Dear Ladies and Gentlemen,
The problem reported and unreported earlier about excessive CPU usage of
17 Oct 2003 CVS vs ntop 2.2 on FreeBSD 4.8-RELEASE-p13 (RELEASE +
security fixes; not STABLE) is related to network load: the CPU usage
climbs massively when ntop is monitoring a 128 kbps stream (ssh file
transfer).
The topology is
Central Site ------ 128 kbps WAN --- test site (10 Mbps switched)
|
|
ntop (getting mirrored traffic)
Tssyd
File transfer (scp) - of the the bzip2 compressed ntop source to the
test site.
pc09011> scp ntop-cvs.tar.bz2 tssyd:build/
ntop-cvs.tar.bz2 100%
|***************************************************************************************************************************|
2570 KB 01:27
pc09011>
With 2.2, ntop hardly puffs thruought the file transfer:
tssyd# perl -e 'foreach (1..100) { @x=`top -b`; print @x[0..10], "\n";
sleep 30 }'
last pid: 92106; load averages: 0.06, 0.01, 0.00 up 7+20:12:34
10:53:40
23 processes: 1 running, 21 sleeping, 1 zombie
Mem: 25M Active, 15M Inact, 15M Wired, 4216K Cache, 15M Buf, 2416K Free
Swap: 250M Total, 756K Used, 249M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
92100 anwsmh 2 0 5376K 1708K select 0:02 1.72% 1.71% sshd
92059 nobody 2 0 16432K 9456K poll 0:06 0.39% 0.39% ntop
78 root 2 0 2584K 876K select 1:37 0.00% 0.00% sshd
last pid: 92107; load averages: 0.03, 0.01, 0.00 up 7+20:13:04
10:54:10
19 processes: 1 running, 17 sleeping, 1 zombie
Mem: 24M Active, 14M Inact, 15M Wired, 4216K Cache, 15M Buf, 3520K Free
Swap: 250M Total, 756K Used, 249M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
92059 nobody 2 0 16432K 9456K poll 0:07 0.05% 0.05% ntop
78 root 2 0 2584K 876K select 1:37 0.00% 0.00% sshd
69 root 2 0 1296K 572K select 0:42 0.00% 0.00% ntpd
With 2.2.95:
Mem: 24M Active, 12M Inact, 15M Wired, 5820K Cache, 15M Buf, 4300K Free
Swap: 250M Total, 756K Used, 249M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
92131 nobody 2 0 16660K 9752K poll 1:10 1.46% 1.46% ntop
78 root 2 0 2584K 884K select 1:38 0.00% 0.00% sshd
69 root 2 0 1296K 572K select 0:42 0.00% 0.00% ntpd
last pid: 92175; load averages: 0.23, 0.18, 0.08 up 7+20:20:52
11:01:58
22 processes: 3 running, 19 sleeping
Mem: 25M Active, 12M Inact, 15M Wired, 5820K Cache, 15M Buf, 3172K Free
Swap: 250M Total, 756K Used, 249M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
92131 nobody 31 0 16660K 9764K RUN 1:22 35.50% 35.50% ntop
92172 anwsmh 28 0 5376K 1692K RUN 0:01 1.54% 1.12% sshd
92175 root 29 0 1868K 844K RUN 0:00 7.00% 0.34% top
last pid: 92176; load averages: 0.56, 0.27, 0.12 up 7+20:21:23
11:02:29
22 processes: 2 running, 20 sleeping
Mem: 25M Active, 12M Inact, 15M Wired, 5820K Cache, 15M Buf, 3172K Free
Swap: 250M Total, 756K Used, 249M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
92131 nobody 42 0 16660K 9764K RUN 1:43 60.45% 60.45% ntop
92172 anwsmh 2 0 5376K 1692K select 0:02 2.29% 2.15% sshd
78 root 2 0 2584K 884K select 1:38 0.00% 0.00% sshd
last pid: 92177; load averages: 0.54, 0.29, 0.13 up 7+20:21:53
11:02:59
22 processes: 2 running, 20 sleeping
Mem: 25M Active, 12M Inact, 15M Wired, 5820K Cache, 15M Buf, 3168K Free
Swap: 250M Total, 756K Used, 249M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
92131 nobody 42 0 16660K 9768K RUN 2:03 64.45% 64.45% ntop
92172 anwsmh 2 0 5376K 1692K select 0:03 2.52% 2.49% sshd
78 root 2 0 2584K 884K select 1:38 0.00% 0.00% sshd
Yours sincerely.
--
------------------------------------------------------------------------
Stanley Hopcroft
------------------------------------------------------------------------
'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'
from Meditation 17, J Donne.
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