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

[Jeff W. Boote]

Michael Van Norman wrote:
>> boote at nms1-chin:~[465]$ uname -a
>> Linux nms1-chin.abilene.ucaid.edu 2.4.25-2.3.6smp #1 SMP Tue Mar 23 12:41:02
>> CST 
>> 2004 i686 i686 i386 GNU/Linux
>>
>> Not so current... ;)
> 
> And that may be why it works! :)
> 
> I don't think we had these problems when we were running a 2.4 kernel and
> alpha web100 code.  Have you guys tried using the current web100 kernel
> releases?  Put another way: is there a reason the test nodes are still
> running code that's over two years old?

Laziness? If it ain't broke...

Actually, we are in the process of testing:

boote at nms-blmt-rtrh2:~[11]$ uname -a
Linux nms-blmt-rtrh2 2.6.9-42.0.2.ELsmp #1 SMP Thu Aug 17 18:00:32 EDT 2006 i686 
i686 i386 GNU/Linux

This is what we are most likely going to deploy on the new network for our 
measurement hosts. It has worked fine in the lab, but we have not been able to 
test any high BW*Delay paths yet. I will be setting one up in Tampa next week 
for SC. I hope to test from Tampa to current abilene POPs as well as to other 
new test systems at IU.

jeff