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Date:      Fri, 28 Feb 2020 23:17:03 +0100
From:      Daniel Ebdrup Jensen <debdrup@freebsd.org>
To:        freebsd-drivers@freebsd.org, FreeBSD Hackers <freebsd-hackers@freebsd.org>
Subject:   Re: Network throughput not reaching line rate. Need clarification on iflib.
Message-ID:  <CAJEDNsg-dQA=7dwXfeSVTuch9oX0HT23JkLDangQUQtg=2A6ww@mail.gmail.com>
In-Reply-To: <f64e8fb8-0a72-ffc0-2301-a081399483b6@freebsd.org>
References:  <CAAO%2BANPvfRhLiCZX=0UWDToKWNACrZ66JgOd%2Bs_p9fAgc%2BrWTw@mail.gmail.com> <7cfc7c52-b548-19bd-343b-899aca45c654@selasky.org> <CAJEDNsi%2B-zC=LEv5y67X7pcKP83hLP=uSqcZRwdye_gWKRLjvQ@mail.gmail.com> <f64e8fb8-0a72-ffc0-2301-a081399483b6@freebsd.org>

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On Fri, Feb 28, 2020 at 7:39 PM Bruce A. Mah <bmah@kitchenlab.org> wrote:

> [Resending with a From: address that hopefully works better.]
>
> 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@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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> >>
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> >
>

Oh, I didn't mean to imply that that wasn't part of the issue - I'm sorry
if I made it sound like that.
I was just confirming what Hans was asking, and possibly using the excuse
to mention some things in base/ports that I think are also pretty neat. :)

Also no longer top-posting, which was rather ghastly of me. I apologise.



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