Date: Thu, 4 Aug 2016 17:24:17 +0200 From: Ben RUBSON <ben.rubson@gmail.com> To: freebsd-net@freebsd.org Subject: Re: Unstable local network throughput Message-ID: <06E414D5-9CDA-46D1-A26F-0B07E76FDB34@gmail.com> In-Reply-To: <5D6DF8EA-D9AA-4617-8561-2D7E22A738C3@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>
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> On 04 Aug 2016, at 11:40, Ben RUBSON <ben.rubson@gmail.com> wrote: >=20 >> On 02 Aug 2016, at 22:11, Ben RUBSON <ben.rubson@gmail.com> wrote: >>=20 >>> On 02 Aug 2016, at 21:35, Hans Petter Selasky <hps@selasky.org> = wrote: >>>=20 >>> 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 the card. A quick and dirty workaround is to "cpuset" = iperf and the interrupt and taskqueue threads to specific CPU cores. >>=20 >> My CPUs : 2x E5-2620v3 with DDR4@1866. >=20 > OK, so I cpuset all Mellanox interrupts to one NUMA, as well as the = iPerf processes, and I'm able to reach max bandwidth. > Choosing the wrong NUMA (or both, or one for interrupts, the other one = for iPerf, etc...) totally kills throughput. >=20 > However, full-duplex throughput is still limited, I can't manage to = reach 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) >=20 >>> Are you using "options RSS" and "options PCBGROUP" in your kernel = config? >=20 > I will then give RSS a try. Without RSS : A ---> B : 40Gbps (unidirectional) A <--> B : 45Gbps (bidirectional) With RSS : A ---> B : 28Gbps (unidirectional) A <--> B : 28Gbps (bidirectional) Sounds like RSS does not help :/ Why, without RSS, do I have difficulties to reach 2x40Gbps (full-duplex) = ? Thank U !=
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