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SubjectWhy is NCQ enabled by default by libata? (2.6.20)
Without NCQ, performance is MUCH better on almost every operation, with 
the exception of 2-3 items.

/usr/sbin/bonnie++ -d /x/bonnie -s 7952 -m p34 -n 16:100000:16:64 > run.txt;

# Average of 3 runs with NCQ on for Quad Raptor ADFD 150 RAID 5 Software RAID:
# Average of 3 runs with NCQ off for Quad Raptor ADFD 150 RAID 5 Software RAID:

In general, for networking, etc, the kernel chooses 'optimized' defaults,
therefore, I was curious why is NCQ enabled by default?

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