Robert Hancock wrote:
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?
Deleting the ata_pci_clear_simplex() call, then adding
ATA_FLAG_IGN_SIMPLEX to the ata_port_info info[] array, is also worth
trying.
Jeff
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