Hi Andreas, I hope I have this right, based on my limited understanding of Linux QoS. If I'm wrong then I hope someone will correct me =) > If I just attach a PRIO qdisc on eth1(outgoing) will I be able to > prioritise packets based on the TOS value. You don't even need to do that, the default qdisc is pfifo_fast which also prioritises by TOS flags. > The TOS value is set by a test application. It can also be overridded by a Netfilter rule, if you want to force or change priority for certain types of packets. > At very high data rates will the data stream with lower > priority TOS value be starved because it cannot send out of packets from > its band on eth1 interface?. Yes, if there is not enough capacity to send on eth1 then lower-priority packets will be starved, will queue up until the queue is full and then get dropped. > Does something be set in linux kernel so that kernel sets priority for > packets according to TOS value.I guess this priorty will be used by PRIO > qdisc(by default) to decide which band the packet belongs. Yes, it happens by default, with the pfifo_fast qdisc. Cheers, Chris. -- ___ __ _ / __// / ,__(_)_ | Chris Wilson -- UNIX Firewall Lead Developer | / (_ / ,\/ _/ /_ \ | NetServers.co.uk http://www.netservers.co.uk | \ _//_/_/_//_/___/ | 21 Signet Court, Cambridge, UK. 01223 576516 |
