Date: Thu, 18 Aug 2005 13:17:36 -0400 From: "Michael R. Wayne" <wayne@staff.msen.com> To: freebsd-hackers@freebsd.org Subject: Reducing dummynet pipe size hangs system Message-ID: <200508181717.j7IHHaxW044139@manor.msen.com>
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Summary:
On an old (4.8p10) machine, substantially reducing the pipe size
on a loaded connection causes the system to freeze.
Is this a supported feature?
Did it usd to be broken?
Detail:
There's a 4.8p10 machine acting as a firewall (runs only ssh and
ipfw rules, hence the lack of updates). While trying to copy a
huge file from a local machine to a remote, the following ipfw
rules are in place:
ipfw add 10990 pipe 1 tcp from ${local_host} to ${remote_host}
ipfw pipe 1 config bw 256kbit/s queue 40KB
ipfw add 10991 pipe 2 tcp from ${remote_host} to ${local_host}
ipfw pipe 2 config bw 256Kbit/s queue 40KB
Since the flie is large enough to require several days to transfer, I
decided to tweak the pipe sizes off hours to permit it to go faster.
Crontab:
0 18 * * * root ipfw pipe 1 config bw 512kbit/s queue 40KB
1 18 * * * root ipfw pipe 2 config bw 512kbit/s queue 40KB
30 0 * * * root ipfw pipe 1 config bw 1024kbit/s queue 40KB
31 0 * * * root ipfw pipe 2 config bw 1024kbit/s queue 40KB
30 3 * * * root ipfw pipe 1 config bw 1200kbit/s queue 40KB
31 3 * * * root ipfw pipe 2 config bw 1200kbit/s queue 40KB
30 6 * * * root ipfw pipe 1 config bw 256kbit/s queue 40KB
31 6 * * * root ipfw pipe 2 config bw 256kbit/s queue 40KB
Two days in a row now, just after 6:30, the box freezes, refusing
keyboard input and requiring a reboot.
Queries:
Is this considered an unsupported use of dummynet?
If it should work, was it broken back in 4.8 and, if so, when
was it corrected? I'd rather not take the time up upgrade the
box to 4.11 if I'll then be forced to move to 5.4.
/\/\ \/\/
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