[mythtv-users] Re: DMA not enabled
Steve Adeff
adeffs at gmail.com
Thu Oct 13 17:35:12 UTC 2005
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
More information about the mythtv-users
mailing list