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    Network latencies

    We have had two ongoing problems that I think are network latency issues at their root. One is that AutoCAD will often claim there is no license server, requiring a user to type in the license server name (twice, thank you Autodesk ) before they can get a license. Also, we are seeing what seems like a pretty high incidence of corrupt central files, which I believe can be triggered by excessive latency. I can fix the first problem by using the kludge of setting the FLEXLM_TIMEOUT environment variable to a high value, as you would when accessing a license server over a WAN. Which certainly says to me that the acad problem is truly a latency issue.
    We are on a gigabit network, but with a long run to the server room in the basement, as well as a network infrastructure that isn't necessarily tuned for Revit use. So I am looking for some insight into just what "excessive" network latency would be. If there is some threshold value beyond which problems are known to arise, I can perhaps get IT to test our latency and show that we have a systemic problem. Or not.
    Anyone have any data on the topic?

    Thanks!
    Gordon
    Pragmatic Praxis

    #2
    Any sort of network shaper in use? What kind of routers are in use? How old is the oldest part of your network? How many people are we talking accessing the server at once? What kind of files are they accessing? What is the network storage configuration? What are the server configurations? What kind of internet access do you have?

    Excessive LAN latency would be IMO anything over 10ms. Maybe 20ms for a lot of users and slow network storage.

    I would suspect that there is something in your network that is key and itsnt running at peak preformance. Like an 15 year old switch, or hub. They do break down with age.
    -Alex Cunningham

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      #3
      Interesting. To get the details will require bugging IT, but as far as those values, even the License server is showing latency less than 1ms. Assuming that the
      Code:
      time<1ms
      bit from a PING is the same thing. And yet bumping up to 100 ms (100,000 microseconds is the actual value) solves the license timeout problem.

      Monday isn't the day you really want to deal with things that make you say "Hmmm...."

      Gordon
      Pragmatic Praxis

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