Date: Wed, 10 Oct 2007 20:11:39 +0400 From: Vladimir Ivanov <wawa@yandex-team.ru> To: Ed Maste <emaste@phaedrus.sandvine.ca> Cc: freebsd-net@freebsd.org, Cristian KLEIN <cristi@net.utcluj.ro>, lists@codeangels.com Subject: Re: FreeBSD as a gigabit router Message-ID: <470CF9BB.5090704@yandex-team.ru> In-Reply-To: <20071010145453.GA54106@sandvine.com> References: <4703F9C3.2060601@net.utcluj.ro> <4532.192.168.2.137.1191451931.squirrel@www.codeangels.com> <470535D6.7020601@net.utcluj.ro> <0D18E826-52EA-4BEC-9404-1C98BFCDD418@staff.openaccess.org> <20071010145453.GA54106@sandvine.com>
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[-- Attachment #1 --] Ed Maste wrote: > On Thu, Oct 04, 2007 at 12:02:56PM -0700, Michael DeMan wrote: > > >> Also, we've noticed at least on FBSD 6.x that there seem to be very >> few advantages in using polling on network interfaces. We still run >> it, so that we have responsive SSH/BGP/OSPF processes on the >> machines, but my testing has shown that for sheer throughput, there >> is basically no difference. I'd be curious if anybody knows the >> scoop on this. >> The polling mechanism includes a feedback mechanism that attempts to >> keep a certain amount of CPU time available for userland. It works >> well at keeping the system usable under high load, but it doesn't >> perform so well if you want to dedicate most of the CPU time to polling >> in order to get near the maximum throughput. >> >> JFYI: We've used another trick. Yandex's driver allows to alter RX' threads priority. Also, it disables interrupts if driver busy (and works like a polling). This combination seems to be very stable under heavy load. Also, I seem it more intuitive for tuning. > I have some prototype code that addresses this, and the the throughput > with the new polling algorithm beat the non-polling kernel perf. by a > small margin. This won't make it into RELENG_7, but I plan to bring > it to HEAD at some point. > > -Ed > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > WBR, -- Vladimir Ivanov Network Operations Center OOO "Yandex" t: +7 495 739-7000 f: +7 495 739-7070 @: noc@yandex.net (corporate) wawa@yandex-team.ru (personal) www: www.yandex.ru -- [-- Attachment #2 --] 0 *H 01 0 + 0 *H '00I rJN0 *H 0b1 0 UZA1%0#U Thawte Consulting (Pty) Ltd.1,0*U#Thawte Personal Freemail Issuing CA0 070704151345Z 080703151345Z0E1 0 UThawte Freemail Member1"0 *H wawa@yandex-team.ru0"0 *H 0 ۨZ~M[d #{Ȳe P|z?)!S}hamN0lؾߏJ{B 6%rM4lq C%Qdi4uòI ߥ2 'Bj{ ]λh~/DhG pXCBRIܕ}φA ԝ =TΪ\7oƏ7f /wo?pXB{MC˥|m& ug< YY 00.0 U 0wawa@yandex-team.ru0 U 0 0 *H Vbo p兵1U{ph5PϹ(;fr `&Blo .Vْ 3z>䜺:'1 <ۥ usx K\(oe 0,43tU#-$0?0 0 *H 01 0 UZA10U Western Cape10U Cape Town10U Thawte Consulting1(0&U Certification Services Division1$0"UThawte Personal Freemail CA1+0) *H personal-freemail@thawte.com0 030717000000Z 130716235959Z0b1 0 UZA1%0#U Thawte Consulting (Pty) Ltd.1,0*U#Thawte Personal Freemail Issuing CA00 *H 0 Ħ<UsUNʙZ hup [v :aQP 0cZ,p+Z?qV˯< 6$*+w=+>@dקe*TH<a@ dr` 00U 0 0CU <0:08642http://crl.thawte.com/ThawtePersonalFreemailCA.crl0 U 0)U "0 0 10UPrivateLabel2-1380 *H HP . fgCL!6 -6/ P p<ab:~ t%Pb'qW%ݩ9 Oe_N4[5MwV!x!5$ F]_eO1Q0M0v0b1 0 UZA1%0#U Thawte Consulting (Pty) Ltd.1,0*U#Thawte Personal Freemail Issuing CA rJN0 + 0 *H 1 *H 0 *H 1 071010161139Z0# *H 1"5ARu1B$-0R *H 1E0C0 *H 0*H 0 *H @0+0 *H (0 *H ƹZ O/VFA ?_Ar ܻlsPx e՚$T@RE4ʽʠEkT{P|E:[9`vjW@$,(=/X^İ1Ggfk:ey"d-I>z{5P?9cjG*2[ e <}ZD'ܹy`gdǘфZncj.{dsj
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