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?
You can't be sure of that - compile your ATA driver =y and you'll
definitely end up using PCI.
Alex
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