Hi,
I'm trying to slow down http traffic on Gigabit link. The outbound rates on
that interface range 0 .. 400 Mbit/s and I would like to throttle accurately
to any rate between these while keeping non-http traffic unthrottled.
What I do is to create a PRIO qdisc with the 3 usual bands (default prio
mask) and a 4th band with a TBF attached with the desired rate. Like this
(for 300 mbit/s):
tc qdisc add dev eth0 root handle 1: prio bands 4
tc qdisc add dev eth0 parent 1:4 handle 40: tbf \
rate 300mbit buffer 600kb latency 600ms
tc filter add dev eth0 parent 1:0 protocol ip u32 \
match ip sport 80 0xffff flowid 1:4
What it happens is that I actually get a slow-down but at rates of 200-250
instead of 300.
What am I doing wrong?
Javier
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