..
I though that NCQ was intended to increase performance ??
..
My Raptor drive WDC WD740ADFD-00 Rev: 20.0 performs worse with NCQ
than with NCQ, Alan Cox has added it to a blacklist but I dont think
that is in the mainline kernel yet.
Search the list archives for my previous postings about it, including
some hdparm -tT results.
Andy
Raptors have "server style" firmware in them.
When NCQ is turned on, they self-optimize for random seeks
rather than for sequential read-ahead.
My hdparm test is a sequential read-ahead test, so it will
naturally perform worse on a Raptor when NCQ is on.
That doesn't mean NCQ is bad on all Raptors; it just means
it's not good for large sequential reads.
Cheers
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