Lubomír Bulej wrote:
Hello,
after putting a 250G OCZ CORE v2 SSD into my notebook, I have to endure
several invocations of the ata EH before the kernel decides to disable
NCQ due too many errors. The drive reports NCQ of depth 1, which is
probably useless anyway.
The patchlet below saves me the waiting for the completion of several
ata EH invocations, but I'm not sure if this is the right solution.
Attached are two dmesg dumps, one with errors and the other with the
patchlet compiled in. Attached is also "hdparm -I" of the drive.
I suspect it's all we can really do. NCQ depth of 1 isn't entirely
useless, as using NCQ commands still allows the drive to send/request
data for an individual request out of order, which NCQ commands don't
allow. However, in this case it would appear that the device is sending
back a bogus all-zeros FIS to the controller which triggers error handling.
The "applying bridge limits" part is interesting, that would imply the
device's identify data doesn't properly indicate it's actually a SATA
device so the kernel assumes it's a PATA device behind a SATA bridge. I
don't think it's related to the problem but it does suggest that whoever
designed the SATA interface on that thing probably didn't do a ton of
validation on it..
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