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SubjectRe: reason for VIA performance drop since 2.4.2-ac21
> It has nothing to do with mtrr or K6.  In file arch/i386/kernel/pci-pc.c there
> is a pci_fixup_via691_2 function. It appeared in 2.4.2-ac21. And it works for
> my chipset - VIA_82C598. When I put "return" in body of this function,
> recompile and start kernel 2.4.4 - "x11perf -putimage100" shows that video
> works fast again.

My log says that this was a change pulled in from Linus tree. I don't know who
put it there or why

> 1) this is just a debug code, and kernels >2.4.2-ac20 shouldn't be used by VIA
> MVP3 owners
> 2) this code fix crash possibility, and all kernels without it (including
> 2.2.19) are buggy with VIA MVP3

Im not aware of any write posting bugs on the MVP3 but I dont follow the
chipset in detail.

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