> With this move I saw in improvement (hdparm -t) from 3
> to 8.4 (!) MB/second... Now I wonder what kind of bug
> in the Linux I/O subsystem could hold performance back
> _that_ badly.
Makes a lot of sense if your old IDE disk was PIO only and the newer IDE
uses DMA.
My machine exhibited the same speedup when I swapped around my old PIO IDE
and my spankin' new UMDA IDE hard disks. (It's stuck in DMA though as
PIIX3 chipset doesn't support UDMA - guess I'll have to buy a Promise
UDMA33 controller someday!)
hdparm -t reports 9.6MB/s throughput for /dev/hda although hdparm -T
reports 33MB/s throughput, I don't quite believe that one though. :o)
Cheers,
Alex.
--- /\_/\ Legalise cannabis now! ( o.o ) Grow some cannabis today! > ^ < Peace, Love, Unity and Respect to all.Check out http://www.tahallah.demon.co.uk Linux lo-pc3035a 2.1.130 #10 Mon Nov 30 10:49:50 EST 1998 One Intel Pentium 166MHz processor, 66.36 total bogomips, 16M RAM System library 5.4.44
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