From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Furniss Date: Sun, 14 Aug 2005 18:13:34 +0000 Subject: Re: [LARTC] pfifo_fast as leaf qdisc for htb classes Message-Id: <42FF89CE.8020500@dsl.pipex.com> List-Id: References: <20050813115024.88441.qmail@web32608.mail.mud.yahoo.com> In-Reply-To: <20050813115024.88441.qmail@web32608.mail.mud.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org panca sorin wrote: > Thank you Andy! I did't find why I could't use the fw > match in ingress. Now it works. It will work on marks set in prerouting if you don't select packet action in your kernel config (near policer). > > Now I ran into another problem: > When I try to add a pfifo_fast leaf qdisc dor htb > classes it seg.-faults. Is pfifo_fast a special qdisc? > I can succesfully add other type of qdiscs. > > I found that a similar problem was reported in > february on a MIPS architecture. Yes I think it's special - but the default behavior of prio is much the same. > > root@zefir:/usr/src# tc qdisc add dev eth0 root handle > 1: htb default 10 > root@zefir:/usr/src# tc class add dev eth0 parent 1: > classid 1:1 htb rate 100Mbit ceil 100Mbit burst 50k > cburst 150k FWIW if you are shaping 100meg ethernet those settings would be too high I would use - ... rate 99mbit ceil 99mbit mpu 84 overhead 38 ... > I think htb and pfifo_fast assures a better QOS than > htb & sfq because I can priorize interactivity. > > Thank you in advance for any sugestions. Yes use prio if you are going to give one class for each user, you will still have to set the tos bits/classify yourself as you can't rely on apps/inbound having them set properly. Also remember that if you are shaping inbound traffic you need to back off from the link rates more than outbound so that a queue can build up. If the link is slow then you'll need to keep the queues short aswell, so you drop packets. Andy. _______________________________________________ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc