Rafal Krypa wrote:
Hi.
I would like to ask you for advice.
I am trying to construct following shaping solution:
* several users are using one link to the Internet
* all of them have equal priority and should be given fair amount of bandwidth
* no kind of traffic is considered more important than other
* our Internet connection has no CIR, only "maximum dl/ul speeds" given by
provider
What you can or can't do will depend on the exact nature and behavior of
the link.
* most important: our outgoing and incoming traffic must be shaped to some rate
that will provide possibly low latency. For users that do not have active
connections I'd like to ensure no more than 100ms latency for ping or any
other low-traffic connections
100ms - that would be hard to guarantee on a slow fixed rate link, in
some situations you may need to sacrifice 50% of ingress bandwidth.
It depends on how fast the link is and how slow it gets and how it is
slowed.
For several years of my experiments with traffic shaping over Linux I found no
tool for creating such system. For example, HTB require given, constant 'ceil'
parameter. I would like to have some qdisc that can automatically adjush its
rate/ceil parameter depending on achieved latency. The rest of the job would be
quite pretty done by ESFQ.
Could you point me to anything adequate to my needs?
There is no qdisc that has variable rates.
I've just got a link with variable down speed and have played around
with policers to see what's possible. I haven't done much and it doesn't
work too well - though it works enough to carry on trying to see what's
possible. I still don't know whether it can ever work enough to be left
"unnatended".
If you have few users and know your traffic and have a fairly fast link
and know how it behaves there may be a way - at least to do alot better
than doing nothing.
Andy.
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