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Date: Wed, 23 Sep 2009 11:56:04 -0700 From: Ben Greear <greearb@...delatech.com> To: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com> CC: NetDev <netdev@...r.kernel.org> Subject: Re: Getting physical packet counts with LRO enabled with ixgbe? On 09/23/2009 11:50 AM, Peter P Waskiewicz Jr wrote: >> That's a bummer. I'm guessing you might get close to right on average with some >> trivial math, but if someone is sending you pkts with size of 1000 and >> your MTU is 1500, would there be any way to tell that the pkts were originally >> 1000 bytes instead of 1500? > > Good point. > >> Next time you guys re-compile your hardware, please consider adding byte counters :) > > On 10G adapters, byte counters can skyrocket quickly, so we'd need to > read them often to avoid them wrapping. But I will forward your request > to our HW design folks and see if they have other ideas to implement > these counters and make them efficient. It still takes a while to wrap 64-bit counters :) But, you do have to read every 3 secs or so if you're using 32-bit counters. This can be dealt with in user-space easily enough as long as polling the NIC for counters is efficient. Thanks, Ben -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com -- 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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