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.
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 COMMAND
12 root 1 171 ki31 0K 16K RUN 0 566:04 99.37% idle:
cpu0
11 root 1 171 ki31 0K 16K RUN 1 459:35 99.07% idle:
cpu1
36 root 1 -68 - 0K 16K CPU0 0 343:55 0.00% dummynet
Still.. while loading the rules (one row per pipe config, with script for 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 COMMAND
11 root 1 171 ki31 0K 16K RUN 1 465:48 91.26% idle:
cpu1
12 root 1 171 ki31 0K 16K RUN 0 568:09 59.38% idle:
cpu0
36 root 1 -68 - 0K 16K CPU0 0 350:22 51.56% dummynet
# 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 ????Kbit/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?
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