Re: IDE-DMA strangeness (another one)

Mark Gray (
01 Dec 1998 15:32:10 -0500

Rik van Riel <> writes:

> Hi,
> I've just moved my IDE disks around, taking out an old
> disk and moving my new 6.4GB disk from hdd to hda.
> 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.
> Of course both benchmarks were done on a completely
> unloaded IDE chip/PCI bus...

Some motherboards use a crippled controller for ide1 in the belief
that it will only be used for cdroms.

> cheers,
> Rik -- now completely used to dvorak kbd layout...

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