Date: Wed, 10 Aug 2016 12:47:21 -0700 From: Adrian Chadd <adrian.chadd@gmail.com> To: Ben RUBSON <ben.rubson@gmail.com> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: Unstable local network throughput Message-ID: <CAJ-VmomW0Wth-uQU-OPTfRAsXW1kTDy-VyO2w-pgNosb-N1o=Q@mail.gmail.com> In-Reply-To: <BD0B68D1-CDCD-4E09-AF22-34318B6CEAA7@gmail.com> References: <3C0D892F-2BE8-4650-B9FC-93C8EE0443E1@gmail.com> <bed13ae3-0b8f-b1af-7418-7bf1b9fc74bc@selasky.org> <3B164B7B-CBFB-4518-B57D-A96EABB71647@gmail.com> <5D6DF8EA-D9AA-4617-8561-2D7E22A738C3@gmail.com> <BD0B68D1-CDCD-4E09-AF22-34318B6CEAA7@gmail.com>
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hi, yeah, I'd like you to do some further testing with NUMA. Are you able to run freebsd-11 or -HEAD on these boxes? -adrian On 8 August 2016 at 07:01, Ben RUBSON <ben.rubson@gmail.com> wrote: > >> On 04 Aug 2016, at 11:40, Ben RUBSON <ben.rubson@gmail.com> wrote: >> >> >>> On 02 Aug 2016, at 22:11, Ben RUBSON <ben.rubson@gmail.com> wrote: >>> >>>> On 02 Aug 2016, at 21:35, Hans Petter Selasky <hps@selasky.org> wrote: >>>> >>>> The CX-3 driver doesn't bind the worker threads to specific CPU cores = by default, so if your CPU has more than one so-called numa, you'll end up = that the bottle-neck is the high-speed link between the CPU cores and not t= he card. A quick and dirty workaround is to "cpuset" iperf and the interrup= t and taskqueue threads to specific CPU cores. >>> >>> My CPUs : 2x E5-2620v3 with DDR4@1866. >> >> OK, so I cpuset all Mellanox interrupts to one NUMA, as well as the iPer= f processes, and I'm able to reach max bandwidth. >> Choosing the wrong NUMA (or both, or one for interrupts, the other one f= or iPerf, etc...) totally kills throughput. >> >> However, full-duplex throughput is still limited, I can't manage to reac= h 2x40Gb/s, throttle is at about 45Gb/s. >> I tried many different cpuset layouts, but I never went above 45Gb/s. >> (Linux allowed me to reach 2x40Gb/s so hardware is not a bottleneck) > > OK, I then found a workaround. > > In the motherboards' BIOS, I disabled the following option : > Advanced / ACPI Settings / NUMA > > And I'm now able to go up to 2x40Gb/s ! > I'm then even able to achieve this throughput without any cpuset ! > > Strange that Linux was able to deal with this setting, but I'm pretty sur= e production performance will be easier to maintain with only 1 NUMA. > > Feel free to ask me if you want further testing with 2 NUMA. > > Ben > > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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