Gigabit performance issues and NFS

Mark Hahn hahn at physics.mcmaster.ca
Mon Jun 2 13:08:40 EDT 2003


> ping before:
>          ----Linux-g.localdomain PING Statistics----
> 5 packets transmitted, 5 packets received, 0.0% packet loss
> round-trip min/avg/max = 0.219/0.286/0.427 ms
> 
> ----Linux-g.localdomain PING Statistics----
> 22889 packets transmitted, 22888 packets received, 0.0% packet loss
> round-trip min/avg/max = 0.202/0.476/2.307 ms
>    2072.5 packets/sec sent, 2072.5 packets/sec received
> 
> --- SGI-g.localdomain ping statistics ---
> 13 packets transmitted, 13 received, 0% loss, time 11993ms
> rtt min/avg/max/mdev = 0.108/0.178/0.230/0.036 ms
> /ping before

uh, that sucks!  here's what I see on a pair of gbe-connected nodes
(dual-xeon/2400, i7500, e1000) on an SMC SMC8624T:

| [hahn at cat48 hahn]$ ping -c100 -q cat47
| PING cat47 (10.0.0.47) from 10.0.0.48 : 56(84) bytes of data.
| 
| --- cat47 ping statistics ---
| 100 packets transmitted, 100 received, 0% loss, time 98998ms
| rtt min/avg/max/mdev = 0.034/0.035/0.046/0.004 ms


and here's two nodes on a (3com 48+2) 100bT switch:

| [root at cat8 root]# ping -c100 -q cat2
| PING cat2 (10.0.0.2) from 10.0.0.8 : 56(84) bytes of data.
| 
| --- cat2 ping statistics ---
| 100 packets transmitted, 100 received, 0% loss, time 98996ms
| rtt min/avg/max/mdev = 0.099/0.101/0.241/0.016 ms


in other words, your network appears to be rather sluggish,
unless I've misunderstood your ping numbers.

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