> Date: Tue, 16 Sep 2008 22:43:25 +0800 > From: "Jian Qiu" <[EMAIL PROTECTED]> > Sender: [EMAIL PROTECTED] > > Interesting. > > I did a test on local UDP throughput. > > I was surprised to find out the performance with a SMP kernel was > worse than UP. (~74MB/s v.s. 96 MB/s).
Look at CPU affinity. I have seen significant jumps in performance when things switch between CPUs. It's best to lock the UDP cannon to a single CPU and that the CPU not be CPU0. (This applies to both BSD and Linux systems that I have worked with.) -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: [EMAIL PROTECTED] Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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