hdparm shows poor performance on cached reads for PATA drive
Konstantin Svist
fry.kun at gmail.com
Tue Nov 27 00:12:25 UTC 2007
Hi all,
I have an older laptop (HP ze4400 series) with a PATA hard drive.
When I check hdparm -T /dev/sda in Fedora 7 or 8, it shows me
performance of ~180MB/sec
When I use a boot CD (gparted/clonezilla) to check the speed (by the
way, it uses the old style /dev/hdc, instead) - it tells me the
performance is upward of 400MB/sec
The buffered speed seems about the same in either case at ~30MB/sec.
(I've tried enabling/disabling various settings via hdparm, while in
boot CD mode)
Why is this happening and is there a way to fix it (without reverting to
/dev/hdc)?
Thanks!
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