How hard would it be to just force a shared spinlock between two sata
channels on the same "controller"? It sounds like Jonas has a very
repeatable setup, so even if I can't repeat my problem, if the performance
degradation on writes is related, he can check his thing..
Kinda like the "ide0=serialize" flag for the IDE subsystem, I suppose.
We certainly don't want it to be the default, as millions of ata_piix
systems already out there seem to be working just fine (not all of them
running Linux, but enough of them to extrapolate to the zillions of
identical models).
It must be something new with ICH8 that we're not doing correctly yet.
???
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