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xen-devel
Re: [Xen-devel] pv-ops domU not working with MSI interrupts on Nehalem
> >> You can't use SG buffers? And chain them together and provide them
> >> to the device? A lot of other drivers do this ...
> >
> > Perhaps. I don't know. I'm not the driver author. I think that it
> > worked using 1 giant buffer before so there was no need to use SG
> > buffers.
>
> Got some more info. It's a hardware requirement for the tachyon chip.
> It uses a 2 MB block for the FC SEST index table. It's one place where
> we can't use SG.
OK, pci_alloc_consistent is the way. I think you can go up to 2MB with it.
> It really not a matter of laziness.
<nods>
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