--As of December 17, 2011 10:29:42 AM +0200, Коньков Евгений
is alleged to have said:
How to debug why system do not use free CPU resouces?
On this pictures you can see that CPU can not exceed 400tics
http://piccy.info/view3/2368839/c9022754d5fcd64aff04482dd360b5b2/
http://piccy.info/view3/2368837/a12aeed98681ed10f1a22f5b5edc5abc/
http://piccy.info/view3/2368836/da6a67703af80eb0ab8088ab8421385c/
On these pictures you can see that problems begin with trafic on re0
when CPU load rise to "maximum"
http://piccy.info/view3/2368834/512139edc56eea736881affcda490eca/
http://piccy.info/view3/2368827/d27aead22eff69fd1ec2b6aa15e2cea3/
But there is 25% CPU idle yet at that moment.
<snip>
# top -SIHP
last pid: 93050; load averages: 1.45, 1.41, 1.29
up 9+16:32:06 10:28:43 237 processes: 5 running, 210 sleeping, 2
stopped, 20 waiting
CPU 0: 0.8% user, 0.0% nice, 8.7% system, 17.7% interrupt, 72.8% idle
CPU 1: 0.0% user, 0.0% nice, 9.1% system, 20.1% interrupt, 70.9% idle
CPU 2: 0.4% user, 0.0% nice, 9.4% system, 19.7% interrupt, 70.5% idle
CPU 3: 1.2% user, 0.0% nice, 6.3% system, 22.4% interrupt, 70.1% idle
Mem: 843M Active, 2476M Inact, 347M Wired, 150M Cache, 112M Buf, 80M Free
Swap: 4096M Total, 15M Used, 4080M Free
--As for the rest, it is mine.
You are I/O bound; most of your time is spent in interrupts. The CPU is
dealing with things as fast as it can get them, but it has to wait for the
disk and/or network card to get them to it. The CPU is not your problem;
if you need more performance, you need to tune the I/O. (And possibly get
better I/O cards, if available.)
Daniel T. Staal
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