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

[Jeff Garzik]

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


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/