Re: pci_set_mwi() ... why isn't it used more?

[Ivan Kokshaysky]

On Thu, Jan 30, 2003 at 08:25:07AM -0800, David Brownell wrote:
> At least on 2.5.59, the pci_generic_prep_mwi() code doesn't check
> for that type of error:  it just writes the cacheline size, and
> doesn't verify that setting it worked as expected.  Checking for
> that kind of problem would make it safer to call pci_set_mwi() in
> such cases ... e.g. using it on a P4 with 128 byte L1 cachelines
> would fail cleanly, while on an Athlon (64 byte L1) it might work
> (depending in which top bits are unusable).

Hmm, what happens if you boot the kernel configured for 80386
on P4 and enable MWI?

Ivan.