OpenBSD 4.9 Latency and Throughput testing

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Contributed by pitrh on Fri Oct 14 04:53:13 2011 (GMT)
from the filling-the-tubes dept.Andrew Fresh wrote in to tell us about his recent work in measuring key performance data for OpenBSD 4.9 using professional-grade testing equipment. Andrew writes,

I have been working to build a new router for a customer and have had access to a pair of Spirent SmartBits SMB-600 with gigabit interfaces. This gave me the opportunity to do some testing. The machines available are Dell PowerEdge 860’s with “80557,Xeon 3000 Conroe,3060,LGA775,Burn 2″ processors. I tested with the onboard bge interfaces and thanks to Dave some em NICs as well.

The testing shows that with a single processor kernel for any average packet size above 767 bytes you can easily saturate a gigabit network interface forwarding packets. I was able to achieve close to 300k pps in any configuration I tested. Surprisingly with small packet sizes, amd64 did slightly better than i386 achieving a maximum of of 347,812 pps with an em NIC. Until the interface was saturated, latency remained low at less than 500 microseconds.

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