VPC at 100% CPU usage after COM port parity errors - even after offendingguest app closes

Discussion in 'Virtual PC' started by Admin, Apr 8, 2005.

  1. Admin

    Admin Guest

    I am testing Virtual PC to see if it may simplify disaster
    recovery for developers. Our applications require the use of the
    serial & parallel ports. XP Pro host and 2000 Pro guest, COM &
    LPT ports hardware mapped into guest.

    The problem when we are running on the Guest:
    If we get a burst of parity errors on the COM port, both the
    guest and host grind to slow motion. Host Task Manager shows
    VirtualPC.exe process pegged at 100% utilization - even after I get
    the application within the Guest to close the COM port (that takes
    over a minute to respond to a mouse click). Even
    exiting the application still has VirtualPC.exe consuming 100%
    on the Host(closing the application takes 3+ minutes). On the
    Guest, System Idle process is getting the
    lion's share of the %, but mouse is VERY sluggish at best. It stops
    regularly for 10-15 seconds at a time. As long as VirtualPC.exe
    continues to run on the Host - this continues. I once requested
    Guest to save state and stop, then exited VirtualPC.exe on the
    host. Took over 15 minutes. Once VirtualPC.exe exits (or I kill
    it with host Task Manager) the mouse comes back to life.
    I am not sure what I may be doing wrong or is this a VPC problem?

    Admin, Apr 8, 2005
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