Bug 84323 - sar data anomaly
sar data anomaly
Status: CLOSED DEFERRED
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: sysstat (Show other bugs)
2.1
All Linux
medium Severity low
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Assigned To: Charlie Bennett
Brian Brock
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Depends On:
Blocks:
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Reported: 2003-02-14 08:42 EST by Larry Troan
Modified: 2016-04-18 05:39 EDT (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2004-05-10 01:14:49 EDT
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Description Larry Troan 2003-02-14 08:42:10 EST
We observed unexpected data reported from sar tool.  For example, there are
large discrepancy between what sar report and what vmstat report on system
utilization.

On a system with some workload, e.g, a kernel compile, vmstat report 92/3/5 on
user/sys/idle utilization, but sar -u would report something out of chart.  The
data presented from /proc/stat looks fine, seems to be a problem in the sar tool
parsing through /proc/stat data.  This is just one problem we observed, can
redhat verify all other stats reported by sar to be correct?

[kwchen@linux-t11 tpc16]$ vmstat 5
   procs                      memory    swap          io     system         cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
 4  0  0      0 620288 175280 1071696   0   0     0     1    1     0   1   0   1
 6  0  0      0 743648 174464 990624   0   0     0   956 4245   708  93   3   4
 5  0  0      0 744688 174672 995664   0   0     0  1071 4247   696  92   3   5
 7  0  0      0 746352 174784 1001200   0   0     0   826 4241   700  96   3   1
 4  0  0      0 705328 174912 1010368   0   0     0  1904 4257   685  91   3   6


[kwchen@linux-t11 tpc16]$ sar -u 5 0
Linux 2.4.18-e.14smp (linux-t11)        02/07/2003

11:04:55 AM       CPU     %user     %nice   %system     %idle
11:05:20 AM       all    956.65      0.00     32.35     35.00
11:05:25 AM       all    940.80      0.00     33.55     49.65
11:05:30 AM       all    973.75      0.00     31.40     18.85
11:05:35 AM       all    939.10      0.00     32.10     52.80
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Action by: kennethchen
Issue Registered

ISSUE TRACKER 15460 OPENED BY INTEL AS SEV 3.
Comment 1 Larry Troan 2003-07-14 13:45:18 EDT
Is this still a problem in QU2 errata?
Comment 2 Larry Troan 2003-09-22 12:00:18 EDT
FROM ISSUE TRACKER
 Event posted 07-31-2003 02:28pm by kennethchen with duration of 0.00       
 yes, it is still a problem in AS2.1 QU2.
 One additional information: EL3-beta 1 seems to have the bug fixed.
Comment 3 Larry Troan 2004-03-29 11:16:32 EST
Is this fixed in the RHEL2.1 U4 beta?
Comment 4 Frank Hirtz 2004-04-12 11:40:23 EDT
<from client> 
No. We checked U4 beta, the bug is still there:
12:58:28 PM       CPU     %user     %nice   %system     %idle
12:58:30 PM         0      0.00      0.00      0.50    1023.50
12:58:30 PM         1     50.00      0.00     29.00    945.00
12:58:30 PM         2      0.50      0.00      1.50    1022.00
12:58:30 PM         3     33.00      0.00     59.50    931.50
Comment 5 Frank Hirtz 2004-05-10 01:14:49 EDT
Closing as I'm pushing this through standard support channels.

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