Date: Thu, 08 Oct 2009 20:32:46 +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: <4ACE061E.4010807@mail.ru> In-Reply-To: <alpine.BSF.2.00.0910071420290.38033@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> <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>
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Robert Watson wrote: > I would suggest making just the HZ -> 4000 change for now and see how > it goes. > ~4000 online users, ~450-470 mbps traffic, 300-600 global drops per second. Same ole. Not funny at all. net.inet.ip.dummynet.io_pkt_drop: 0 net.inet.ip.intr_queue_drops: 0 net.inet.ip.fastforwarding: 1 > Robert Watson wrote: > Suggestions like increasing timer resolution are intended to spread > out the injection of packets by dummynet to attempt to reduce the > peaks of burstiness that occur when multiple queues inject packets in > a burst that exceeds the queue depth supported by combined hardware > descriptor rings and software transmit queue. My last chance is to tweak the software transmit queue. Just how can I alter its size? P.S.: We're definitely going to buy a 10GigE card. Like this one: http://cgi.ebay.com/EXPX9502CX4-10-CX4-DualPort-Svr-Adap-Intel-Corp_W0QQitemZ150358746205QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item230214645d
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