Re: AMD-Vi IO_PAGE_FAULTs and ata3.00: failed command: READ FPDMA QUEUED errors since Linux 4.0

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On Tue, Jul 28 2015 at  3:23pm -0400,
Andreas Hartmann <andihartmann@xxxxxxxxxx> wrote:

> On 07/28/2015 at 08:58 PM, Mike Snitzer wrote:
> > On Tue, Jul 28 2015 at  2:20pm -0400,
> > Andreas Hartmann <andihartmann@xxxxxxxxxx> wrote:
> > 
> >> On 07/28/2015 at 07:50 PM, Mike Snitzer wrote:
> >> [..]
> >>> Are your SATA devcies using NCQ?
> >>
> >> Yes. It's enabled:
> >>
> >> dmesg| grep -i ncq
> >> ahci 0000:00:11.0: flags: 64bit ncq sntf ilck pm led clo pmp pio slum part
> >> ata2.00: 5860533168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
> >> ata3.00: 5860533168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
> >> ata1.00: 468862128 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
> >>
> >> As the errors already come up on boot (during mount of partitions or
> >> even before the password for the disk has been provided): How can I
> >> disable NCQ during boot of the kernel? Is there a kernel option?
> > 
> > See:
> > https://ata.wiki.kernel.org/index.php/Libata_FAQ#Enabling.2C_disabling_and_checking_NCQ
> > 
> > alternatively, and likely easier, set this on the kernel commandline:
> >  libata.force=noncq
> 
> ata2.00: FORCE: horkage modified (noncq)
> ata2.00: 5860533168 sectors, multi 0: LBA48 NCQ (not used)
> ata3.00: FORCE: horkage modified (noncq)
> ata3.00: 5860533168 sectors, multi 0: LBA48 NCQ (not used)
> ata5.00: FORCE: horkage modified (noncq)
> ata1.00: FORCE: horkage modified (noncq)
> ata1.00: 468862128 sectors, multi 16: LBA48 NCQ (not used)
> 
> 
> Perfectly. Seems to work w/ 3.19.8 and your mentioned patches. But now,
> I'm getting another error, which I didn't see before w/ 3.x-kernels:
> 
> [drm:btc_dpm_set_power_state [radeon]] *ERROR*
> rv770_restrict_performance_levels_before_switch failed
> 
> It seams that your patches do have some unwanted side effects :-).

That is a completely different issue.  drm and radeon is a graphics
issue.
 
> Could you please reexamine your patch "dm crypt: don't allocate
> pages for a partial request" - after applying this patch all the
> problems are coming up here.

More likely than not your hardware isn't very good.

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