also see: https://fasterdata.es.net/host-tuning/packet-pacing/
On Mon, May 15, 2017 at 7:02 AM, Uhl, George D. (GSFC-423.0)[SGT INC] <
george.d....@nasa.gov> wrote:
> Hi Arman,
>
> Make sure the FQ is enabled in the kernel:
>
> http://man7.org/linux/man-pages/man8/tc-fq.8.html
>
> George
>
> From: <perfsonar-user-requ...@internet2.edu> on behalf of Arman Mohsin <
> arman.mohsi...@gmail.com>
> Date: Sunday, May 14, 2017 at 4:46 PM
> To: Brian Tierney <bltier...@es.net>
> Cc: "iperf-...@googlegroups.com" <iperf-...@googlegroups.com>, "
> iperf-users@lists.sourceforge.net" <iperf-users@lists.sourceforge.net>, "
> perfsonar-u...@internet2.edu" <perfsonar-u...@internet2.edu>, "
> perfsonar-develo...@internet2.edu" <perfsonar-develo...@internet2.edu>
> Subject: [perfsonar-user] Re: Iperf3 + bandwidth for TCP
>
> But --fq-rate is not limiting my bandwidth for example to 300mbit as you
> can see in the following example.
>
> iperf3 -c $SERVER_ADDRESS --fq-rate 300M -p $PORT -t $TIME -i $INTERVAL
> -C, --linux-congestion cubic -Z
>
> The output at the server end is
>
> [ ID] Interval Transfer Bandwidth
> [ 5] 0.00-1.00 sec 110 MBytes 919 Mbits/sec
> [ 5] 1.00-2.00 sec 116 MBytes 976 Mbits/sec
> [ 5] 2.00-3.00 sec 122 MBytes 1.03 Gbits/sec
> [ 5] 3.00-4.00 sec 117 MBytes 985 Mbits/sec
> [ 5] 4.00-5.00 sec 127 MBytes 1.06 Gbits/sec
> [ 5] 5.00-5.04 sec 5.23 MBytes 1.00 Gbits/sec
> - - - - - - - - - - - - - - - - - - - - - - - - -
> Test Complete. Summary Results:
> [ ID] Interval Transfer Bandwidth
> [ 5] 0.00-5.04 sec 0.00 Bytes 0.00 bits/sec sender
> [ 5] 0.00-5.04 sec 597 MBytes 994 Mbits/sec
> receiver
> CPU Utilization: local/receiver 1.3% (0.1%u/1.2%s), remote/sender 0.0%
> (0.0%u/0.0%s
>
> On Sun, May 14, 2017 at 9:18 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
>>
>>
>
--
Brian Tierney, http://www.es.net/tierney
Energy Sciences Network (ESnet), Berkeley National Lab
http://fasterdata.es.net
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