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Message-ID: <4652920C.8020608@cosmosbay.com> Date: Tue, 22 May 2007 08:47:40 +0200 From: Eric Dumazet <dada1@...mosbay.com> To: Eric Dumazet <dada1@...mosbay.com> CC: John Miller <forall@...l15.com>, netdev@...r.kernel.org Subject: Re: UDP packet loss when running lsof Eric Dumazet a écrit : > John Miller a écrit : >> Hi Eric, >> >>> I CCed netdev since this stuff is about network and not >>> lkml. >> >> Ok, dropped the CC... >> >>> What kind of machine do you have ? SMP or not ? >> >> It's a HP system with two dual core CPUs at 3GHz, the >> storage system is connected through QLogic FC-HBA. It should >> really be fast enough to handle a data stream of 50 MB/s... > > Then you might try to bind network IRQ to one CPU > (echo 1 >/proc/irq/XX/smp_affinity) > > XX being your NIC interrupt (cat /proc/interrupts to catch it) > > and bind your user program to another cpu(s) > > You might hit a cond_resched_softirq() bug that Ingo and others are > sorting out right now. Using separate CPU for softirq handling and your > programs should help a lot here. You might try this patch, now that Ingo "Signed-off-by" it. http://marc.info/?l=linux-kernel&m=117981607429875&w=2 I guess that with a correct softirq resched, no need to play with IRQ affinities, unless you really want to push performance. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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