Date: Tue, 23 Sep 2014 17:46:10 +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: <20140923154610.GD84074@onelab2.iet.unipi.it> In-Reply-To: <54218EF4.6090102@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>
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On Tue, Sep 23, 2014 at 07:17:08PM +0400, Alexander V. Chernikov wrote: > On 23.09.2014 18:44, Luigi Rizzo wrote: ... > However, in addition to non-symmetric RSS (which is hopefully being > addressed), there is another > usual "producer - multuple consumers" problem: one snort process can > start process packets very slowly, or hang, or crash. > In that case host RX ring is getting full, NIC fails to push packets to > given queue and start storing them inside > its skid buffer (512k for Niantic afair). After that buffer becomes full > traffic and all processing stops. interesting. Actually, scary! Do you have any reference to the data sheets documenting that behaviour ? I have indeed received reports saying something similar but always suspected user errors. The fact that a starved queue can consume the entire internal buffer seems a really bad bug. At least you can overcome this one by having the demux done in software. cheers luigi
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