Brian Macy
-----Original Message-----
From: Nate Thompson <nate@thebog.ml.org>
To: Mark Lord <mlord@pobox.com>
Cc: linux-kernel@vger.rutgers.edu <linux-kernel@vger.rutgers.edu>
Date: Thursday, November 26, 1998 4:50 AM
Subject: Re: 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.
>Latency=64.
> I/O at 0xf000.
>
>Here is the output from hdparm -tT /dev/hda:
>
> /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.
>
>Nate
>
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