Date: Sun, 18 Jan 2009 02:11:15 +0200 From: "Miroslav Slavkov" <miroslav@svishtov.net> To: freebsd-net@freebsd.org Subject: dummynet high cpu load Message-ID: <20090118021115.53633c6a@mail.svishtov.net>
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Hello,
I have a strange thing going on with dummynet. I'm loading around 11000=
pipes.
The machine does not forward, generate or receive any traffic. The only=
running service is ssh. It's for developing purposes.
The thing happening is when loading more than 10700 pipes. The dummynet=
process begins to eat around %50 of cpu. If i load only 10000 pipes, it=
is using 0% cpu.
=20
Some output:
# ipfw show
65535 612000 126865054 allow ip from any to any
# ipfw pipe show| wc -l
10001
# top -Sd 2
last pid: 35787; load averages: 0.11, 0.17, 0.16 =
up 0+11:29:29 01=
:53:51
73 processes: 6 running, 53 sleeping, 14 waiting
CPU: 0.0% user, 0.0% nice, 25.1% system, 0.2% interrupt, 74.7% idle
Mem: 23M Active, 20M Inact, 156M Wired, 48K Cache, 38M Buf, 781M Free
Swap: 4096M Total, 4096M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU C=
OMMAND
12 root 1 171 ki31 0K 16K RUN 0 566:04 99.37% i=
dle: cpu0
11 root 1 171 ki31 0K 16K RUN 1 459:35 99.07% i=
dle: cpu1
36 root 1 -68 - 0K 16K CPU0 0 343:55 0.00% d=
ummynet
Still.. while loading the rules (one row per pipe config, with script fo=
r pipe counting...) the dummynet process begins to raise the usage after=
4000 or some pipes. It gets to 0% after 10-20 secs.
# ipfw pipe show | wc -l
10701
# top -Sd2
last pid: 57219; load averages: 0.32, 0.23, 0.18 =
up 0+11:37:13 02=
:01:35
73 processes: 5 running, 54 sleeping, 14 waiting
CPU: 0.0% user, 0.0% nice, 25.2% system, 0.0% interrupt, 74.8% idle
Mem: 23M Active, 21M Inact, 156M Wired, 48K Cache, 38M Buf, 781M Free
Swap: 4096M Total, 4096M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU C=
OMMAND
11 root 1 171 ki31 0K 16K RUN 1 465:48 91.26% i=
dle: cpu1
12 root 1 171 ki31 0K 16K RUN 0 568:09 59.38% i=
dle: cpu0
36 root 1 -68 - 0K 16K CPU0 0 350:22 51.56% d=
ummynet
# uname -rp
7.1-STABLE amd64
The system is last updated on 15 Jan 2009.
The pipes are simple enough: ipfw pipe X config bw =3F=3F=3F=3FKbit/s
Seems strange, because no rules are applied. The load is still around 50=
% even if the firewall is turned off with the sysctl option.
Any clues=3F
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