[mythtv-users] Re: DMA not enabled

Kirk Bocek t004 at kbocek.com
Thu Oct 13 17:13:54 UTC 2005

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.


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
>>  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.
> 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

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