Hi! > >>> If we do resource rebalance after system is up, do you think there is any > >>> side effect or impact to other subsystem other than PCI (e.g. MTRR)? > >> I don't think so. > >>> I haven't had much thinking on the dynamical resource rebalance. If you > >>> have any idea about this, can you please suggest? > >> Yeah, it's going to be hard :) > >> We've thought about this in the past, and even Microsoft said it was > >> going to happen for Vista, but they realized in the end, like we did a > >> few years previously, that it would require full support of all PCI > >> drivers as well (if you rebalance stuff that is already bound to a > >> driver.) So they dropped it. > >> When would you want to do this kind of rebalancing? Before any PCI > >> driver is bound to any devices? Or afterwards? > > > > I guess if we want the rebalance dynamic, then we should have it full -- > > the rebalance would be functional even after the driver is loaded. > > > > But in most cases, there will be problem when we unload driver from a hard > > disk controller, etc. We can mount root on a ramdisk and do the rebalance > > there, but it's complicated for a real user. > > > > So looks like doing rebalancing before any driver is bound to any device is > > also a nice idea, if user can get a shell to do rebalance before built-in > > PCI driver grabs device. > > That's not going to work, it needs to happen before any PCI device is > bound, which is before init runs. We could run shell from early initrd... And PCI is not required for initrd, right? (Ok, I guess this is in we could do it but is it worth the cost?-category...) -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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
