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DateWed, 15 Mar 2006 17:25:44 -0500
FromJeff Garzik <>
SubjectRe: libata/sata_nv latency on NVIDIA CK804 [was Re: AMD64 X2 lost ticks on PM timer]
Ingo Molnar wrote:
> so my guess would be that this device doesnt do MMIO, and the PIO inb() 
> causes some bad BIOS-based SMM handler/emulator to trigger, which takes 
> 16.6 msecs. If indeed the device is not in MMIO mode, is there a way to 
> force it into MMIO mode, to test this theory?

Yes, but that carries with it an entirely new programming set, to use 
MMIO: http://marc.theaimsgroup.com/?l=linux-ide&m=114124501116060&w=2

Not like NICs, where you can just point it at another PCI BAR.

	Jeff


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