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SubjectPIIX4 IDE tunning Bug (2.3.42)
Enableing tuning of PIIX4 controller resulted in not being able to use dma
and some timouts as listed below after diabling this in the kernel and a
recompile all was well.

Feb 2 20:51:35 debian kernel: hda: timeout waiting for DMA
Feb 2 20:51:35 debian kernel: hda: irq timeout: status=0x58 { DriveReady
SeekCo
mplete DataRequest }
Feb 2 20:51:35 debian kernel: hda: timeout waiting for DMA
Feb 2 20:51:35 debian kernel: hda: irq timeout: status=0x58 { DriveReady
SeekCo
mplete DataRequest }

and that continues for a while until the drive is reset and boot up
continues.

I have:

Linux debian 2.3.42 #1 Wed Feb 2 20:57:33 EST 2000 i686 unknown

Bus 0, device 7, function 1:
IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 1).
Master Capable. Latency=64.
I/O at 0xf000 [0xf00f].

/dev/hda is a Maxtor 90648D3
/dev/hdb is Maxtor 90680D4

With out enabling the tunning feature it all works well so far.

/dev/hda:
multcount = 16 (on)
I/O support = 1 (32-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 787/255/63, sectors = 12656448, start = 0

/dev/hdb:
multcount = 16 (on)
I/O support = 1 (32-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 826/255/63, sectors = 13281408, start = 0


root@debian:~# hdparm -t /dev/hda

/dev/hda:
Timing buffered disk reads: 64 MB in 4.33 seconds = 14.78 MB/sec

root@debian:~# hdparm -t /dev/hdb

/dev/hdb:
Timing buffered disk reads: 64 MB in 5.24 seconds = 12.21 MB/sec


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