Messages in this thread | | | Date | Thu, 26 Nov 1998 11:17:23 +0100 (CET) | From | Rik van Riel <> | Subject | Re: Absolutely horrid IDE performance... |
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On Wed, 25 Nov 1998, Nate Thompson wrote: > Mark Lord Said: > > Ooops.. wait a minute.. you said: > > > > >ide: i82371 PIIX (Triton) on PCI bus 0 function 57 > > > > The Intel PIIX chip does not support UDMA. > > Ummm..... What? Yes it does. Either that or I have been horribly > lied to by everything I've seen elsewhere?!?!?!
My board doesn't support UDMA (AFAIK) because it predates the UDMA standard by quite a while:
Bus 0, device 7, function 1: IDE interface: Intel 82371FB PIIX IDE (rev 2). Medium devsel. Fast back-to-back capable. Master Capable. Latency=32. I/O at 0x3000 [0x3001].
If you happen to have a higher revision (3, 4?) your board might support UDMA though... I have heard some rumours about revision 4 supporting UDMA and lower revisions not, but my memory regarding this is too foggy to know for sure :)
I can use PIO mode 4 and DMA mode 2 though... Fast enough for my needs since my high-performance files are on SCSI anyway.
Btw, I discovered just today that my 1995 Quantum Trailblazer can run at 2.96 MB/s. I've been running it in standard mode (-c1 -d1) for years with worse performance. It even is faster than the 6.4GB Maxtor I bought (cheaply) last friday :) My 1989 Maxtor SCSI disk gets half the performance while my WD Enterprise delivers 5 to 6.5 MB/s to my system.
I guess this makes a pretty decent I/O subsystem for a P100 with 72 megs of RAM...
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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