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SubjectRe: Absolutely horrid IDE performance...
Mark Lord wrote:

> The PIIX4 chip supports UDMA, but not the PIIX or PIIX3
> (there are multiple versions of Intel "PIIX" chips,
> and the first version, i82371FB, is called the "PIIX").

Well, I understand that is the case, however, the reporting on boot is
just incorrect (I think). I just spent a bit of this evening taking a
look at all of this on my machine.

Here are the boot messages:

ide: i82371 PIIX (Triton) on PCI bus 0 function 57
ide0: BM-DMA at 0xf000-0xf007
ide1: BM-DMA at 0xf008-0xf00f
hda: Maxtor 87000D8, 6679MB w/256kB Cache, CHS=851/255/63, UDMA
hdb: BCD-24X 1997-06-27, ATAPI CDROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14

And here is what is in /proc/pci:

Bus 0, device 7, function 1:
IDE interface: Intel 82371AB PIIX4 IDE (rev 1).
Medium devsel. Fast back-to-back capable. Master Capable.
I/O at 0xf000.

Here is the output from hdparm -tT /dev/hda:

Timing buffer-cache reads: 128 MB in 1.64 seconds = 78.05 MB/sec
Timing buffered disk reads: 64 MB in 7.11 seconds = 9.00 MB/sec

So it appears I have a PIIX4, which is not being correctly reported
during bootup.


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