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Date: Thu, 20 Aug 2009 16:17:39 +0300 From: Aviv Greenberg <avivgnet@...il.com> To: Bill Fink <billfink@...dspring.com> Cc: Andrew Gallatin <gallatin@...i.com>, netdev@...r.kernel.org Subject: Re: Receive side performance issue with multi-10-GigE and NUMA On Thu, Aug 20, 2009 at 10:26, Bill Fink<billfink@...dspring.com> wrote: > IIRC, under DevCap they indicated MaxPayload 4096 bytes, and under > DevCtl they indicated MaxPayload 128 bytes and MaxReadReq 4096 bytes, > and was the same on both the Asus and SuperMicro systems. I will > doublecheck tomorrow at work. I am not clear on the meanings of > the different parameters. And is DevCtl for PCI control messages > and DevCap for actual data transfers or something else? IIRC DevCap is what the device is capable of, and DevCtl is a control register that is used to limit the device's PCIe MTU if needed (e.g chipset limit). MaxPayload is the one used for RX DMA writes, and 128 bytes might be too low. I suggest you double check that. You have to first figure out if your performance is limited by PCIe bandwidth, or due to the NUMA stuff. -- Stephen Leacock - "I detest life-insurance agents: they always argue that I shall some day die, which is not so." - http://www.brainyquote.com/quotes/authors/s/stephen_leacock.html -- 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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