Messages in this thread | | | Date | Wed, 2 Dec 1998 05:21:45 +0100 (CET) | From | Rik van Riel <> | Subject | Re: IDE-DMA strangeness (another one) |
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On Tue, 1 Dec 1998, Alex Buell wrote: > On Tue, 1 Dec 1998, Rik van Riel wrote: > > > 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.
All IDE devices in my box are DMA2 capable.
> 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!)
I'm working with an (apparently buggy) PIIX mobo. It's certainly fast enough not to be saturated by the HDs or the CD.
cheers,
Rik -- now completely used to dvorak kbd layout... +-------------------------------------------------------------------+ | Linux memory management tour guide. H.H.vanRiel@phys.uu.nl | | Scouting Vries cubscout leader. http://www.phys.uu.nl/~riel/ | +-------------------------------------------------------------------+
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