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Re: gigabit slower than fast-e


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  • From: Matthew J Zekauskas <>
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  • Subject: Re: gigabit slower than fast-e
  • Date: Thu, 06 Mar 2008 10:30:28 -0500

To follow up to myself...

* The Internet2 servers are all gigE, and all 9000-byte MTU capable.

* Another thing you could do is tune for the bottleneck instead of gigabit..

150 Mbps = 150*1000*1000 bits * 0.07 ms RTT = 10500000 bits
/8 = 1312500 bytes /(1024*1024) = 1.26 megabytes.

or

100 Mbps is 850K

and see if that improves things. It may be that something can't handle even that much back-to-back when they are sent at 1000Mbps.

There are also bwctl (<http://e2epi.internet2.edu/bwctl/>) servers at Internet2 router nodes, for a different way to split the problem (essentially run iperf to the core).

--Matt





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