Jeff Spaleta wrote:
Is there some reasonably valid understanding of how big an impact this
makes in the average and worst case? Sort of a measure of the spread
of disk-drive performance out in the wild.
Say for example...a typical christmas special home desktop from
Dell... does the disk-seek performance on a system like that make an
order of magnitude faster bootup or application startup times a
pipedream?
My back-of-the-envelope number is 3x better performance in Ultra 320
drives vs PATA for seek-heavy workloads (database apps, make -j4, cp a
50 GB directory.) A big part of the advantage comes from tagged command
queueing -- recent SATA drives support Native Command Queueing (NCQ) but
benchmarks I've seen of NCQ drives aren't impressive.
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