Re: Flushing writes to PCI devices

[Roland Dreier]

    Bryan> Yes.  If your device requires that writes to some locations
    Bryan> in MMIO space be performed in a specific order, you must
    Bryan> explicitly do this in your driver.  Intel CPUs will flush
    Bryan> posted writes out of order, for example.

Really?  Just normal posted PCI writes without using MTRRs or
write-combining or anything like that?

That doesn't seem right to me, and I would expect all sorts of things
to break if it were true.

 - R.
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