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SubjectRe: bandwidth for (good news)
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On Saturday 30 August 2003 21:39, Andrea Arcangeli wrote:
> On Sun, Aug 31, 2003 at 03:05:37AM +0200, Pascal Schmidt wrote:
> > On Sat, 30 Aug 2003, Larry McVoy wrote:
> > >> All you have to do is drop the incoming packets if they exceed
> > >> a certain bandwidth.
> > >
> > > If you think we haven't done that, think again.
> > >
> > > We're at the wrong end of the pipe to do that, I'm pretty sure that
> > > what you are describing simply won't work.
> >
> > In a way, you're on the right end of the pipe because the system
> > that does your traffic shaping is part of the general network, viewed
> > from the machines behind the shaper.
> >
> > Dropping the packets means that the sending side, at least if we're
> > talking TCP, will throttle its sending rate. But, depending on the
> > distance in hops to the sender, it may take up to a few seconds for
> > this to kick in. So I guess that's why it doesn't work for your
> > VoIP case - the senders don't notice fast enough that they should
> > slow down.
> that's because you don't limit the to a fixed rate. If you
> want to give priorities, it won't work well because it takes time to be
> effective, but if you rate limit hard both ways it has to work, unless
> you're under syn-flood ;) The downside is that you will waste bandwith
> (i.e. you will hurt the service even when you don't use
> voip), but it will work.

How about giving something to voip as a hard limit and then using some shaper
to give it more if needed.


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