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Subject2.6.0test3 + Intel 82801AA IDE + 80Gb Barracuda -> NO DMA

I'm having serious trouble dealing with:
* 80Gb Seagate Barracuda disc (Model Number ST380011A, Firmware Revision 3.04)
* on an Intel 82801AA IDE controller
* 2.6.0test3

When booting, it disables DMA. With RH stock kernels it did not even boot.
It's currently running.

If someone can enlighten me on how to boot with DMA enabled maybe I'd
achieve a better performance than this (best result in several tries):
# hdparm -tT /dev/hda
/dev/hda:
Timing buffer-cache reads: 128 MB in 0.79 seconds =162.46 MB/sec
Timing buffered disk reads: 64 MB in 14.33 seconds = 4.46 MB/sec

These are the relevant parametres to me.

------------------------------------------------------------
# hdparm -I /dev/hda

/dev/hda:

ATA device, with non-removable media
Model Number: ST380011A
Serial Number: 3JV07K8W
Firmware Revision: 3.04
Standards:
Used: ATA/ATAPI-6 T13 1410D revision 2
Supported: 6 5 4 3
Configuration:
Logical max current
cylinders 16383 65535
heads 16 1
sectors/track 63 63
--
CHS current addressable sectors: 4128705
LBA user addressable sectors: 156301488
LBA48 user addressable sectors: 156301488
device size with M = 1024*1024: 76319 MBytes
device size with M = 1000*1000: 80026 MBytes (80 GB)
Capabilities:
LBA, IORDY(can be disabled)
bytes avail on r/w long: 4 Queue depth: 1
Standby timer values: spec'd by Standard
R/W multiple sector transfer: Max = 16 Current = 16
Recommended acoustic management value: 128, current value: 0
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 udma5
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=240ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* READ BUFFER cmd
* WRITE BUFFER cmd
* Host Protected Area feature set
* Look-ahead
* Write cache
* Power Management feature set
Security Mode feature set
* SMART feature set
* FLUSH CACHE EXT command
* Mandatory FLUSH CACHE command
* Device Configuration Overlay feature set
* 48-bit Address feature set
SET MAX security extension
* DOWNLOAD MICROCODE cmd
* SMART self-test
* SMART error logging
Security:
supported
not enabled
not locked
not frozen
not expired: security count
not supported: enhanced erase
HW reset results:
CBLID- above Vih
Device num = 0 determined by the jumper
Checksum: correct
------------------------------------------------------------

# lspci
00:00.0 Host bridge: Intel Corp. 82820 820 (Camino) Chipset Host Bridge (MCH) (rev 04)
00:01.0 PCI bridge: Intel Corp. 82820 820 (Camino) Chipset AGP Bridge (rev 04)
00:1e.0 PCI bridge: Intel Corp. 82801AA PCI Bridge (rev 02)
00:1f.0 ISA bridge: Intel Corp. 82801AA ISA Bridge (LPC) (rev 02)
00:1f.1 IDE interface: Intel Corp. 82801AA IDE (rev 02)
00:1f.2 USB Controller: Intel Corp. 82801AA USB (rev 02)
00:1f.3 SMBus: Intel Corp. 82801AA SMBus (rev 02)
00:1f.5 Multimedia audio controller: Intel Corp. 82801AA AC'97 Audio (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation RIVA TNT2 Model 64
(rev 15)02:0c.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M
[Tornado] (rev 78)
------------------------------------------------------------

# lsmod
Module Size Used by
nfsd 164160 8
exportfs 6528 1 nfsd
lockd 65008 2 nfsd
sunrpc 133188 2 nfsd,lockd
iptable_filter 2944 0
ip_tables 18576 1 iptable_filter
autofs 16128 0
3c59x 34600 0

------------------------------------------------------------

# hdparm -i /dev/hda

/dev/hda:

Model=ST380011A, FwRev=3.04, SerialNo=3JV07K8W
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=156301488
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=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-6 T13 1410D revision 2: 1 2 3 4 5 6
------------------------------------------------------------

# cat /proc/ide/hda/settings
name value min max mode
---- ----- --- --- ----
acoustic 0 0 254 rw
address 1 0 2 rw
bios_cyl 16383 0 65535 rw
bios_head 255 0 255 rw
bios_sect 63 0 63 rw
bswap 0 0 1 r
current_speed 68 0 70 rw
failures 0 0 65535 rw
init_speed 68 0 70 rw
io_32bit 3 0 3 rw
keepsettings 0 0 1 rw
lun 0 0 7 rw
max_failures 1 0 65535 rw
multcount 16 0 16 rw
nice1 1 0 1 rw
nowerr 0 0 1 rw
number 0 0 3 rw
pio_mode write-only 0 255 w
slow 0 0 1 rw
unmaskirq 1 0 1 rw
using_dma 0 0 1 rw
wcache 0 0 1 rw

------------------------------------------------------------
And part of the boot messages:
# uname -a
Linux fileserver 2.6.0-test4 #4 Mon Aug 25 16:09:30 CEST 2003 i686 i686 i386 GNU/Linux

ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
ICH: IDE controller at PCI slot 0000:00:1f.1
ICH: chipset revision 2
ICH: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:pio
hda: ST380011A, ATA DISK drive
PM: Adding info for No Bus:ide0
Using anticipatory scheduling elevator
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
PM: Adding info for ide:0.0
hdc: CRD-8482B, ATAPI CD/DVD-ROM drive
PM: Adding info for No Bus:ide1
hdc: Disabling (U)DMA for CRD-8482B
ide1 at 0x170-0x177,0x376 on irq 15
PM: Adding info for ide:1.0
hda: max request size: 1024KiB
hda: 156301488 sectors (80026 MB) w/2048KiB Cache, CHS=16383/255/63,
UDMA(66)
hda:<4>hda: dma_timer_expiry: dma status == 0x21
hda: DMA timeout error
hda: dma timeout error: status=0x58 { DriveReady SeekComplete DataRequest
}

hda1 hda2
hda: dma_timer_expiry: dma status == 0x21
hda: DMA timeout error
hda: dma timeout error: status=0x58 { DriveReady SeekComplete DataRequest
}



Pau


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