[mythtv-users] Re: DMA not enabled

[Kirk Bocek]

I ran this on kernel 2.6.13.2. So I'm not so sure it's a kernel issue.

Kirk

Steve Adeff wrote:
> On Thursday 13 October 2005 13:13, Kirk Bocek wrote:
> 
>>I've used hdparm -Tt on all sorts of non-IDE devices: flash-memory drives,
>>Raid devices, RAM drives. It's never been a problem.
>>
>>Kirk
>>
>>Steve Adeff wrote:
>>
>>>On Thursday 13 October 2005 12:50, Kirk Bocek wrote:
>>>
>>>>Here's the output on my SATA drive:
>>>>
>>>># hdparm -Tt /dev/sda
>>>>
>>>>/dev/sda:
>>>> Timing cached reads:   3832 MB in  2.00 seconds = 1915.88 MB/sec
>>>>HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
>>>>ioctl for device Timing buffered disk reads:  184 MB in  3.02 seconds = 
>>>>60.84 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed:
>>>>Inappropriate ioctl for device
>>>>
>>>>So it fails on some sort of IO command but still runs the benchmark.
>>>>
>>>>Kirk
>>>
>>>those IO errors are normal as hdparm is designed for IDE while the SATA
>>>drivers treat SATA as a SCSI device.  from your numbers though, DMA is
>>>definitely on.
>>>
>>>Steve
> 
> 
> Well, yes, but the older SATA drivers didn't have a complete command set. I 
> used to get the same error on my SATA drives but with the 2.6.13 kernel i 
> don't. Nothing to worry about though, and as I said, "DMA" is definitely on 
> (not that SATA does the whole DMA thing like PATA does).
> 
> Steve