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Subject: Re: GRE/gif/netgraph tunnel speed on 10Gbit channel
To: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net>,
 Vitalij Satanivskij <satan@ukr.net>
Cc: freebsd-net@freebsd.org
References: <201805291402.w4TE2RMe065517@pdx.rh.CN85.dnsmgr.net>
From: "Muenz, Michael" <m.muenz@spam-fetish.org>
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Date: Tue, 29 May 2018 19:42:42 +0200
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Am 29.05.2018 um 16:02 schrieb Rodney W. Grimes:
>> Am 29.05.2018 um 13:33 schrieb Vitalij Satanivskij:
>>
>> MM> Can you try MTU 1400 on GRE0 and MSS of 1300 just for testing?
>> MM> With this values I get 4600Mbit sending and 1400Mbit receiving with
>> MM> iperf and 10 parallel streams.
>> MM>
>>
>> UUUPSS looks like i have problem with metodology
>>
>> I'm use iperf3 and even with -P10 or run's in parallel (on diferents ports) it show summary of +-2gbits max
> Iperf3 is known not to do Parallel well:
> -P, --parallel n
>                number of parallel client streams to run. Note that iperf3 is
>                single threaded, so if you are CPU bound, this will not yield
>                higher throughput.
>
> I suggest using iperf for -P tests that cause the single thread of
> iperf3 to become CPU bound.

Oh, this was new to me. With iperf I got consistent 4,6Gbit in both 
directions.