Network throughput not reaching line rate. Need clarification on iflib.

[Bruce A. Mah]

If memory serves me right, Daniel Ebdrup Jensen wrote:
> Yes, iperf3 will default to single-threaded packet generation, et al. which
> favours fast cores with frequency boosting facilities.
> You might want to use iperf2 as that's properly multi-threaded, or you can
> use pkt-gen out of src/tools/tools/netmap/ or ports/net/pkt-gen.

While it's true that iperf3 is single-threaded, it should be capable of
saturating a 10GE link with a single TCP connection, given proper
command-line arguments (in particular, specifying a sufficiently large
socket-buffer size with the -w option).

But based on the symptom of packet loss, I'd say the single-threaded vs.
multi-threaded argument might not be relevant to the problem that the OP
has.

Bruce.

> On Fri, Feb 28, 2020 at 10:35 AM Hans Petter Selasky <hps at selasky.org>
> wrote:
> 
>> On 2020-02-28 10:03, Rajesh Kumar wrote:
>>> Hi FreeBSD team,
>>>
>>> I am writing a network driver using iflib framework and using "iperf3"
>> tool
>>> for performance testing.
>>>
>>
>> Is there any difference with "iperf" tool and using multiple threads? I
>> think iperf3 is single threaded ???
>>
>> --HPS
>>
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