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Old 7th October 2010
badkuk badkuk is offline
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Default high cpu usage by system process

Hi peeps,

Recently i've noticed a significant slowdown on an old OpenBSD 3.5 box, which we run IPSec/VPN on. System load consistently reached 2.70+, and upon closer investigation it seems the system process hogs up the cpu.

We're using some el cheapo NICs on it, so i began to suspect that maybe the box is getting drowned in interrupts...but the systat reports below doesn't suggest that:

************************************************** ************************************************** **
load averages: 2.58, 2.50, 2.27 18:21:36

14 processes: 1 running, 13 idle

CPU states: 0.0% user, 0.0% nice, 96.2% system, 0.4% interrupt, 3.3% idle

Memory: Real: 4764K/60M act/tot Free: 439M Swap: 0K/4093M used/tot



PID USERNAME PRI NICE SIZE RES STATE WAIT TIME CPU COMMAND

4930 root 2 0 308K 992K idle select 0:00 0.00% sshd

5549 root 28 0 216K 860K run - 0:00 0.00% top

31061 root 2 0 292K 564K idle select 0:00 0.00% cron

5500 _syslogd 2 0 172K 496K idle poll 0:00 0.00% syslogd

23416 root 2 0 364K 1476K sleep select 0:00 0.00% sshd

1 root 10 0 368K 228K idle wait 0:00 0.00% init

11404 root 18 0 340K 304K idle pause 0:00 0.00% csh

22485 root 2 0 144K 456K idle netio 0:00 0.00% syslogd

31382 root 3 0 92K 476K idle ttyin 0:00 0.00% getty

13179 root 2 0 104K 492K idle select 0:00 0.00% inetd

19389 root 3 0 84K 476K idle ttyin 0:00 0.00% getty

10293 root 3 0 88K 476K idle ttyin 0:00 0.00% getty

19331 root 3 0 56K 476K idle ttyin 0:00 0.00% getty

20411 root 3 0 56K 476K idle ttyin 0:00 0.00% getty





************************************************** ************************
output of systat :io



/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10

Load Average ||||||||||||||||||



/0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100

cpu user|

nice|

system|XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXX

interrupt|

idle|



/0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100

wd0 Kps|

tps|


************************************************** ************************

output of systat :swap





/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10

Load Average ||||||||||||||



Disk 1K-blocks Used /0% /10% /20% /30% /40% /50% /60% /70% /80% /90% /100%

swap_ 4191248 0





************************************************** ************************

output of mbufs:





/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10

Load Average >>>>>>>>>>>



/0 /5 /10 /15 /20 /25 /30 /35 /40 /45 /50 /55 /60

sockets XXX

data X

headers X




************************************************** ************************

output of pigs:





/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10

Load Average <<<<<<<<<<<<<<



/0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100

<idle> XXXXXXXXXXXXX





************************************************** ************************

1 users Load 2.19 2.72 2.51 Thu Oct 7 18:27:26 2010



memory totals (in KB) PAGING SWAPPING Interrupts

real virtual free in out in out 8506 total

Active 4948 4948 449388 ops 100 clock

All 61624 61624 4640632 pages 4593 rl0

128 rtc

Proc:r d s w Csw Trp Sys Int Sof Flt forks 3685 vr0

2 56 7 44 13210 1 10 fkppw pciide1

fksvm

91.3% Sys 0.0% User 0.0% Nice 8.4% Idle pwait

| | | | | | | | | | | relck

============================================== rlkok

noram

Namei Sys-cache Proc-cache No-cache ndcpy

Calls hits % hits % miss % fltcp

13 13 100 1 8 -1 -8 1 zfod

cow

Disks wd0 128 fmin

seeks 170 ftarg

xfers itarg

Kbyte 54 wired

sec pdfre

Showing vmstat, refresh every 5 seconds.




************************************************** ************************

i'm beginning to suspect that maybe the box can't handle all that VPN/IPSec processing; what else can i check to determine this?

And how to do i solve this btw? Currently the box has 512MB RAM and a P4 2.0Ghz processor; i doubt if bumping up the RAM and going dual core is going to solve things...

tia
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