RE: Round Trip Time bias

[John.Carr]

It appears suddenly when I restart IM without rebooting.   I don’t know if this chart will make it thru the list server, but I’ll give it a try.     At ~10AM Mon, I restarted the IM server.  At ~2PM, I started the IM application.  At ~9PM, I restarted the server again.   These servers are on the same LAN as the IM server, but the same bias is also evident on the WAN devices (though the effect is less dramatic).  I’m not sure it’s something in the IM application (I kind of doubt it), but maybe something in the OS not being cleaned up properly when IM quits.  The fact the Finder ALWAYS quits when I quit IM is also suspect. I have bumped up the IM memory size by 10M (to 26384kB).  The computer is running 9.2.2 and has 128MB of RAM.  IM is using 14302kB.    -----Original Message----- From: Richard E. Brown [mailto:[EMAIL PROTECTED]] Sent: Thursday, December 26, 2002 7:31 AM To: [EMAIL PROTECTED] Subject: Re: Round Trip Time bias   John:   This is peculiar. Have you ever plotted the ping times to see if this comes on suddenly or gradually?   Rich Brown Dartware, LLC --- You wrote: I'm using IM 3.7.1 Classic with MacOS 9.2.  Intermapper is the only thing running on the system.   One of the parameters I monitor is round-trip time to many of the monitored. I've noticed that after I restart the system, RTT to "close" (same LAN) devices is small, as expected (1-3 msec, typically).  Devices reachable across WAN links are longer, of course (~20msec).  These are the times I expect and are consistent with the RTT's obtained when pinging from other, non-IM devices.   But after IM has been running for a while, or after it has been stopped and restarted, there is a bias of ~15-20 msec added to all the times.  LAN RTT's become ~18-20, WAN RTT's become ~35-40msec and stay there until I restart the computer when they return to their low values.  Ping times from other non-IM devices remain small as above.   Perhaps related, I notice that whenever I quit IM, Finder also quits.  This happens every time. --- end of quote ---   ____________________________________________________________________ Note: To unsubscribe from this mailing list, please send email to: <mailto:[EMAIL PROTECTED]> Thanks!