Re: pata_amd dropping to PIO on resume

From: Robert Hancock
Date: Fri Feb 16 2007 - 18:20:50 EST


Tobias Diedrich wrote:
Possibly a known issue:

After resume pata_amd drops from UDMA/33 to PIO on my system.
Reloading the module puts both attached optical drives (master and
slave) back to UDMA/33.

AFAICS "simplex DMA is claimed by other device, disabling DMA" seems
to be causing it to drop to PIO (but only after a suspend/resume
cycle, not on boot or module load).

Burning a DVD with 6x speed using PIO makes heavy use of burnproof
and makes the whole system quite sluggish. :)

Yes, the fact that it's going into simplex mode is the problem, it wasn't in simplex to start with. It looks like pata_amd does an ata_pci_clear_simplex only for certain chip models, maybe this model needs it as well?

--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@xxxxxxxxxxxxx
Home Page: http://www.roberthancock.com/

-
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/