Also, for TCP, later version of iperf 2 supports -b on the client
(transmitter) using a very simple token bucket
<https://en.wikipedia.org/wiki/Token_bucket>. The token bucket depth is
"unlimited" though.
I'm considering two things,
1) Limiting the token bucket depth based on four times the -i interval, if
none then no limit
2) Adding token bucket support for the server (read)
For kernel level traffic shaping w/linux, linux traffic control
<https://en.wikipedia.org/wiki/Tc_(Linux)> can be used.
I think all the techniques have advantages and disadvantages depending upon
the goals of the testing.
Bob
On Sun, May 14, 2017 at 3:18 PM, Brian Tierney <bltier...@es.net> wrote:
>
> -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 <arman.mohsi...@gmail.com>
> 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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