From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Thibault Subject: large divisor for flow classifier Date: Fri, 15 Oct 2010 14:14:15 -0400 Message-ID: <4CB899F7.0@navigue.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Patrick McHardy Return-path: Received: from mail.navigue.com ([74.117.40.3]:53860 "EHLO mail.navigue.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756655Ab0JOSPj (ORCPT ); Fri, 15 Oct 2010 14:15:39 -0400 Sender: netdev-owner@vger.kernel.org List-ID: It appears that when setting a fairly large divisor on the flow classifier for sfq, traffic stops altogether. On my machine, anything above divisor 2200 seems to stop all traffic. If I want to be fair between hosts (but not flows) for a large network (say 6000 hosts), I run into problems. Obviously the rates here are quite low but this is just an example. I also tested on a real interface with the same results. Example that works: tc qdisc add dev ifb0 root handle 3: htb default 10 tc class add dev ifb0 parent 3: classid 3:1 htb rate 80kbit tc class add dev ifb0 parent 3:1 classid 3:10 htb rate 80kbit tc qdisc add dev ifb0 parent 3:10 handle 310: sfq perturb 10 tc filter add dev ifb0 parent 3: protocol all prio 1 u32 match mark 0x000 0xf00 flowid 3:10 tc filter add dev ifb0 parent 310: protocol all handle 0x310 flow hash keys dst divisor 1024 Example that doesn't work: tc qdisc add dev ifb0 root handle 3: htb default 10 tc class add dev ifb0 parent 3: classid 3:1 htb rate 80kbit tc class add dev ifb0 parent 3:1 classid 3:10 htb rate 80kbit tc qdisc add dev ifb0 parent 3:10 handle 310: sfq perturb 10 tc filter add dev ifb0 parent 3: protocol all prio 1 u32 match mark 0x000 0xf00 flowid 3:10 tc filter add dev ifb0 parent 310: protocol all handle 0x310 flow hash keys dst divisor 6144 Jonathan