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[perfsonar-user] Re: Iperf3 + bandwidth for TCP


Chronological Thread 
  • From: Brian Tierney <>
  • To: Arman Mohsin <>
  • Cc: "" <>, , "" <>, "" <>
  • Subject: [perfsonar-user] Re: Iperf3 + bandwidth for TCP
  • Date: Sun, 14 May 2017 12:18:50 -0700
  • Ironport-phdr: 9a23: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


-b works for both TCP and UDP, but --fq-rate works much better for TCP on CentOS7/Debian8 based hosts, as it does kernel-level pacing, not user-level pacing.



On Sat, May 13, 2017 at 7:54 PM, Arman Mohsin <> wrote:
Hi Brian,

Hope all is well. Does the iperf3 -c -b option limit bandwidth for TCP as well or is it ONLY for UDP? I tried to read the documentation in the man page but it is a bit confusing. In the earlier versions of iperf the -b option is used to test only UDP but I am not sure if it supports in the latest version (iperf3)


Regards,

Arman



--
Brian Tierney, http://www.es.net/tierney
Energy Sciences Network (ESnet), Berkeley National Lab
http://fasterdata.es.net




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