After upgrading to 2.6.24-rc1 I get the message ata6.00: limited to
UDMA/33 due to 40-wire cable. The 2.6.23 kernel does not complain and
activates DMA for the channel.
I'm using an nforce 4 board with the following ata devices:
channel1, master: disk IC35L120AVVA07-0 120gig
channel1, slave: dvd HITACHI DVD-ROM GD-7500
channel2, master: disk IC35L120AVV207-0 120gig
channel2, slave: cdrom LITE-ON LTR-40125S
I've made sure the cable is 80-pin and tried replacing it with a
similar cable. Only channel2 gets UDMA33, channel1 works fine.
The change was introduced in 2.6.24-rc1 but also exists in 2.6.24-rc2.
It probably have something to do with the new function
ata_acpi_cbl_80wire in drivers/ata/libata-acpi.c. I've added a return
1; at the beginning of that function as a quick workaround for the
problem.
The non libata driver prints the waring "BIOS didn't set the cable
bits correctly. Enabling workaround" which is probably related to
this. However I am using the latest bios.
The thread "2.6.24-rc1: pata_acpi fails to activate DMA for DVD-ROM on
ALi M5229 secondary channel" might be related to this.
Another thing that might be related is that I get bad throughput on
the second channel disk even with my workaround but this also occurs
with older kernels and with the non libata driver.
# hdparm -tT /dev/sdb
/dev/sdb:
Timing cached reads: 1346 MB in 2.00 seconds = 673.35 MB/sec
Timing buffered disk reads: 138 MB in 3.04 seconds = 45.40 MB/sec
# hdparm -tT /dev/sdc
/dev/sdc:
Timing cached reads: 1392 MB in 2.00 seconds = 696.02 MB/sec
Timing buffered disk reads: 34 MB in 3.39 seconds = 10.02 MB/sec
# hdparm -I /dev/sdb
/dev/sdb:
ATA device, with non-removable media
powers-up in standby; SET FEATURES subcmd spins-up.
Model Number: IC35L120AVVA07-0
Serial Number: VNC602A6G5LH4A
Firmware Revision: VA6OA52A
Standards:
Used: ATA/ATAPI-5 T13 1321D revision 1
Supported: 5 4 3 & some of 6
Configuration:
Logical max current
cylinders 16383 65535
heads 16 16
sectors/track 63 0
--
CHS current addressable sectors: 0
LBA user addressable sectors: 241254720
device size with M = 1024*1024: 117800 MBytes
device size with M = 1000*1000: 123522 MBytes (123 GB)
Capabilities:
LBA, IORDY(can be disabled)
bytes avail on r/w long: 52 Queue depth: 32
Standby timer values: spec'd by Standard, no device specific minimum
R/W multiple sector transfer: Max = 16 Current = 1
Advanced power management level: unknown setting (0x0000)
Recommended acoustic management value: 128, current value: 254
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:
* SMART feature set
Security Mode feature set
* Power Management feature set
* Write cache
* Look-ahead
Release interrupt
* Host Protected Area feature set
* WRITE_BUFFER command
* READ_BUFFER command
* NOP cmd
* READ/WRITE_DMA_QUEUED
Advanced Power Management feature set
Power-Up In Standby feature set
SET_FEATURES required to spinup after power up
Address Offset Reserved Area Boot
SET_MAX security extension
Automatic Acoustic Management feature set
* Device Configuration Overlay feature set
* Mandatory FLUSH_CACHE
Security:
Master password revision code = 65534
supported
not enabled
not locked
not frozen
not expired: security count
not supported: enhanced erase
72min for SECURITY ERASE UNIT.
HW reset results:
CBLID- above Vih
Device num = 0 determined by the jumper
Checksum: correct
# hdparm -I /dev/sdc
/dev/sdc:
ATA device, with non-removable media
powers-up in standby; SET FEATURES subcmd spins-up.
