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Date: Thu, 10 Jan 2008 11:01:30 -0800 From: "Kok, Auke" <auke-jan.h.kok@...el.com> To: Rick Jones <rick.jones2@...com> CC: Chris Friesen <cfriesen@...tel.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: questions on NAPI processing latency and dropped network packets Rick Jones wrote: >> 1) Interrupts are being processed on both cpus: >> >> root@...e0-0-0-13-0-11-1:/root> cat /proc/interrupts >> CPU0 CPU1 >> 30: 1703756 4530785 U3-MPIC Level eth0 > > IIRC none of the e1000 driven cards are multi-queue the pci-express variants are, but the functionality is almost always disabled (and relatively new anyway). even with multiqueue, you can still have only a single irq line (which defeats the purpose of course mostly). >, so while the above > shows that interrupts from eth0 have been processed on both CPUs at > various points in the past, it doesn't necessarily mean that they are > being processed on both CPUs at the same time right? never will, an irq can only be processed on one cpu at a time anyway, obviously the irq here has been migrated ONCE from one of the cpu's to the other. unfortunately you can't see from /proc/interrupts whether this happens frequently or not, or how many times it happened before. Auke -- 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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