Date: Tue, 9 Sep 2008 15:33:30 +0200 From: "Jacques Fourie" <jacques.fourie@gmail.com> To: freebsd-arm@freebsd.org Subject: Routing benchmarks Message-ID: <be2f52430809090633o7b80f23y2749a055f61d5cb0@mail.gmail.com>
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Hi, I've performed some benchmark tests on my Gumstix Connex 400 (Intel Xscale PXA 255 CPU clocked at 400MHz) with a netDuo expansion board. This board has two smc network interfaces. I configure the gumstix as a router and measure network throughput with netperf running on seperate boxes on either side of the gumstix. My initial tests showed a TCP throughput of 2Mbit/s. After adapting the smc driver to use DMA this figure went up to 7Mbit/s. Although this is a significant improvement, it still seems to be a bit slow. Does anyone have any tips on how I can go about to try and figure out where the bottleneck lies? Initial profiling showed that a significant amount of time was spent doing memory to memory copies of data, but after the DMA change profiling does not show any obvious culprits. Jacqueshome | help
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