Lousy Network Performance

[Kurt Wall]

On Mon, Jun 27, 2005 at 09:08:44PM -0700, Net Llama! took 0 lines to write:
> On 06/27/2005 07:56 PM, Kurt Wall wrote:
> >Hi, list,
> >
> >How do I go about solving a significant latency problem on my
> >internal network. I have two computers connected via a crossover
> >cable, eth1 on the "server" (luther) to eth0 on the "desktop"
> >(easter). Both cards are 10/100. Ping time is atrocious:
> >
> >From luther to easter:
> >$ ping -c 10 easter
[...]
> >--- easter ping statistics ---
> >10 packets transmitted, 10 received, 0% packet loss, time 9071ms
> >rtt min/avg/max/mdev = 0.694/480.691/979.699/455.463 ms
> >
> >From easter to luther:
> >$ ping -c 10 luther
[...]
> >--- luther ping statistics ---
> >10 packets transmitted, 10 received, 0% packet loss, time 9002ms
> >rtt min/avg/max/mdev = 0.418/597.109/1194.010/522.194 ms, pipe 3
> >
> >I can't see any reason why the latency should be so extreme.
> 
> Any errors in ifconfig?  What kind of NICs do they have?

No errors (well, 1):
$ ifconfig eth0 | grep error
          RX packets:21420 errors:1 dropped:0 overruns:0 frame:0
          TX packets:15649 errors:0 dropped:0 overruns:0 carrier:0

$ ifconfig eth1 | grep error
          RX packets:1987 errors:1 dropped:0 overruns:0 frame:0
          TX packets:1261 errors:0 dropped:0 overruns:0 carrier:0

Cards are Tulip-based Tulip-based:

$ dmesg | grep eth
eth0: Lite-On 82c168 PNIC rev 32 at 0xa000, 00:C0:F0:3D:66:6C, IRQ 11.
eth1: Lite-On 82c168 PNIC rev 32 at 0x9800, 00:A0:CC:D9:7A:75, IRQ 10.

$ ethtool -i eth0
driver: tulip
version: 0.9.15-pre12
firmware-version: 
bus-info: 00:0d.0
$ ethtool -i eth1
driver: tulip
version: 0.9.15-pre12
firmware-version: 
bus-info: 00:0e.0

Kurt
-- 
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