Re: [ippm] ippm Digest, Vol 235, Issue 45
rjmcmahon <rjmcmahon@rjmcmahon.com> Thu, 28 December 2023 20:21 UTC
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Subject: Re: [ippm] ippm Digest, Vol 235, Issue 45
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>> >> 4.1.1. Single-flow vs multi-flow >> >> ..... >> >> One of the configuration parameters for the test is an upper bound >> on >> the number of parallel load-generating connections. We recommend a >> default value for this parameter of 16. >> >> >> Question: What is the rationale for choosing 16 as the upper bound? > > > Thank you for the question! I will defer to Christoph and Stuart for > their answer re: the upper bound. I have heard them explain the > rationale in the past but cannot seem to recall the specifics! I don't > want to say something incorrect. > A bit of a tangent but for iperf 2 multi-thread testing the suggestion is one thread per core. Iperf 2 thread design is one thread per socket per direction so a full-duplex socket will have two traffic threads. A thread per core for 8 cores would be 4 full-duplex sockets or 8 one-way sockets. (The ack direction w/o data doesn't count towards this thread/code optimization.) Bob