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Date: Wed, 29 Apr 2009 14:03:26 +0300 From: Radu Rendec <radu.rendec@...s.ro> To: Jesper Dangaard Brouer <hawk@...u.dk> Cc: Jarek Poplawski <jarkao2@...il.com>, Denys Fedoryschenko <denys@...p.net.lb>, netdev <netdev@...r.kernel.org> Subject: Re: htb parallelism on multi-core platforms On Wed, 2009-04-29 at 12:31 +0200, Jesper Dangaard Brouer wrote: > Just noticed that Jeremy Kerr has made some python scripts to make it even > easier to use oprofile. > See http://ozlabs.org/~jk/diary/tech/linux/hiprofile-v1.0.diary/ Thanks for the hint; I'll have a look at the scripts too. > I would rather want to see the output from cls_u32.ko > > opreport --symbols -cl cls_u32.ko --image-path=/lib/modules/`uname -r`/kernel/ samples % image name symbol name ------------------------------------------------------------------------------- 38424 100.000 cls_u32.ko u32_classify 38424 100.000 cls_u32.ko u32_classify [self] ------------------------------------------------------------------------------- Well, this doesn't tell us much more, but I think it's pretty obvious what cls_u32 is doing :) > > Am I misinterpreting the results, or does it look like the real problem > > is actually packet classification? > > Yes, it looks like the problem is your u32 classification setup... Perhaps > its not doing what you think its doing... didn't Jarek provide some hints > for you to follow? I've just realized that I might be hitting the worst-case bucket with the (ip) destinations I chose for the test traffic. I'll try I haven't tried tweaking htb_hysteresis yet (that was one of Jarek's hints) - it's debatable that it would help since the real problem seems to be in u32 (not htb), but I'll give it a try anyway. Another hint was to make sure that "tc class add" goes before corresponding "tc filter add" - checked: it's ok. Another interesting hint came from Calin Velea, whose tests suggest that the overall performance is better with napi turned off, since (rx) interrupt work is distributed to all cpus/cores. I'll try to replicate this as soon as I make some small changes to my test setup so that I'm able to measure overall htb throughput on the egress nic (bps and pps). Thanks, Radu Rendec -- 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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