Date: Mon, 15 Aug 2016 18:45:07 -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-VmonTQApYBZ6Zc8Hr3ZvrSKmvg2ix=rvWwwBH3JyVSUQifg@mail.gmail.com> In-Reply-To: <91AEB1BD-44EA-43AD-A9A1-6DEBF367DF9B@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> <CAJ-VmomW0Wth-uQU-OPTfRAsXW1kTDy-VyO2w-pgNosb-N1o=Q@mail.gmail.com> <B4D77A84-8F02-43E7-AD65-5B92423FC344@gmail.com> <CAJ-Vmo=Mfcvd41gtrt8GJfEtP-DQFfXt7pZ8eRLQzu73M=sX4A@mail.gmail.com> <7DD30CE7-32E6-4D26-91D4-C1D4F2319655@gmail.com> <CAJ-VmongwvbY3QqKBV%2BFJCHOfSdr-=v9CmLH1z=Tqwz19AtUpg@mail.gmail.com> <AF923C63-2414-4DCE-9FD9-CAE02E3AC8CE@gmail.com> <CAJ-VmonL8kVs3=BBg02cbzXA9NpAh-trdCBh4qkjw29dOCau-g@mail.gmail.com> <91AEB1BD-44EA-43AD-A9A1-6DEBF367DF9B@gmail.com>
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Hi, ok, can you try 5) but also running with the interrupt threads pinned to CPU 1? It looks like the interrupt threads are running on CPU 0, and my /guess/ (looking at the CPU usage distributions) that sometimes the userland bits run on the same CPU or numa domain as the interrupt bits, and it likely decreases some latency -> increasing throughput slightly. Thanks, -adrian
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