Am Mittwoch 11 Juli 2007 10:01 schrieb Alexander Skwar:
> Hello.
>
> Yesterday, I installed gentoo-sources-2.6.22. When I now boot this new
> kernel, I notice that all of a sudden my SATA disk is addressed with
> /dev/hda, whereas it used to be addressed with /dev/sda in 2.6.21. Why's
> that?
>
> But much more important: The IDE performance is now extremely bad.
>
> ,----[ hdparm  -tT  /dev/hda, kernel 2.6.22 ]
>
> | /dev/hda:
> |  Timing cached reads:   2414 MB in  2.00 seconds = 1208.28 MB/sec
> |  Timing buffered disk reads:    8 MB in  3.99 seconds =   2.00 MB/sec
>
> `----
>
> With 2.6.21, it's A LOT faster:
>
> ,----[ hdparm -tT /dev/sda, kernel 2.6.21 ]
>
> | /dev/sda:
> |  Timing cached reads:   2414 MB in  2.00 seconds = 1207.80 MB/sec
> |  Timing buffered disk reads:  150 MB in  3.01 seconds =  49.76 MB/sec
>
> `----
>
> The drive is (is?) running with udma5 in both cases, according to
> hdparm:
>
> ,----[ hdparm -Him  /dev/sda, kernel 2.6.21 ]
>
> | /dev/sda:
> |  drive temperature (celsius) is:  42
> |  drive temperature in range:  yes
> |  HDIO_GET_MULTCOUNT failed: Inappropriate ioctl for device
> |
> |  Model=Hitachi HTS721010G9SA00                 , FwRev=MCZOC10H,
> | SerialNo=      MPCZN7Y0H7E5VL Config={ HardSect NotMFM HdSw>15uSec Fixed
> | DTR>10Mbs }
> |  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
> |  BuffType=DualPortCache, BuffSize=7538kB, MaxMultSect=16, MultSect=?8?
> |  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=195371568
> |  IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
> |  PIO modes:  pio0 pio1 pio2 pio3 pio4
> |  DMA modes:  mdma0 mdma1 mdma2
> |  UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
> |  AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
> |  Drive conforms to: ATA/ATAPI-7 T13 1532D revision 1: 
> | ATA/ATAPI-2,3,4,5,6,7
> |
> |  * signifies the current active mode
>
> `----
>
> ,----[ hdparm -Him  /dev/hda, kernel 2.6.22 ]
>
> | /dev/hda:
> |  drive temperature (celsius) is:  41
> |  drive temperature in range:  yes
> |  multcount     = 16 (on)
> |
> |  Model=Hitachi HTS721010G9SA00, FwRev=MCZOC10H, SerialNo=MPCZN7Y0H7E5VL
> |  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> |  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
> |  BuffType=DualPortCache, BuffSize=7538kB, MaxMultSect=16, MultSect=16
> |  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=195371568
> |  IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
> |  PIO modes:  pio0 pio1 pio2 pio3 pio4
> |  DMA modes:  mdma0 mdma1 mdma2
> |  UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
> |  AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
> |  Drive conforms to: ATA/ATAPI-7 T13 1532D revision 1: 
> | ATA/ATAPI-2,3,4,5,6,7
> |
> |  * signifies the current active mode
>
> `----
>
> What do I have to do, so that the drive is fast in kernel 2.6.22 as
> well?
>
> I'm booting the 2.6.22 kernel with this entry in grub menu.lst:
>
> ,----[ kernel 2.6.22 ]
>
> | title Gentoo GNU/Linux (zuletzt gebauter Kernel mit hda)
> |         root (hd0,2)
> |         kernel /vmlinuz root=/dev/hda6 lapic libata.atapi_enabled=1
> | combined_mode=libata
>
> `----
>
> Kernel 2.6.21 is started with the following entry in grub:
>
> ,----[ kernel 2.6.21 ]
>
> | title Gentoo GNU/Linux (vorletzter gebauter Kernel)
> |         root (hd0,2)
> |         kernel /vmlinuz.old root=/dev/sda6 lapic libata.atapi_enabled=1
> | combined_mode=libata
>
> `----

I had the same problem on my laptop. You have to deactivate generic drivers in 
your kernel. (Stuff like Generic ATA Support)