Date: Thu, 26 Nov 2009 09:46:27 GMT From: wang jin <wangjin@myhexin.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/140892: Incorrect cpu usage of per process under FreeBSD 8.0 Message-ID: <200911260946.nAQ9kRbZ035072@www.freebsd.org> Resent-Message-ID: <200911260950.nAQ9o3R7090131@freefall.freebsd.org>
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>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@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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