System unresponsive during HDD activity

[Gilboa Davara]

On Sat, 2010-09-18 at 19:17 -0700, Konstantin Svist wrote:
> On 09/18/2010 03:06 AM, Gilboa Davara wrote:
> > On Sat, 2010-09-18 at 01:36 -0700, Konstantin Svist wrote:
> >> On 09/17/2010 12:41 PM, Gilboa Davara wrote:
> >>> Your SATA seems to be configured to work in IDE compatibility mode.
> >>
> >> You were right, I found a mention of my chipset and a patch
> >> (http://www.codon.org.uk/~mjg59/tmp/ahci_quirk_cleanup.diff)
> >> After compiling the kernel with it, the chipset is now running with ahci
> >> driver. That enabled NCQ and improved some fio benchmarks, but looks
> >> like the lag during svn up is still present.
> >> Still, some improvement is a good thing.
> >>
> > I'd suggest you file a bug report in http://bugzilla.redhat.com and ask
> > that this patch will be included. Make sure you post the complete
> > hardware configuration in the bug report.
> > Looking at the code, I don't see any huge reason that this patch (minus
> > some cleanup) won't find it way into the kernel. (Though, I'd check
> > http://bugzilla.kernel.org and see if its already in-line for inclusion
> > in the up stream kernel.)
> >
> > - Gilboa
> >
> >
> 
> 
> It turns out that if AHCI mode is enabled, my DVD drive disappears. 
> Apparently with normal kernel, it's detected as PATA - and with the 
> patch not detected at all.
> Figures

I expected that.
On my machines, switching to AHCI disables DVD boot, but the DVD remains
accessible.

Add it to the bug report.
In theory, enabling AHCI on port should not effect the other port.
(Unless there's a BIOS issue)

- Gilboa