kern/140892: Incorrect cpu usage of per process under FreeBSD 8.0
wang jin
wangjin at myhexin.com
Thu Nov 26 09:50:03 UTC 2009
>Number: 140892
>Category: kern
>Synopsis: Incorrect cpu usage of per process under FreeBSD 8.0
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 26 09:50:03 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator: wang jin
>Release: FreeBSD 8.0
>Organization:
hexin
>Environment:
FreeBSD cachehm1 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Thu Nov 26 00:14:56 CST 2009 root at cachehm1:/usr/src/sys/amd64/compile/GENERIC amd64
>Description:
Squid is the main service of my box, and consumes most system resource.
I ran top command on my box,the output shows CPU1 has 8.6% user usage, but cpu usage of each process is 0.00%.
FreeBSD 7.2 has no such problem.
# top -CP
last pid: 68141; load averages: 0.15, 0.14, 0.10 up 0+17:04:07 17:21:00
45 processes: 1 running, 44 sleeping
CPU 0: 0.0% user, 0.0% nice, 3.0% system, 0.0% interrupt, 97.0% idle
CPU 1: 8.6% user, 0.0% nice, 1.1% system, 0.0% interrupt, 90.2% idle
Mem: 4293M Active, 2477M Inact, 791M Wired, 131M Cache, 827M Buf, 228M Free
Swap: 4096M Total, 4096M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME CPU COMMAND
4608 squid 17 44 0 783M 767M ucond 0 140:34 0.00% squid
1140 root 1 76 0 7232K 1492K piperd 0 1:31 0.00% sh
1139 root 1 44 0 8304K 2268K pause 1 0:05 0.00% top
1709 root 1 44 0 36912K 3820K select 1 0:03 0.00% sshd
953 bind 5 44 0 21356K 13656K kqread 0 0:02 0.00% named
1079 root 1 44 r0 7012K 1056K nanslp 0 0:02 0.00% watchdogd
1714 root 1 44 0 8252K 2456K pause 0 0:00 0.00% csh
1324 root 1 44 0 7976K 1388K select 0 0:00 0.00% inetd
1284 root 1 44 0 6920K 1340K nanslp 0 0:00 0.00% cron
878 root 1 44 0 5864K 1272K select 0 0:00 0.00% syslogd
67786 root 1 44 0 8304K 1872K CPU1 0 0:00 0.00% top
707 root 1 44 0 2180K 476K select 1 0:00 0.00% devd
1275 root 1 44 0 24980K 3380K select 1 0:00 0.00% sshd
1130 root 1 46 0 7232K 1420K wait 1 0:00 0.00% sh
1131 root 1 76 0 7232K 1452K wait 1 0:00 0.00% sh
1346 root 1 76 0 5860K 1056K ttyin 0 0:00 0.00% getty
1347 root 1 76 0 5860K 1056K ttyin 0 0:00 0.00% getty
1351 root 1 76 0 5860K 1056K ttyin 0 0:00 0.00% getty
1352 root 1 76 0 5860K 1056K ttyin 0 0:00 0.00% getty
1353 root 1 76 0 5860K 1056K ttyin 0 0:00 0.00% getty
1350 root 1 76 0 5860K 1056K ttyin 0 0:00 0.00% getty
1349 root 1 76 0 5860K 1056K ttyin 0 0:00 0.00% getty
1348 root 1 76 0 5860K 1056K ttyin 0 0:00 0.00% getty
4609 squid 1 46 0 2732K 688K piperd 1 0:00 0.00% unlinkd
130 root 1 76 0 2736K 852K pause 1 0:00 0.00% adjkerntz
>How-To-Repeat:
run top command.
Note:
The displayed CPU usage of some programs such as squid is too low, but this is not true for all types of programs.
I ran "sh test.sh", and the CPU usage of test.sh is nearly 100% which seems correct.
# cat test.sh
while true
do
done
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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