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    Effects of turning off MSI-X

    Hardware
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    • S
      stvboyle last edited by

      First, I'm running pfSense 2.0.1, amd64.  The systems have 2 bce interfaces and 2 igb interfaces.  The igb interfaces handle the bulk of the traffic and we use one of the bce interfaces for Carp.  On the bce interfaces that are used for Carp, I see inbound Discards.  I've been looking at this doc:
      http://doc.pfsense.org/index.php/Tuning_and_Troubleshooting_Network_Cards

      One of the suggestions in the doc for bce cards is:
      hw.pci.enable_msix=0

      My question is, what effect does that have exactly?  Does that causes all the NICs to stop using interrupts and start polling?  I'm looking to solve the bce problem without affecting the igb interfaces.

      Thanks!!

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      • jimp
        jimp Rebel Alliance Developer Netgate last edited by

        No, it actually makes the NICs use interrupts instead of using MSI/MSI-X

        Polling is entirely different.

        http://en.wikipedia.org/wiki/Message_Signaled_Interrupts

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        • S
          stvboyle last edited by

          Cool, thanks.  Was not sure if that meant hardware interrupts or no interrupts.

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