[CentOS] DMA disabled on SATA disk with Core Duo/i955 machine (Inspiron 6400)

[first last]

--- William Warren <hescominsoon at emmanuelcomputerconsulting.com> wrote:

> I hve a PE sc430 running sata drives.  transfer rates are jsut fine
> and 
> it show no DMA either.  I think the DMA transfers run just fine in
> sata 
> and do not need to be enabled by default.  Also some disk tools in
> linux 
> have not caught up to the sata revolution yet.  If your tests show
> low 
> transfers then you have an issue.  I have the type of transfers
> during 
> tests i expect so i think the tools are erroneously reporting dms off
> 
> because they don't understand sata drives yet.
> 

I get terrible data transfers and lots of errors while writing to the
disk.

Well, it seems that I will have to wait until CentOS 5 beta :)

Thanks

Gabriel

> first last wrote:
> > --- James Pearson <james-p at moving-picture.com> wrote:
> > 
> >> On 23/10/06, first last <prelude_2_murder at yahoo.co.uk> wrote:
> >>> I am trying to use CentOS 4 on this machine and it does not allow
> >> me to
> >>> set DMA to 1, it just says that it is not possible. I have tried
> >>> updating to the latest release and it still won't work.
> >>>
> >>> I have searched for it on Google and there is a thread mentioning
> >> the
> >>> same machine and CentOS, but none of the solutions (-p, -X 12)
> seem
> >> to
> >>> work at all and there is no "it works!!!!!" message.
> >>>
> >>> Is there anyway I can get DMA working or will I have to wait for
> >> CentOS
> >>> 5? Will any of the "unsupported" kernels work? (I would try
> >> Ubuntu's
> >>> kernel on CentOS, as I am successfuly using that distribution,
> but
> >> it
> >>> is a bit stupid not to use SELinux and it probably wouldn't work
> >>> either).
> >> I don't think you can use hdparm on SATA disks?
> >>
> >> I know some BIOS's allow SATA disks to look like IDE 'legacy'
> drives
> >> (/dev/hdX) - if this is the case, then the OS may be using the
> >> generic
> >> IDE driver and it might not support DMA.
> >>
> >> If this is what you are seeing, then you might want to turn off
> the
> >> legacy or compatible mode in the BIOS and use the drives via
> /dev/sdX
> >> ...
> > 
> > I think this is the case, but there's no way to change the settings
> in
> > the BIOS (that's dell for you). Any way to force the system to use
> SATA
> > instead of P-ATA?
> > 
> > Thanks
> > 
> > Gabriel
> > 
> >> James Pearson
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> >>
> > 
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