Re: IDE-DMA strangeness (another one)

Kurt Garloff (
Wed, 2 Dec 1998 23:43:34 +0100

On Tue, Dec 01, 1998 at 04:10:08PM -0500, Alex Buell wrote:
> 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)

>From the hdparm manpage:
-T [...]
This displays the speed of reading directly from
the Linux buffer cache without disk access. This
measurement is essentially an indication of the
throughput of the processor, cache, and memory of
the system under test. [...]

So 33MB/s is quite realistic, but in no way characteristic for your HD.

Kurt Garloff <>  (Dortmund, FRG)
PGP key on

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to Please read the FAQ at