On Friday 07 November 2003 18:34, Maria Joana Urbano wrote:
> Hi all,
>
> I am trying to tune tbf qdisc. My upstream configuration is as follows:
>
> tc qdisc add dev $DEV root handle 1: cbq avpkt 1000 bandwidth 100mbit
> tc class add dev $DEV parent 1:0 classid 1:1 cbq rate ${UP_RATE}kbit \
> allot 1500 prio 5 bounded
> tc qdisc add dev $DEV parent 1:1 handle 10: tbf rate ${UP_RATE}kbit \
> burst $BURST limit $LIMIT mtu $MTU
> tc filter add dev $DEV parent 1:0 protocol ip prio 18 u323 match ip \
> dst 0.0.0.0/0 flowid 1:1
>
> I tried several combinations of BURST (from 10KB until there is no pkt
> drops at tbf) and LIMIT values (corresponding to latencies of 40ms, 70ms
> and 140ms). MTU is set to 1500, the MTU of the link. I tested this
> configuration with several combinations of TCP flows and UDP flows
> (seperately). However, the best value I got for throughput was about 90%
> of UP_RATE.
>
> My question is: is it possible to get better results with tbf, with
> throughput values closer to UP_RATE? And what should be changed in the
> script above to get it better?
You don't need a tbf qdisc if you have a bounded class. The traffic is
already bounded by the cbq class.
Stef
--
stef.coene@xxxxxxxxx
"Using Linux as bandwidth manager"
http://www.docum.org/
#lartc @ irc.openprojects.net
_______________________________________________
LARTC mailing list / LARTC@xxxxxxxxxxxxxxx
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
