On Mon, 15 Jun 2009 00:40:23 +0200
Andrea Bravetti <andreabravetti@xxxxxxxxx> wrote:
> Please add "WDC WD3200BEVT-22ZCT0" to the NCQ blacklist.
>
> I had some performance problem and I added this line:
>
> { "WDC WD3200BEVT-22ZCT0", NULL, ATA_HORKAGE_NONCQ },
Following some off list discussion - NAK this.
There is something going on clearly but it doesn't appear to be the drive
but rather that the I/O patterns with NCQ (maybe the better performance)
are messing something else up.
Needs further exploration to see if this is vm, I/O scheduling or our
current libata lack of protection against drive firmware unfairness (as
the SCSI layer has)
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