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Date: Wed, 3 May 2006 18:55:24 -0700
From: John-Mark Gurney <gurney_j@resnet.uoregon.edu>
To: tpeixoto@widesoft.com.br
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Cc: Lee Johnston <lee@wildcard.net.uk>, "."@babolo.ru,
	Julian Elischer <julian@elischer.org>, mihai@duras.ro,
	freebsd-net@freebsd.org
Subject: Re: Packet loss with traffic shaper and routing
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tpeixoto@widesoft.com.br wrote this message on Wed, May 03, 2006 at 22:40 -0300:
> Anyway, I am very curious about the result of test 2. Why do the pipes 
> have influence on system performance if there is nothing passing through 
> them?

It looks like each tick all the pipes are scanned...  In dummynet:
    /* Sweep pipes trying to expire idle flow_queues. */
    for (i = 0; i < HASHSIZE; i++)
        SLIST_FOREACH(pipe, &pipehash[i], next)

That bit of code should probably be run less often...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."