Date: Wed, 07 Oct 2009 13:46:27 +0500 From: rihad <rihad@mail.ru> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-net@freebsd.org, Eugene Grosbein <eugen@kuzbass.ru>, Luigi Rizzo <rizzo@iet.unipi.it>, Julian Elischer <julian@elischer.org> Subject: Re: dummynet dropping too many packets Message-ID: <4ACC5563.602@mail.ru> In-Reply-To: <alpine.BSF.2.00.0910061804340.50283@fledge.watson.org> 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>
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Robert Watson wrote: > > On Wed, 7 Oct 2009, Eugene Grosbein wrote: > >> On Tue, Oct 06, 2009 at 08:28:35PM +0500, rihad wrote: >> >>> I don't think net.inet.ip.intr_queue_maxlen is relevant to this >>> problem, as net.inet.ip.intr_queue_drops is normally zero or very >>> close to it at all times. >> >> When net.isr.direct is 1, this queue is used very seldom. Would you >> change it to 0, it will be used extensively. > > Just to clarify this more specifically: > > With net.isr.direct set to 0, the netisr will always be used when > processing inbound IP packets. > Maybe I've done something wrong, but setting net.isr.direct=0 on a live system hasn't yet overrun the default queue of 50 @460-470 mbit/s: $ sysctl net.inet.ip | fgrep intr net.inet.ip.intr_queue_maxlen: 50 net.inet.ip.intr_queue_drops: 0 $ sysctl net.isr.direct net.isr.direct: 0 I've yet to test how this direct=0 improves extensive dummynet drops.
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