From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jarek Poplawski Subject: Re: tbf/htb qdisc limitations Date: Fri, 15 Oct 2010 08:18:26 +0000 Message-ID: <20101015081826.GA7205@ff.dom.local> References: <20101012215932.GA1945@del.dom.local> <4CB4DE6E.7030802@hp.com> <20101013062649.GA6915@ff.dom.local> <20101013233653.1e363692.billfink@mindspring.com> <20101014064404.GA6219@ff.dom.local> <20101014031354.e172d737.billfink@mindspring.com> <20101014080939.GA7710@ff.dom.local> <20101014085005.GA8349@ff.dom.local> <20101015023749.f085006b.billfink@mindspring.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Rick Jones , Steven Brudenell , netdev@vger.kernel.org To: Bill Fink Return-path: Received: from mail-bw0-f46.google.com ([209.85.214.46]:58533 "EHLO mail-bw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751417Ab0JOITX (ORCPT ); Fri, 15 Oct 2010 04:19:23 -0400 Received: by bwz15 with SMTP id 15so782501bwz.19 for ; Fri, 15 Oct 2010 01:18:58 -0700 (PDT) Content-Disposition: inline In-Reply-To: <20101015023749.f085006b.billfink@mindspring.com> Sender: netdev-owner@vger.kernel.org List-ID: On Fri, Oct 15, 2010 at 02:37:49AM -0400, Bill Fink wrote: > On Thu, 14 Oct 2010, Jarek Poplawski wrote: > > > On Thu, Oct 14, 2010 at 08:09:39AM +0000, Jarek Poplawski wrote: > > > On Thu, Oct 14, 2010 at 03:13:54AM -0400, Bill Fink wrote: > > > > TSO/GSO was disabled and was using 9000-byte jumbo frames > > > > (and specified mtu 9000 to tc command). > > > > > > > > Here was one attempt I made using tbf: > > > > > > > > tc qdisc add dev eth2 root handle 1: prio > > > > tc qdisc add dev eth2 parent 1:1 handle 10: tbf rate 8900mbit buffer 1112500 limit 10000 mtu 9000 > > > > tc filter add dev eth2 protocol ip parent 1: prio 1 u32 match ip dst 192.168.1.23 flowid 10:1 > > > > > > > > I tried many variations of the above, all without success. > > > > > > The main problem are smaller packets. If you had (almost) only 9000b > > > frames this probably could work. [...] > > > > On the other hand, e.g. the limit above seems too low wrt mtu & rate. > > Actually, I discovered my commands above work just fine on > a 2.6.35 box: > > i7test7% nuttcp -T10 -i1 192.168.1.17 > 1045.3125 MB / 1.00 sec = 8768.3573 Mbps 0 retrans > 1045.6875 MB / 1.00 sec = 8772.0292 Mbps 0 retrans > 1049.5625 MB / 1.00 sec = 8804.2627 Mbps 0 retrans > 1043.1875 MB / 1.00 sec = 8750.9960 Mbps 0 retrans > 1048.6875 MB / 1.00 sec = 8796.3246 Mbps 0 retrans > 1033.4375 MB / 1.00 sec = 8669.3188 Mbps 0 retrans > 1040.7500 MB / 1.00 sec = 8730.7057 Mbps 0 retrans > 1047.0000 MB / 1.00 sec = 8783.2063 Mbps 0 retrans > 1040.0000 MB / 1.00 sec = 8724.0564 Mbps 0 retrans > 1037.4375 MB / 1.00 sec = 8702.5434 Mbps 0 retrans > > 10431.5608 MB / 10.00 sec = 8749.7542 Mbps 25 %TX 35 %RX 0 retrans 0.11 msRTT > > The problems I encountered were on a field system running > 2.6.30.10. I will investigate upgrading the field system > to 2.6.35. This change from 2.6.31 should matter here: http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.35.y.git;a=commit;h=a4a710c4a7490587406462bf1d54504b7783d7d7 Jarek P.