Re: libata/sata_nv latency on NVIDIA CK804 [was Re: AMD64 X2 lost ticks on PM timer]

Jeff Garzik
2006-03-15T22:25:53Z

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