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Hublink utilization information, possible to get?

Discussion in 'Intel' started by David Schwartz, Nov 29, 2004.

  1. I have a couple of systems with Intel Canterwood chipsets. I'm concerned
    about the bandwidth between the northbridge and the southbridge and was
    looking for some way to estimate how much of that bandwidth the system was
    using. I've looked at the documentation for the 6300ESB and the 82875P and
    couldn't find anything in the PCI configuration registers.

    All I would need are two 64-bit counters. If there was one counter that
    kept track of the number of Hublink cycles and another that kept track of
    the number of used (or idle) cycles, I could easily tell how close I was to
    saturating that bus. However, if there is such a thing, I couldn't find it.

    Does anyone know if it's possible to determine the utilization of the
    hublink bus? Maybe there's some generic mechanism that all PCI-like busses
    have? (That would make sense, but lots of things that make sense aren't so.)
    The systems are running FreeBSD-5.3.

    David Schwartz, Nov 29, 2004
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  2. David Schwartz

    daytripper Guest

    Hublink is utterly dissimilar to PCI - Express or Vanilla.

    As for documentation, it is remotely possible to obtain the red books for
    Hublink, but I guarantee you the effort will be huge...

    daytripper, Nov 29, 2004
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  3. Hublink is utterly dissimilar to PCI - Express or Vanilla.
    Yes and no. It's utterly dissimilar electrically, but the chipset
    makes it look like a PCI bridge. The same, more or less, happens for
    AGP, CSA, and several other internal chipset linkages. In general, if
    a PCI-PCI bridge can do it, the host-AGP bridge or the host-hublink
    bridge can as well, or at least, it makes it look like it does.

    If there was a generic PCI way to get utilization, odds are it would
    work for CSA, Hublink, AGP, and the like. This is kind of the same way
    all the PATA stuff also works for PATA.

    David Schwartz, Nov 30, 2004
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