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. You can prevent it in two different ways (at least): 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 Regards /Christian [ http://benve.info ] _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
