Date: Fri, 22 Jan 2010 18:15:13 +0100 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Evgenii Davidov <dado@korolev-net.ru> Cc: freebsd-ipfw@freebsd.org Subject: Re: dummynet: waking up pipe Message-ID: <20100122171513.GA86641@onelab2.iet.unipi.it> In-Reply-To: <20100122164246.GE19815@korolev-net.ru> References: <yged42c4770.wl%ume@mahoroba.org> <25ff90d61001021736p7b695197q104f4a7769b51b71@mail.gmail.com> <yge8wc5u872.wl%ume@mahoroba.org> <20100110185232.GA27907@onelab2.iet.unipi.it> <20100112110539.GQ10388@korolev-net.ru> <20100122131026.GC19815@korolev-net.ru> <20100122133905.GA21059@onelab2.iet.unipi.it> <20100122133535.GD19815@korolev-net.ru> <20100122134628.GA22078@onelab2.iet.unipi.it> <20100122164246.GE19815@korolev-net.ru>
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On Fri, Jan 22, 2010 at 07:42:46PM +0300, Evgenii Davidov wrote: > ????????????, > > On Fri, Jan 22, 2010 at 02:46:28PM +0100, Luigi Rizzo ?????: > > > On Fri, Jan 22, 2010 at 04:35:35PM +0300, Evgenii Davidov wrote: > > ... > > > > > > my problem is that dummynet cpu usage jumps from 0 to 99%: > > > > > > > > > > > > 33 root 1 -68 - 0K 8K - 1 512.6H 86.18% dummynet > > > > > > 33 root 1 -68 - 0K 8K - 1 512.6H 85.89% dummynet > > > > > > 33 root 1 -68 - 0K 8K - 1 512.6H 88.28% dummynet > > > > > > 33 root 1 -68 - 0K 8K - 0 512.6H 78.17% dummynet > > > > > > 33 root 1 -68 - 0K 8K - 0 512.6H 0.88% dummynet > > > > > > 33 root 1 -68 - 0K 8K - 1 512.6H 0.10% dummynet > > > > > > 33 root 1 -68 - 0K 8K - 1 512.7H 0.00% dummynet > > > > > > 33 root 1 -68 - 0K 8K - 1 512.7H 0.10% dummynet > > > > > > > > i am not too clear on why this happens -- there shuold be only > > > > one instance of the dummynet thread, not 8 as in your case. > > > > > > no-no, one instance, it's a grep of a top log > > > > ok then it's rather normal -- the task wakes up every millisecond and > > it might have hundreds of packets to send at once, especially when > > the machine is heavily loaded as in your case. > > but since i restricted dummunet to run only on cpu 0 it's much better > maybe it's some smp problem in freebsd7 maybe the memory affinity helps a bit here. cheers luigi > -- > Evgenii V Davidov > _______________________________________________ > freebsd-ipfw@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-ipfw > To unsubscribe, send any mail to "freebsd-ipfw-unsubscribe@freebsd.org"
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