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Ken_Nadsady_517's avatar
Ken_Nadsady_517
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Dec 11, 2009

Delayed Ack Timer Question

Does anyone know what the value of the delayed ack timer is in local Traffic Manager? Is it 100mec, 200msec?

 

 

Also, is it a global timer like most systems? i am seeing consistent 100msec delays before Big-IP ACKs in a particular transaction and it looks like it is being caused by delayed ACK, which is enabled.

 

 

What puzzles me is the consistency of the delay, it appears to be 100msec every time, as if the timer is specific to this particular transaction, rather than a running global timer.
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  • L4L7_53191's avatar
    L4L7_53191
    Icon for Nimbostratus rankNimbostratus
    Dec 14, 2009
    Delayed ACK is a per-virtual server setting, not global. While I don't know the default delay on BigIP, I believe the standard range is 100-200ms although I'm no authority here...

     

     

    At any rate 100ms seems normal, and I'd expect the timer to be virtual server (or even transaction) specific.

     

     

    HTH,

     

    -Matt
  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Dec 15, 2009
    as Matt indicated, typically 100ms, but should never exceed 500ms. I wrote an article on the acknowledgements a while back if you're interested: Click here