On 08/01/2015 at 19:57, Mikulas Patocka wrote:
On Sun, 2 Aug 2015, Andreas Hartmann wrote:
On 08/01/2015 at 04:20 PM Andreas Hartmann wrote:
On 07/28/2015 at 09:29 PM, Mike Snitzer wrote:
[...]
Mikulas was saying to biect what is causing ATA to fail.
Some good news and some bad news. The good news first:
Your patchset
f3396c58fd8442850e759843457d78b6ec3a9589,
cf2f1abfbd0dba701f7f16ef619e4d2485de3366,
7145c241a1bf2841952c3e297c4080b357b3e52d,
94f5e0243c48aa01441c987743dc468e2d6eaca2,
dc2676210c425ee8e5cb1bec5bc84d004ddf4179,
0f5d8e6ee758f7023e4353cca75d785b2d4f6abe,
b3c5fd3052492f1b8d060799d4f18be5a5438add
seems to work fine w/ 3.18.19 !!
Why did I test it with 3.18.x now? Because I suddenly got two ata errors
(ata1 and ata2) with clean 3.19.8 (w/o the AMD-Vi IO_PAGE_FAULTs) during
normal operation. This means: 3.19 must already be broken, too.
Therefore, I applied your patchset to 3.18.x and it seems to work like a
charme - I don't get any AMD-Vi IO_PAGE_FAULTs on boot and no ata errors
(until now).
Next I did: I tried to bisect between 3.18 and 3.19 with your patchset
applied, because w/ this patchset applied, the problem can be seen
easily and directly on boot. Unfortunately, this does work only a few
git bisect rounds until I got stuck because of interferences with your
extra patches applied:
[Resolved the problems written at the last post.]
Bisecting ended here:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34b48db66e08ca1c1bc07cf305d672ac940268dc
block: remove artifical max_hw_sectors cap
Removing this patch on 3.19 and 4.1 make things working again. Didn't
test 4.0, but I think it's the same. No more AMD-Vi IO_PAGE_FAULTS with
that patch reverted.
Please check why this patch triggers AMD-Vi IO_PAGE_FAULTS.
Thanks,
kind regards,
Andreas Hartmann
I would submit this bug to maintainers of AMD-Vi. They understand the
hardware, so they should tell why do large I/O requests result in
IO_PAGE_FAULTs.
You forgot the ata errors ... . They are gone, too. I got these ata
errors on 3.19 w/o your patchset and w/o AMD-Vi IO_PAGES_FAULTs, too.
Regards,
Andreas
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