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Re: [perfsonar-user] bwctl OSX giving strange results


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  • From: Brian Candler <>
  • To: "Bruce A. Mah" <>,
  • Cc: "" <>
  • Subject: Re: [perfsonar-user] bwctl OSX giving strange results
  • Date: Mon, 22 Dec 2014 11:02:04 +0000
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On 21/12/2014 12:14, Brian Candler wrote:
Nice theory, but I have found it's triggered by the -Z (--zerocopy) option on iperf3 with OSX. It can be replicated with standalone iperf3 without bwctl.
I have found the problem, patch at https://github.com/esnet/iperf/pull/231

In the process of doing this, I think I may have discovered why I was getting less-than-stellar performance using sendfile() on a back-to-back pair of 10G machines. The issue results in iperf spinning and using much more CPU than it ought to. Details here:
https://github.com/esnet/iperf/issues/232

Unfortunately I no longer have those two machines to test with :-(

Regards,

Brian Candler.


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