[mythtv-users] Re: DMA not enabled

[Steve Adeff]

On Thursday 13 October 2005 23:53, Phil Strong wrote:
> Yeah I'll have to check but it may be 2.6.13.2 <http://2.6.13.2> if that is
> the newest. Yes perhaps my Mobo is emulating as an ide because it shows in
> the bios as ide channel 2. Has turned off the bios feature before? I am not
> sure which it will be but what files will I need to configure? grub.conf
> and fstab? Can I do this before I disable so when I reboot it is happy?
> That way I can just keep an older kernel if in fact it doesn't work and
> boot that and restore the correct files until I can figure a work around.
>
> -Phil
>
> On 10/13/05, Steve Adeff <adeffs at gmail.com> wrote:
> > On Thursday 13 October 2005 13:58, Kirk Bocek wrote:
> > > I ran this on kernel 2.6.13.2 <http://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
> > > > 2.6.13kernel 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
> >
> > quite strange, don't know what to say, so I'll bow out of this thread...
> >
> > --
> > Steve

the bios will show it as IDE, its just the linux drivers that treat it as 
SCSI.

Steve