Flechsenhaar, Jon J wrote:
I don't know if you answer basic HTB questions but I'l try anyway. I'm
implementing AF and EF with a root rate of 500 kbps (kilo bits per
second). I am using DSMARK to classify packets. I'm implementing this
on two different hardware sets PPC and x86 with the same kernel options
configured.
Problem:
My root rate is going about 75 kbps over its 500kbps limit (ceil 500).
How are you measuring - htb and rate estimators see packets on eth an
iplen + 14.
I believe this is because of burst and cburst settings. I am using
default calculations now, on all classes. Is there a formula to use in
tweaking these
values? I would like my rates to follow the assigned rate more closely.
Hz and a compile time header change - HYSTERESIS 0 in
net/sched/sched_htb.c also affect accuracy.
I am generating traffic with a hardware traffic generator. Starting at
300 kbps stepping by 100 kbps up to 1mbps. Each step lasts for 60 sec.
Could give different results to normal tcp I suppose.
My config script is attached. Thanks.
tbf latency 0.01 on 256kbit is too short for a buffer IIRC it gets
rounded up so at least mtu packets get through.
I get an error on your script with iproute2-ss060323 and 2.6.17.11/7
++ /usr/sbin/tc qdisc change dev eth0 parent 2:20 gred DP 3 limit 60kb
min 10kb max 20kb avpkt 1500 burst 9 bandwidth 500kbit probability 0.06
prio 4
RTNETLINK answers: Invalid argument
after each DP 3 on each gred.
Andy.
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