Fedora Core 6 Test Update: kernel-2.6.22.1-15.fc6

[Chuck Ebbert]

On 07/19/2007 07:52 AM, James Hubbard wrote:
> On 7/18/07, Dave Jones <davej at redhat.com> wrote:
>>
>> On Mon, Jul 16, 2007 at 07:41:23PM -0400, James Hubbard wrote:
>>
>> > Dell M65 laptop with no devices connected.
>> >
>> > Using  2.6.20-1.2962, my hard drive shows up as sda with buffered disk
>> > read of ~49MB/sec.  Under  the .22 kernel it shows up as hda and the
>> > buffered read is < 2MB/sec.   (This cause the boot to be very slow.)
>>
>> This is really odd.
>> I have the same laptop, and it consistently pulls 33MB/s under F7's .22
>> kernel, and from memory, it was the same result under F6's .20
>>
>> I don't recall it ever getting near the speeds you mention.
>> Under F7 it's using ata_piix.  What driver is yours using,
>> and can you paste the output of hdparm -i for that device ?
>>
> 
> I have the 7200 RPM drive, if I'm not mistaken.  Bios version A07.
> 
> 2.6.20 :
> hdparm -i /dev/sda
> /dev/sda:
> HDIO_GET_IDENTITY failed: Inappropriate ioctl for device
> 
> 22:
> hdparm -i /dev/hda
> /dev/hda:

This is really strange. In the FC6 2.6.20 kernels, the IDE driver does
not claim the drive; later on ata_piix gets control:

 Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
 ide0: I/O resource 0x1F0-0x1F7 not free.
 ide0: ports already in use, skipping probe

In 2.6.22, IDE does:

 Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
 Probing IDE interface ide0...
 Clocksource tsc unstable (delta = -101028827 ns)
 hda: Hitachi HTS721010G9SA00, ATA DISK drive

So what changed? The configuration looks the same, with IDE built in
and the ata driver as a module.