Gentoopower wrote:
Raz Ben-Jehuda(caro) wrote:
i am thinking of buying a promise card sataII pcix.
they have two types, a card which support NCQ
and another that does not.
What is the bennifit of buying a card with NCQ tagging ?
How about: http://en.wikipedia.org/wiki/Native_command_queueing
Yuck.. what a lousy wiki entry.
NCQ vs. TCQ: NCQ has a much more efficient low-level protocol,
making the host-side (controller, operating-system) quite a bit
simpler than with NCQ.
Both use 32-deep queue depths, and neither of them are worth a
damn on Linux yet. Except possibly in the libata ahci driver,
or vendor-provided drivers (open source, even) for some chipsets.
In theory, NCQ/TCQ can speed up a very busy fileserver that is
handling mostly tiny I/O requests. Practically no measurable
benefit for single-user systems.
Cheers
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