Bug 161906

Summary:	SNMP and vmstat do not match
Product:	Red Hat Enterprise Linux 3	Reporter:	Bad Mojo <mojo>
Component:	net-snmp	Assignee:	Radek Vokál <rvokal>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	3.0
Target Milestone:	---
Target Release:	---
Hardware:	ia64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-08-22 12:23:44 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Bad Mojo 2005-06-28 12:19:27 UTC

Description of problem:
# vmstat 1 10; snmpwalk -v2c -c public localhost systemStats
procs                      memory      swap          io     system         cpu
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy wa id
 0  0      0 1138080 258656 3305824    0    0     4    59 1911   826 48  2  0 50
 0  0      0 1138080 258656 3305824    0    0     0     4 2137   124  1  0  0 98
 0  0      0 1138080 258656 3305824    0    0     0     0 2118   113  1  0  0 99
 0  0      0 1138080 258656 3305824    0    0     0     0 2089   109  0  0  0 100
 0  0      0 1138080 258656 3305824    0    0     0     0 2077    81  0  0  0 100
 0  0      0 1138080 258656 3305824    0    0     0    68 2071    89  0  0  0 100
 0  0      0 1138080 258656 3305824    0    0     0     0 2057    64  0  0  0 100
 0  0      0 1138080 258656 3305824    0    0     0     0 2072    87  0  0  0 100
 0  0      0 1138080 258656 3305824    0    0     0     0 2059    67  0  0  0 100
 0  0      0 1138080 258656 3305824    0    0     0     0 2149    82  5  0  0 95
UCD-SNMP-MIB::ssIndex.0 = INTEGER: 1
UCD-SNMP-MIB::ssErrorName.0 = STRING: systemStats
UCD-SNMP-MIB::ssSwapIn.0 = INTEGER: 0
UCD-SNMP-MIB::ssSwapOut.0 = INTEGER: 0
UCD-SNMP-MIB::ssIOSent.0 = INTEGER: 4
UCD-SNMP-MIB::ssIOReceive.0 = INTEGER: 59
UCD-SNMP-MIB::ssSysInterrupts.0 = INTEGER: 1915
UCD-SNMP-MIB::ssSysContext.0 = INTEGER: 828
UCD-SNMP-MIB::ssCpuUser.0 = INTEGER: 47
UCD-SNMP-MIB::ssCpuSystem.0 = INTEGER: 2
UCD-SNMP-MIB::ssCpuIdle.0 = INTEGER: 50
UCD-SNMP-MIB::ssCpuRawUser.0 = Counter32: 657964637
UCD-SNMP-MIB::ssCpuRawNice.0 = Counter32: 33681
UCD-SNMP-MIB::ssCpuRawSystem.0 = Counter32: 27743292
UCD-SNMP-MIB::ssCpuRawIdle.0 = Counter32: 687051308
UCD-SNMP-MIB::ssRawInterrupts.0 = Counter32: 2567422935
UCD-SNMP-MIB::ssRawContexts.0 = Counter32: 1110246982

Essentially, vmstat and snmp do not seem to display similar data. Even if I set
up an MRTG graph to use the ssCpuRaw* IODs to map CPU usage, the data is well
off from what load the system is actually seeing. The load information from SNMP
does seem to match actual system load.


Version-Release number of selected component (if applicable):

net-snmp-utils-5.0.9-2.30E.15
net-snmp-5.0.9-2.30E.15
net-snmp-libs-5.0.9-2.30E.15

How reproducible:

Very.

Steps to Reproduce:
1. See the first section.

Additional info:
This is running in a dell 7250 itanium server and is therefore using the ia64 RHEL.

Comment 1 Radek Vokál 2005-08-22 12:23:44 UTC

 (In reply to comment #0)
> procs                      memory      swap          io     system         cpu
>  r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy wa id
>  0  0      0 1138080 258656 3305824    0    0     4    59 1911   826 48  2  0 50

I think the values you get are quite similar to the first line of vmstat output
(If I'm comparing correctly last 5 numbers)