On Sat, 24 Mar 2007, Alan Cox wrote:
On Sat, 24 Mar 2007 12:38:02 -0400 (EDT)
Justin Piszcz <[EMAIL PROTECTED]> wrote:
Without NCQ, performance is MUCH better on almost every operation, with
the exception of 2-3 items.
It depends on the drive. Generally NCQ is better but some drive firmware
isn't too bright and there are probably still cases where we get bad
interactions in the kernel code that want tuning too
Checking the benchmarks on various hardware websites, anandtech,
hothardware and others, they generally all come to the same conclusion if
there is only 1 thread using I/O (single user system) then NCQ off is the
best. I see 30-50MB/s faster speeds with NCQ turned off on two different
SW RAID5s.
Justin.
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