Date: Tue, 23 Sep 2014 20:37:03 +0400 From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: Adrian Chadd <adrian@freebsd.org>, Luigi Rizzo <rizzo@iet.unipi.it> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, Elof Ofel <elofu17@hotmail.com> Subject: Re: How do I balance bandwidth over several virtual NICs? Message-ID: <5421A1AF.9000800@FreeBSD.org> In-Reply-To: <CAJ-VmokS=A3TFb4K_dyvXBYuFoa94cBMXezVJ7MkttPe9mK-1w@mail.gmail.com> 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>
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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. > > > > -a >
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