Call for testers: Apple ATA DMA

[Marcel Moolenaar]

On Sep 27, 2008, at 11:33 AM, Nathan Whitehorn wrote:

> Peter Grehan wrote:
>> Hi Nathan,
>> > If I can get positive reports from a few more people who were
>>> having trouble, I'll drop this in the tree.
>> The imac's ata-4 is working solidly at UDMA-66. The difference in  
>> CPU usage and i/o with dd at 32k block size is stunning: 2MB/7%  
>> idle before, 18MB/75% idle with your patch.
>
> I guess DMA is a useful technology :)
>
> Thanks for testing -- I've committed the patch. I'll revisit it when  
> Marcel tests it on Monday and it erases his hard drive...

Good and bad news.

The good: my Xserve is working fine and acd0 is now using UDMA33
instead of BIOSPIO.

The bad: my Mac Mini G4 is still having the same problems. This
is ad0 at UDMA66 and acd0 at UDMA33. I'll experiment with it a
bit later...

-- 
Marcel Moolenaar
xcllnt at mac.com