Hi Christian, Thanks for the help. Please see my in-line comments: > -----Original Message----- > From: lartc-bounces@xxxxxxxxxxxxxxx [mailto:lartc-bounces@xxxxxxxxxxxxxxx] > On Behalf Of Christian Benvenuti > Sent: Thursday, June 14, 2007 4:44 PM > To: lartc@xxxxxxxxxxxxxxx > Subject: Re: PQ questions > > Hi, > > >Hi all, > > > >First, let me say I've been most impressed with how quickly and > >professionally people on this list ask and answer questions. > > > >Next, let me say that with which I need help is properly configuring > strict > >PQ, and gathering certain stats. Specifically: > > > >- I need to create a priority queue with four queues (let's say they are > of > >high, medium, normal, and low priority) > > > >- I need to use tc filters such that: > > > > - EF (0xB8) goes to the high priority queue > > > > - AF21 (0x50) goes to the medium priority queue > > > > - AF11 (0x28) goes to the normal priority queue, and > > > > - BE traffic goes to the low priority queue > > > >- For stat collection, I need to see: > > > > - how many bytes and packets are in each of the four queues > > > >- My configuration thus far is: > > > >tc qdisc add dev eml_test root handle 1: prio bands 4 priomap 0 1 2 3 > > > >tc filter add dev eml_test parent 1:0 prio 1 protocol ip u32 match ip tos > >0xb8 0xff flowid 1:1 > > > >tc filter add dev eml_test parent 1:0 prio 2 protocol ip u32 match ip tos > >0x80 0xff flowid 1:2 > > > >tc filter add dev eml_test parent 1:0 prio 3 protocol ip u32 match ip tos > >0x50 0xff flowid 1:3 > > > >tc filter add dev eml_test parent 1:0 prio 4 protocol ip u32 match ip tos > >0x00 0xff flowid 1:4 > >__________ > > Here is an article you may find useful: > http://citeseer.ist.psu.edu/539891.html > > Here is the description of the configuration parameters of the > PRIO qdisc: > http://www.lartc.org/howto/lartc.qdisc.classful.html#AEN903 > (just in case you did not know what the "priomap" option is > used for) > > >My questions are: > > > >- What if anything is missing/requiring change in my config given the > stated > >requirements? > > Your config does not prevent an higher priority class from starving > a lower priority class. Exactly. That is requirement. > You can prevent it in two different ways (at > least): Don't want to prevent it right now. > > 1) You can assign a TBF qdisc (Token Bucket) to the PRIO classes > TBF: http://www.lartc.org/howto/lartc.qdisc.classless.html#AEN691 > > 2) You can replace the PRIO qdisc with something like HTB/CBQ > CBQ: http://www.lartc.org/howto/lartc.qdisc.classful.html#AEN939 > HTB: http://luxik.cdi.cz/~devik/qos/htb/ > > >- What if any command should I use to view how many bytes and packets are > in > >each of the four queues? > > The PRIO qdisc does not return statistics for its classes. > However, a simple workaround consists of explicitly adding > a qdisc to the four classes. > By default the PRIO qdisc assigns a pFIFO (packet FIFO) qdisc to > its classes. > Here is how you can replace the 4 default pFIFO qdisc with 4 > explicit pFIFO qdisc: > > tc qdisc add dev eml_test parent 1:1 pfifo limit 1000 > tc qdisc add dev eml_test parent 1:2 pfifo limit 1000 > tc qdisc add dev eml_test parent 1:3 pfifo limit 1000 > tc qdisc add dev eml_test parent 1:4 pfifo limit 1000 > > Now you can get the stats with: > tc -s -d qdisc list dev eml_test Those stats are nice to have, but the ones I must have are for how many bytes/packets are enqueued at whatever time I check the queues. > > Regards > /Christian > [ http://benve.info ] > I have tried to configure PQ to have two queues per filter with no success. Is it even possible to have (what I'll call) hierarchical PQ? I have yet to find it. > > > > > _______________________________________________ > LARTC mailing list > LARTC@xxxxxxxxxxxxxxx > http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
