RE: agent_check_and_process: select info

	Then reboot!  Apps (any apps) should certainly be able to handle clock changes, forward or back, of a second or less, without blinking.  Time zone changes are nice to have, but some things barf on those (I have a cell phone that can't grasp the concept of moving between time zones).  Forward time changes should be handled transparently, as the ubiquity of suspendable machines would require, but I'm well accustomed to seeing that mishandled.  If you need to make a substantial change backwards to the time setting on your computer, just reboot it, as it's a safe bet that none of your software was tested against that use case.


	HTH,

Mike


> -----Original Message-----
> From: Sam V [mailto:[email protected]]
> Sent: Tuesday, September 15, 2009 11:36 AM
> To: net-snmp users
> Subject: RE: agent_check_and_process: select info
> 
> 
> 
>  Well, if ntpd starts up and time really of then there can be a big
> change,
> 
> 
> 
> 
> 
> > Subject: RE: agent_check_and_process: select info
> > Date: Tue, 15 Sep 2009 10:48:53 -0700
> > From: [email protected]
> > To: [email protected]
> > CC: [email protected]; [email protected]
> >
> > > From: Bart Van Assche [mailto:[email protected]]
> > > Sent: Monday, September 14, 2009 11:22 PM
> >
> >
> > > >> Thanks, let me know if you have an idea for a fix? It is easy to
> > > >> reproduce. Just let snmp agent run then set the system date and
> time
> > > >> backwards.
> > > >
> > > > What is the operational requirement for setting the clock
> > > backwards?  A remote-managed time machine?
> > >
> > > Please make yourself familiar with the operation of the ntpd
> process.
> > > ntpd can set the clock backwards, and this is a well documented
> aspect
> > > of the ntpd process.
> >
> > Perhaps I misunderstand. NTPD, in normal operation, changes the
> clocks by tiny amounts. As I read the problem, adjusting the clock
> backwards by ten microseconds would cause the snmp_select_info() call
> to not return until at least ten more microseconds had lapsed. This
> should hardly cause any real problem. Is the issue more severe than
> this?
> >
> >
> > Mike
> >
> 
> 
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