I sent this the other day, but I must have misaddressed it since this is my first posting to this list. Sorry for the newbie questions. Bibb Cain > -----Original Message----- > From: Cain, Joseph > Sent: Thursday, May 29, 2003 5:18 PM > To: 'lartc@xxxxxxxxxxxxxxx' > Cc: Cain, Joseph > Subject: pfifo_fast and prio > > A couple of quick questions about using priority queuing. I am > doing experiments with ad hoc routing protocols and I want > to ultimately have 3 or 4 classes of traffic. At present I am > using the default pfifo_fast queuing discipline on the wireless > interface with 3 classes of traffic and with a 100 packet > buffer on the interface. > 1) Is there a way to allocate a fixed amount of buffer space > to each of the 3 bands with pfifo_fast? I suspect not, but I > don't see any documentation on this. My guess is that it is > one big block of memory that could be filled by lower > priority packets and reject new higher priority packets when full. > I think we have encountered congested situations where > higher priority traffic may be blocked because the buffer > is full of lower priority packets. Will this be true? > 2) I want to eventually replace this pfifo_fast queuing discipline > with the prio queuing discipline with 4 bands and with defined > amounts of buffer space allocated to each band when I understand how to do > it. The examples I have seen in the HOWTO for configuring this seem to > indicate > that the prio queuing discipline automatically comes up with 3 bands, but I > didn't see > any examples of tc commands to configure additional bands > or allocate buffer to the bands. Is this possible and is there > a tc document that provides the necessary commands? > Or could you show me the necessary commands? > > Thanks for the help. > > Bibb Cain
