Lousy Network Performance

[Net Llama!]

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
> 64 bytes from easter (192.168.0.2): icmp_seq=1 ttl=64 time=893 ms
> 64 bytes from easter (192.168.0.2): icmp_seq=2 ttl=64 time=53.6 ms
> 64 bytes from easter (192.168.0.2): icmp_seq=3 ttl=64 time=910 ms
> 64 bytes from easter (192.168.0.2): icmp_seq=4 ttl=64 time=72.6 ms
> 64 bytes from easter (192.168.0.2): icmp_seq=5 ttl=64 time=930 ms
> 64 bytes from easter (192.168.0.2): icmp_seq=6 ttl=64 time=0.699 ms
> 64 bytes from easter (192.168.0.2): icmp_seq=7 ttl=64 time=960 ms
> 64 bytes from easter (192.168.0.2): icmp_seq=8 ttl=64 time=3.69 ms
> 64 bytes from easter (192.168.0.2): icmp_seq=9 ttl=64 time=979 ms
> 64 bytes from easter (192.168.0.2): icmp_seq=10 ttl=64 time=0.694 ms
> 
> --- 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
> PING luther (192.168.0.1) 56(84) bytes of data.
> 64 bytes from luther (192.168.0.1): icmp_seq=0 ttl=64 time=0.418 ms
> 64 bytes from luther (192.168.0.1): icmp_seq=1 ttl=64 time=1038 ms
> 64 bytes from luther (192.168.0.1): icmp_seq=2 ttl=64 time=38.9 ms
> 64 bytes from luther (192.168.0.1): icmp_seq=3 ttl=64 time=1077 ms
> 64 bytes from luther (192.168.0.1): icmp_seq=4 ttl=64 time=77.2 ms
> 64 bytes from luther (192.168.0.1): icmp_seq=5 ttl=64 time=1116 ms
> 64 bytes from luther (192.168.0.1): icmp_seq=6 ttl=64 time=116 ms
> 64 bytes from luther (192.168.0.1): icmp_seq=7 ttl=64 time=1155 ms
> 64 bytes from luther (192.168.0.1): icmp_seq=8 ttl=64 time=155 ms
> 64 bytes from luther (192.168.0.1): icmp_seq=9 ttl=64 time=1194 ms
> 
> --- 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.
> 
> Kurt

Any errors in ifconfig?  What kind of NICs do they have?

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
L. Friedman                       	       netllama at linux-sxs.org
LlamaLand		 		http://netllama.linux-sxs.org

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