bin/160494: bsnmpd returns inaccurate data for hrSystemProcesses OID

Jeremy Chadwick freebsd at jdc.parodius.com
Tue Sep 6 16:00:08 UTC 2011


The following reply was made to PR bin/160494; it has been noted by GNATS.

From: Jeremy Chadwick <freebsd at jdc.parodius.com>
To: FreeBSD-gnats-submit at FreeBSD.org, freebsd-bugs at FreeBSD.org
Cc: Sylvio C?sar Teixeira Amorim <scjamorim at bsd.com.br>
Subject: Re: bin/160494: bsnmpd returns inaccurate data for hrSystemProcesses
 OID
Date: Tue, 6 Sep 2011 08:55:52 -0700

 On Tue, Sep 06, 2011 at 08:41:39AM -0300, Sylvio C?sar Teixeira Amorim wrote:
 > Do a patch and send me.
 
 I had a chance to review the net-snmp code.  My previous claim was
 incorrect -- net-snmp DOES NOT suffer from the problem documented in
 this PR.  The code in net-snmp which uses kvm_getprocs(3) is for the
 hrSW*Run OIDs, which (properly) uses KERN_PROC_ALL to ensure they count
 kernel threads for kernel modules.
 
 The hrSystemProcesses OID with net-snmp returns the correct number of
 system processes (not including threads).  Verification:
 
 icarus# snmpwalk -v2c -c public localhost hrSystemProcesses
 HOST-RESOURCES-MIB::hrSystemProcesses.0 = Gauge32: 60
 
 So this PR/issue is specific to bsnmpd.  Sorry to waste your time,
 Sylvio!
 
 The PR should remain open as bsnmpd needs to be fixed.
 
 -- 
 | Jeremy Chadwick                                jdc at parodius.com |
 | Parodius Networking                       http://www.parodius.com/ |
 | UNIX Systems Administrator                   Mountain View, CA, US |
 | Making life hard for others since 1977.               PGP 4BD6C0CB |
 


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