On Sat, Jul 14, 2001 at 09:45:44AM +0100, Alan Cox wrote:
As far as I can tell none of them at least in the IDE world
Can you test with the code I posted a hour or so ago please?
I ask this because I tested writes to:
-- buffered devices
-- ide with caching on
-- ide with caching off
-- scsi (caching on?)
To a buffered device, I get something silly like 63000
writes/second. No big surprises there (other than Linux is bloody lean
these days).
To a SCSI device (10K RPM SCSI-3 160 drive), I get something like 167
writes/second, which seems moderately sane if caching is disabled.
To a cheap IDE drive (5400 RPM?) with caching off, I get about 87
writes/second.
To the same drive, with caching on, I get almost 4000 writes/second.
This seems to imply, at least for my test IDE drive, you can turn
caching off --- and its about half as fast as my SCSI drives which
rotate at about twice the speed (sanity check).
IDE drive: IBM-DTTA-351010, ATA DISK drive
SCSI drive: SEAGATE ST318404LC
--cw
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This archive was generated by hypermail 2b29 : Sun Jul 15 2001 - 21:00:22 EST