* Bjorn Helgaas <bjorn.helgaas@xxxxxx> wrote: > > OK, so I guess the best thing we can do for 2.6.37 is to revert 1af3c2e (x86: > > allocate space within a region top-down), right? > > That's a possibility, but I'm not sure it's the best. It would avoid the nx6325 > landmine, but we could easily step on a different one on other machines. > > If Windows uses the end of available space first, that's the best-tested > territory, and I think it's better to try to stay in it rather revert 1af3c2e and > start mapping different territory that really isn't tested by Windows at all. > > On the nx6325, we stray out of that tested territory because Linux opens windows > on subtractive-decode bridges and allocates more space to CardBus bridges. > > I think it'd be fairly simple to leave subtractive-decode bridges alone, and that > might make the nx6325 work well enough for .37, even without the quirk. This > feels like a change that might be the right thing to do in general. Using > subtractive rather than positive decode would give up a little performance, but I > doubt it's important Is there a patch for that that people could try? The regression needs to be addressed one way or another: either by improving the "compatible with Windows" approach to actually work (without quirks), or by reverting to the tested-for-years Linux solution. ( What we always try to avoid is trading in a set of regressions for another set of regressions. That way lies madness, it can not result in reliable, provable progress. ) Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
