Date: Thu, 8 Oct 2009 22:19:48 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: rihad <rihad@mail.ru> Cc: freebsd-net@freebsd.org, Eugene Grosbein <eugen@kuzbass.ru>, Robert Watson <rwatson@freebsd.org>, Luigi Rizzo <rizzo@iet.unipi.it>, Julian Elischer <julian@elischer.org> Subject: Re: dummynet dropping too many packets Message-ID: <20091008212623.D88524@sola.nimnet.asn.au> In-Reply-To: <4ACCA92A.9070803@mail.ru> References: <4AC9E29B.6080908@mail.ru> <20091005123230.GA64167@onelab2.iet.unipi.it> <4AC9EFDF.4080302@mail.ru> <4ACA2CC6.70201@elischer.org> <4ACAFF2A.1000206@mail.ru> <4ACB0C22.4000008@mail.ru> <20091006100726.GA26426@svzserv.kemerovo.su> <4ACB42D2.2070909@mail.ru> <20091006142152.GA42350@svzserv.kemerovo.su> <4ACB6223.1000709@mail.ru> <20091006161240.GA49940@svzserv.kemerovo.su> <alpine.BSF.2.00.0910061804340.50283@fledge.watson.org> <4ACC5563.602@mail.ru> <4ACC56A6.1030808@mail.ru> <alpine.BSF.2.00.0910070957430.58146@fledge.watson.org> <4ACC5DEC.1010006@mail.ru> <alpine.BSF.2.00.0910071036280.58146@fledge.watson.org> <4ACC65A0.7030900@mail.ru> <alpine.BSF.2.00.0910071312420.58146@fledge.watson.org> <4ACC8CC8.8050403@mail.ru> <alpine.BSF.2.00.0910071420290.38033@fledge.watson.org> <4ACCA92A.9070803@mail.ru>
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On Wed, 7 Oct 2009, rihad wrote: > Robert Watson wrote: > > > I would suggest making just the HZ -> 4000 change for now and see how it > > goes. > > > OK, I will try testing HZ=4000 tomorrow morning, although I'm pretty sure > there still will be some drops. Even if there are, I'd like to know what (rough) percentage in increased interrupt load you experience with HZ=4000 vs 1000 on that beast in your application, or of any discernable effects on other running processes? [Thanks guys for this interesting thread] > > > Can someone please say how to increase the "ifnet transmit queue sizes"? > > > > Unfortunately, I fear that this is driver-specific, and in the case of bce > > requires a recompile. In the driver init code in if_bce, the following > > code appears: > > > > ifp->if_snd.ifq_drv_maxlen = USABLE_TX_BD; > > IFQ_SET_MAXLEN(&ifp->if_snd, ifp->if_snd.ifq_drv_maxlen); > > IFQ_SET_READY(&ifp->if_snd); > > > > Which evaluates to a architecture-specific value due to varying pagesize. > > You might just try forcing it to 1024. > > > I think I'll try this too, if HZ=4000 doesn't help, thanks a lot. > In the long run we'll switch to some high-quality 10 GiGE cards.
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