sar, mpstat report extraneous CPU

[Bryan Veal]

Binary package hint: sysstat

Source package sysstat 8.0.3-1ubuntu1

Description: Ubuntu 8.04.1
Release: 8.04

sysstat:
  Installed: 8.0.3-1ubuntu1
  Candidate: 8.0.3-1ubuntu1
  Version table:
 *** 8.0.3-1ubuntu1 0
        500 http://us.archive.ubuntu.com hardy/main Packages
        100 /var/lib/dpkg/status

Sar and mpstat produce an extra CPU in their utilization outputs. Expected 8 CPUs, but got 9:

beveal@nsa-smaug:~$ mpstat -P ALL 1 1
Linux 2.6.24-19-server (nsa-smaug) 10/14/2008

01:40:35 PM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s
01:40:36 PM all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 30.00
01:40:36 PM 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 3.00
01:40:36 PM 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 3.00
01:40:36 PM 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
01:40:36 PM 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
01:40:36 PM 4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 3.00
01:40:36 PM 5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
01:40:36 PM 6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
01:40:36 PM 7 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
01:40:36 PM 8 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Average: CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s
Average: all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 30.00
Average: 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 3.00
Average: 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 3.00
Average: 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
Average: 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
Average: 4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 3.00
Average: 5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
Average: 6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
Average: 7 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 4.00
Average: 8 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

beveal@nsa-smaug:~$ sar -P ALL 1 1
Linux 2.6.24-19-server (nsa-smaug) 10/14/2008

01:41:18 PM CPU %user %nice %system %iowait %steal %idle
01:41:19 PM all 0.00 0.00 0.00 0.00 0.00 100.00
01:41:19 PM 0 0.00 0.00 0.00 0.00 0.00 100.00
01:41:19 PM 1 0.00 0.00 0.00 0.00 0.00 100.00
01:41:19 PM 2 0.00 0.00 0.00 0.00 0.00 100.00
01:41:19 PM 3 0.00 0.00 0.00 0.00 0.00 100.00
01:41:19 PM 4 0.00 0.00 0.00 0.00 0.00 100.00
01:41:19 PM 5 0.00 0.00 0.00 0.00 0.00 100.00
01:41:19 PM 6 0.00 0.00 0.00 0.00 0.00 100.00
01:41:19 PM 7 0.00 0.00 0.00 0.00 0.00 100.00
01:41:19 PM 8 0.00 0.00 0.00 0.00 0.00 0.00

Average: CPU %user %nice %system %iowait %steal %idle
Average: all 0.00 0.00 0.00 0.00 0.00 100.00
Average: 0 0.00 0.00 0.00 0.00 0.00 100.00
Average: 1 0.00 0.00 0.00 0.00 0.00 100.00
Average: 2 0.00 0.00 0.00 0.00 0.00 100.00
Average: 3 0.00 0.00 0.00 0.00 0.00 100.00
Average: 4 0.00 0.00 0.00 0.00 0.00 100.00
Average: 5 0.00 0.00 0.00 0.00 0.00 100.00
Average: 6 0.00 0.00 0.00 0.00 0.00 100.00
Average: 7 0.00 0.00 0.00 0.00 0.00 100.00
Average: 8 0.00 0.00 0.00 0.00 0.00 0.00

/proc/stat shows 8 CPU cores:

beveal@nsa-smaug:~$ cat /proc/stat
cpu 114615 0 87142 282247451 1584759 1025 11119 0 0
cpu0 733 0 11665 35283693 201761 154 1594 0 0
cpu1 884 0 11259 35290544 203015 154 1511 0 0
cpu2 857 0 11316 35285813 203754 109 1516 0 0
cpu3 590 0 10325 35285524 207748 142 1335 0 0
cpu4 314 0 10511 35298465 195099 138 1298 0 0
cpu5 260 0 10723 35309843 182359 88 1276 0 0
cpu6 318 0 10757 35300432 195472 144 1423 0 0
cpu7 110659 0 10586 35193137 195551 96 1166 0 0
intr 5849156 2900333 8 0 0 0 0 0 0 1 0 0 0 131 0 99 0 803100 0 0 0 1324991 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 643075 177418 0 0 0 0 0
ctxt 7417360
btime 1223662157
processes 9694
procs_running 1
procs_blocked 0

[Jean-Baptiste Lallement (jibel)]

Thanks for your report.

This has been fixed upstream in 8.1.1 and is available in Intrepid.

 * The number of processors was not properly calculated on
   machines where a directory named cpuidle was present in the
   /sys/devices/system/cpu directory [GENTOO bug# 207886].

Please see https://wiki.ubuntu.com/StableReleaseUpdates if you would like to pursue
a fix in stable releases.