em0 performance subpar

[Mike Tancsa]

On 4/28/2011 11:01 AM, Adam Stylinski wrote:
> 
> ./netblast 192.168.0.121 5001 32768 30
> 
> start:             1304002549.184689025
> finish:            1304002579.187555311
> send calls:        2163162
> send errors:       2095950
> approx send rate:  2240
> approx error rate: 0
> 
> ? This output is a bit cryptic but from what I think I understand from the source code it's the number of successful sends of the payload size in 30 seconds.  
> 
> So to do the math: 
> (32768*2210)/(1024*1024)
> 69.06250000000000000000MB/sec?  This is still only saturating about half the link speed.

Just to be clear, you have something listening on the other side on port
5001 right ?  ie on 192.168.0.121, you did a ./netreceive 5001... And
the payload is.... 32768 ?!? Try something that does not need
fragmentation and is within your max MTU.  e.g. 500 byte frames should
saturate a gigabit link.

Watch it in real time with something like ifstat

./netblast 192.168.0.121 5001 500 5

	---Mike




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Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike at sentex.net
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