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Date:      Thu, 18 Jul 2002 18:26:48 +0800
From:      Eugene Grosbein <eugen@www.svzserv.kemerovo.su>
To:        stable@freebsd.org
Subject:   dummynmet shaper broken?
Message-ID:  <20020718182648.A47588@svzserv.kemerovo.su>

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Hi!

Try this:

1. enable ipfw, dummynet and rshd
2. ipfw pipe 10 config bw 10Kbyte/s queue 100
3. ipfw add 10 pipe 10 tcp from any to any shell via lo0
4. rsh localhost dd if=/dev/zero bs=16k count=1000 >/dev/null

Using my Celeron 366 I obtain not 10Kbyte/s but about 40-60Kbyte/s. 
Big difference. I tried 'ifconfig lo0 mtu 576', it gives the same speed
using same procedure. It seems dummynet shaper is broken, isn't it?

If I try to decrease queue size, speed increases, that is expected.

Eugene Grosbein

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