How to measure slow-down

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  • #8156
    iceback
    Participant

    I connect my macbook pro to work machines (at university) using Cisco AnyConnect vpn. The response time within the NX session is quite bad: a second or two delay consistently with typing; page redraws are in visible steps.  Direct ssh sessions to the same machines within same vpn session are without noticeable delays in typing or output.

    While on-site, nx from my laptop to these same machines is perfect.

    How do I go about assessing which part of the pipe is getting squeezed? As it is working from home is painful, certainly can’t stand if for long.

    Cisco AnyConnect 3.1.05182

    NX Server version 4.6.12 with player 4.4.1

    #8180
    Britgirl
    Keymaster

    Could be a bandwidth problem. Try lowering the quality https://www.nomachine.com/DT10K00060&dn=#5.6 by moving the slider to the left.

    Have you tried transferring a file, for example through SCP (outside the session)? This would show you whether bandwidth is enough i.e during the transfer of a chunky file you will be able to see what bytes/second are being sent.

    #8224
    iceback
    Participant

    scp file transfer rates are adequate but I’ll put some numbers to that claim.  I have a believable 25MB/sec connect at home and the U’s pipe it , um er, rather large, but something is choking.  We’ll see what stats I can get from local network folks.

    #8266
    iceback
    Participant

    Is there any input buffering?  As in ‘wait-this-long’ for more keyboard input before sending to server? And if so is it configurable?

    #8306
    Britgirl
    Keymaster

    No. Input buffering is not configurable. Events are transmitted as soon as it’s possible.

    #8324
    fra81
    Moderator

    Hi iceback,

    don’t forget that what you have in upload also matters. I would check the real bandwidth on both directions. Most important is the direction where graphical output flows.

    #8363
    iceback
    Participant

    Well yes, the graphics come from the nx-server end of course.  From my end it’s all keyboard and mouse.  Still suspect a client side delay/buffering as part of the problem.

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