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Parallel Port Speed Using PCI Passthrough

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Hello,

 

I've recently virtualized a machine used for CNC milling.  It drove the end equipment using a parallel port.  I have installed a PCI parallel port card in the host, and configured ESXi (6.0) to pass it through to the guest.  When I run the mill, it works, but only at a fraction (1/5 as it turns out) of the speed it should.  When I run a parallel port driver test it shows that the CNC software (mach3) can only pulse the parallel port 5k/sec, and it requires at least 25k pulses/sec. 

 

I have verified the 5k/sec pulse limit using three different PCI cards, so it seems clear that this is an issue/bottleneck with ESXi.  So, my questions are:

 

  1) What exactly is this 5k limit?  Is it a polling interval?  Interrupt timer?

  2) Is there a way to configure the host or guest to increase the parallel port speed?

 

Thanks for your help.


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