Date: Tue, 23 Sep 2014 18:40:15 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: "Alexander V. Chernikov" <melifaro@freebsd.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, Adrian Chadd <adrian@freebsd.org>, Elof Ofel <elofu17@hotmail.com> Subject: Re: How do I balance bandwidth over several virtual NICs? Message-ID: <CA%2BhQ2%2Bh8pnoUeh0big1JrYMrVkXYi=Txkh2Ua4i-=tCarq4rdQ@mail.gmail.com> In-Reply-To: <5421A1AF.9000800@FreeBSD.org> References: <DUB125-W13FDC584F5DF9881CF5FDEBCB30@phx.gbl> <CA%2BP_MZGA_uz_H_QsB%2BdgXEgbXNCjv7w-OToKby=ww%2BvKgnU4_Q@mail.gmail.com> <DUB125-W851F972702452D9809C8E5BCB30@phx.gbl> <CAJ-Vmo=NGGkOkPWQKZ=3gA3vYYyM2kcjd3m85ymdJY3q4ixxLw@mail.gmail.com> <5421310C.5010406@FreeBSD.org> <CAJ-VmomamPVwja2Tgfi46EBu8E5Hohr6FcshsOkDeycEvGV51Q@mail.gmail.com> <CA%2BhQ2%2BhU6XwaeyqdcseL9uusmKfyG4Ko7TwvsZwU=r1cUyCw1w@mail.gmail.com> <54218EF4.6090102@FreeBSD.org> <20140923154610.GD84074@onelab2.iet.unipi.it> <CAJ-VmokS=A3TFb4K_dyvXBYuFoa94cBMXezVJ7MkttPe9mK-1w@mail.gmail.com> <5421A1AF.9000800@FreeBSD.org>
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On Tuesday, September 23, 2014, Alexander V. Chernikov <melifaro@freebsd.org> wrote: > On 23.09.2014 20:00, Adrian Chadd wrote: > >> Ah, this behaviour. >> >> It's called DROP_EN on the intel igb / ixgbe hardware. Grep the >> drivers for that particular register bit/setting. >> >> Set that bit for an RX queue and it'll instruct the MAC to drop frames >> destined if that RX ring is full to it and keep receiving on the other >> rings. Otherwise yes, receiving on that ring with the ring full cuases >> the MAC to stop receiving on all rings until that ring has free space. >> >> You flip this on with ixgbe and igb by disabling tx/rx flowcontrol >> (sysctl dev.ix|igb.X.fc=0) before configuring the interface. >> > Oh, cool. > Yet another reason to turn flow control off by default. Or at least decouple the two features. Cheers Luigi > >> >> >> -a >> >> > -- -----------------------------------------+------------------------------- Prof. Luigi RIZZO, rizzo@iet.unipi.it . Dip. di Ing. dell'Informazione http://www.iet.unipi.it/~luigi/ . Universita` di Pisa TEL +39-050-2211611 . via Diotisalvi 2 Mobile +39-338-6809875 . 56122 PISA (Italy) -----------------------------------------+-------------------------------
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