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Date: Fri, 24 Aug 2007 16:35:14 -0500 From: linas@...tin.ibm.com (Linas Vepstas) To: Jan-Bernd Themann <ossthema@...ibm.com> Cc: Bodo Eggert <7eggert@....de>, netdev <netdev@...r.kernel.org>, Thomas Klein <tklein@...ibm.com>, Jan-Bernd Themann <themann@...ibm.com>, linux-kernel <linux-kernel@...r.kernel.org>, linux-ppc <linuxppc-dev@...abs.org>, Christoph Raisch <raisch@...ibm.com>, Marcus Eder <meder@...ibm.com>, Stefan Roscher <stefan.roscher@...ibm.com> Subject: Re: RFC: issues concerning the next NAPI interface On Fri, Aug 24, 2007 at 11:11:56PM +0200, Jan-Bernd Themann wrote: > (when they are available for > POWER in our case). hrtimer worked fine on the powerpc cell arch last summer. I assume they work on p5 and p6 too, no ?? > I tried to implement something with "normal" timers, but the result > was everything but great. The timers seem to be far too slow. > I'm not sure if it helps to increase it from 1000HZ to 2500HZ > or more. Heh. Do the math. Even on 1gigabit cards, that's not enough: (1gigabit/sec) x (byte/8 bits) x (packet/1500bytes) x (sec/1000 jiffy) is 83 packets a jiffy (for big packets, even more for small packets, and more again for 10 gigabit cards). So polling once per jiffy is a latency disaster. --linas - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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