ALTQ/pf troubles

Alexander S. Usov A.S.Usov at
Fri Oct 1 06:55:20 PDT 2004

On Friday 01 October 2004 15:28, Brian Fundakowski Feldman wrote:
> On Mon, Sep 27, 2004 at 10:40:00PM +0200, Alexander S. Usov wrote:
> > Hello !!
> > Just enabling the queueing on the interface with bandwidth == DSL
> > bandwidth results in the appox. factor of 2 drop in the speed of the
> > outgoing transfers.
> >
> > >From my experiments I got an impression that to make this slow-down
> >
> > away I have to specify the bandwith around 700Kb, which is twice bigger
> > than real.
> Are you telling ALTQ to process _incoming_ packets?

According to the pf manuals it should process only outgoing packets.
And I believe it's the case as the incoming rate doesn't depends on queieing 

Just did an experiment adding only this 2 lines:
altq on $ext priq bandwidth 350Kb queue {q}
queue q priority 1 priq(default)
and no queue statements in the filtering rules.

If I understand the logick of the pf right, it means to create an outbound
queue on $ext with bandwith 350Kb and put all outgoing traffic into it (due to 
the (default) statement).

This results in the outgoing transfer speed of appox. 18KB/s, and incoming is
unaffected and is approx. 117KB/s.

Increasing bandwith in the altq rule to 700Kb, results in the upload speed of 
approx. 30-34 KB/s.

Is it a good idea to check the behavior of the ruleset with OpenBSD?

Best regards,

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