[net-perf] bad performance w/o jumbo frames over large BDPs

[Michael Van Norman]

I am seeing the same behavior.  Mike and I suspected txqueuelen, but 
some testing this evening doesn't seem to point that direction (I get 
the same problem set to 100 and 1000).

Can you dump the sysctl and ifconfig information on the Abilene test 
nodes?  Maybe we can spot something at variance with our configs?

/Mike

Jeff W. Boote wrote:
> Michael Sinatra wrote:
>> I am going to try configuring the kernel for the advanced TCP congestion
>> stuff that Linux has built in and see how that goes.  I will also set up
>> to capture a packet trace, so that I can better figure out what is 
>> going on.
>>
>> I am hoping that Jeff Boote and/or Eric Boyd might be able to shed some
>> light on how the Abilene nodes are configured so as to get the
>> performance they do.
> 
> I'm not sure what is going on. The configuration looks reasonable.
> 
> Along with the packet trace, I would recommend adding the -x flag so you 
> can see the sender side information along with the receiver side.
> 
> jeff
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