prioritizing small ip packets?

[Erik Udo]

I came across this idea for prioritizing small
IP packets, so that for example HTTP requests,
game packets and other small, but importat packets
would get uploaded before the big packets. Big files
are usually uploaded in bigger packets, right?

So, i haven't found a way to make this happen, i googled
for it but didn't find anything. Does PF or IPFW have this
feature?