Andrew Morton wrote:
On Sun, 24 Jun 2007 14:32:22 +0200 Enrico Sardi <enricoss@xxxxxxxxxx> wrote:
[ 61.176000] ata1.00: exception Emask 0x2 SAct 0x2 SErr 0x0 action 0x2
frozen
[ 61.176000] ata1.00: (spurious completions during NCQ issue=0x0
SAct=0x2 FIS=005040a1:00000004)
..
It's not obvious (to me) whether this is a driver bug, a hardware bug,
expected-normal-behaviour or what - those diagnostics (which we get to
see distressingly frequently) are pretty obscure.
The spurious completions during NCQ error is indicating that the drive
has indicated it's completed NCQ command tags which weren't outstanding.
It's normally a result of a bad NCQ implementation on the drive.
Technically we can live with it, but it's rather dangerous (if it
indicates completions for non-outstanding commands, how do we know it
doesn't indicate completions for actually outstanding commands that
aren't actually completed yet..)
--
Robert Hancock Saskatoon, SK, Canada
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Home Page: http://www.roberthancock.com/
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