Dear all,
I am an experienced unix administrator and a long time ago (1+ year)
I made traffic-shaping system for an ISP (~400 clients).
Each ip address requires 4 classes -
2 for incoming (internet->client), one for international traffic,
the other for local-country and border-country traffic.
and
2 for outgoing (client->internet), for the same purposes.
Everything worked ok until last week, when more clients
were added. The data rate (rate NNkbit) is no longer stable -
sometimes it exceeds the rate specified and sometimes
there is starvation. And no, there is still planty of traffic
left, so its not a problem of bandwidth capacity.
The technique used is htb + sfq for traffic exceeding 0.8mbit/s,
for traffics up to 0.8mbit/s as it is not cpu-intensive
(but depends on HZ for calculations)
Are there any limits I am not aware of? It seems that everything
works ok again if I remove some addresses (single address /32 or
larger networks). I am not sure which part fails, filtering
or actual shaping.
And, it is vanilla Linux 2.4.20 with qos services coming with
it.
Also, i never came up with the other question: there has always
been problem with tbf. For example, rate 256kbit is specified but the
actual rate never exceeds 230 - 250kbit, so I add 30kbit for each
rate (so 256 becoms 286kbit) so client got exactly his 256kbit.
thanks,
P.Krumins
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