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR
Flg
eth0 1500 0221380022 0 0 0238341193 0 0 0
BMRU
eth1 1500 0 0 0 0 0 0 0 0 0
BMU
lo 16436 0 18 0 0 0 18 0 0 0
LRU
As you can see no error or dropped packets. But on nodes that are running
NAMD Jobs we get this:
># bpsh 4 netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR
Flg
eth0 1500 023182578986 637615860 0 023839814024 1 0
0 BMRU
eth1 1500 0 0 0 0 0 0 0 0 0
BMU
lo 16436 02271084541 0 0 02271084541 0 0
0 LRU
Which shows lots of error and dropped packets. Is this normal? Some how
this is slowing the network down and causing NFS problems.
Any ideas?
Thank you
Rene
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