Unable to enable DMA on SATA (SCSI emulation) [was Re: Jerky I/O scheduling]

[Matt Zimmerman]

On Wed, Oct 13, 2004 at 10:16:38PM +0300, Ville Vainio wrote:
> On Wed, 2004-10-13 at 11:15 -0700, Matt Zimmerman wrote:
> 
> > It sounds like DMA is not enabled on your hard drive; some web searches will
> > find you more information on this subject.
> 
> Ok, I did some web searches (google + bugzilla). The problem seems to be
> that Ubuntu shows the SATA drives as /dev/sda and /dev/sdb (so I assume
> some SATA emulation is in place?). When I try to enable DMA by "hdparm
> -X66 -d1 /dev/sda"

Ah, you did not mention that these were SATA disks.  File a bug with the
output from:

lspci
dmesg

-- 
 - mdz