Model Number: IC35L120AVV207-0
Serial Number: VNVD06G4CGKB5L
Firmware Revision: V24OA66A
Standards:
Used: ATA/ATAPI-6 T13 1410D revision 3a
Supported: 6 5 4
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 241254720
LBA48 user addressable sectors: 241254720
device size with M = 1024*1024: 117800 MBytes
device size with M = 1000*1000: 123522 MBytes (123 GB)
Capabilities:
LBA, IORDY(can be disabled)
Queue depth: 32
Standby timer values: spec'd by Standard, no device specific minimum
R/W multiple sector transfer: Max = 16 Current = 1
Advanced power management level: unknown setting (0x0000)
Recommended acoustic management value: 128, current value: 254
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:
* SMART feature set
Security Mode feature set
* Power Management feature set
* Write cache
* Look-ahead
Release interrupt
* Host Protected Area feature set
* WRITE_BUFFER command
* READ_BUFFER command
* NOP cmd
* READ/WRITE_DMA_QUEUED
Advanced Power Management feature set
Power-Up In Standby feature set
SET_FEATURES required to spinup after power up
Address Offset Reserved Area Boot
SET_MAX security extension
Automatic Acoustic Management feature set
* 48-bit Address feature set
* Device Configuration Overlay feature set
* Mandatory FLUSH_CACHE
* FLUSH_CACHE_EXT
* SMART error logging
* SMART self-test
* General Purpose Logging feature set
Security:
Master password revision code = 65534
supported
not enabled
not locked
not frozen
not expired: security count
not supported: enhanced erase
60min for SECURITY ERASE UNIT.
HW reset results:
CBLID- above Vih
Device num = 0 determined by the jumper
Checksum: correct
relevant part of dmesg without my fix:
sata_nv 0000:00:07.0: version 3.5
ACPI: PCI Interrupt Link [APSI] enabled at IRQ 22
ACPI: PCI Interrupt 0000:00:07.0[A] -> Link [APSI] -> GSI 22 (level,
low) -> IRQ 18
sata_nv 0000:00:07.0: Using ADMA mode
PCI: Setting latency timer of device 0000:00:07.0 to 64
scsi0 : sata_nv
scsi1 : sata_nv
ata1: SATA max UDMA/133 cmd 0x9f0 ctl 0xbf0 bmdma 0xd800 irq 18
ata2: SATA max UDMA/133 cmd 0x970 ctl 0xb70 bmdma 0xd808 irq 18
ata1: SATA link down (SStatus 0 SControl 300)
ata2: SATA link down (SStatus 0 SControl 300)
ACPI: PCI Interrupt Link [APSJ] enabled at IRQ 21
ACPI: PCI Interrupt 0000:00:08.0[A] -> Link [APSJ] -> GSI 21 (level,
low) -> IRQ 19
sata_nv 0000:00:08.0: Using ADMA mode
PCI: Setting latency timer of device 0000:00:08.0 to 64
scsi2 : sata_nv
scsi3 : sata_nv
ata3: SATA max UDMA/133 cmd 0x9e0 ctl 0xbe0 bmdma 0xc400 irq 19
ata4: SATA max UDMA/133 cmd 0x960 ctl 0xb60 bmdma 0xc408 irq 19
ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata3.00: ATA-7: Maxtor 6L250S0, BACE1G20, max UDMA/133
ata3.00: 490234752 sectors, multi 1: LBA48 NCQ (depth 31/32)
ata3.00: configured for UDMA/133
ata4: SATA link down (SStatus 0 SControl 300)
scsi 2:0:0:0: Direct-Access ATA Maxtor 6L250S0 BACE PQ: 0 ANSI: 5
ata3: bounce limit 0xFFFFFFFFFFFFFFFF, segment boundary 0xFFFFFFFF, hw segs 61
sd 2:0:0:0: [sda] 490234752 512-byte hardware sectors (251000 MB)
sd 2:0:0:0: [sda] Write Protect is off
sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't
support DPO or FUA
sd 2:0:0:0: [sda] 490234752 512-byte hardware sectors (251000 MB)
sd 2:0:0:0: [sda] Write Protect is off
sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't
support DPO or FUA
sda: sda1 sda2 < sda5 sda6 sda7 >
sd 2:0:0:0: [sda] Attached SCSI disk
sd 2:0:0:0: Attached scsi generic sg0 type 0
pata_amd 0000:00:06.0: version 0.3.9
PCI: Setting latency timer of device 0000:00:06.0 to 64
scsi4 : pata_amd
scsi5 : pata_amd
ata5: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xf000 irq 14
ata6: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xf008 irq 15
ata5.00: ATA-5: IC35L120AVVA07-0, VA6OA52A, max UDMA/100
ata5.00: 241254720 sectors, multi 1: LBA
ata5.01: ATAPI: HITACHI DVD-ROM GD-7500, 0005, max UDMA/33
ata5.00: configured for UDMA/100
ata5.01: configured for UDMA/33
ata6.00: ATA-6: IC35L120AVV207-0, V24OA66A, max UDMA/100
ata6.00: 241254720 sectors, multi 1: LBA48
ata6.01: ATAPI: LITE-ON LTR-40125S, ZS0P, max UDMA/33
ata6.00: limited to UDMA/33 due to 40-wire cable
ata6.00: configured for UDMA/33
ata6.01: configured for UDMA/33
scsi 4:0:0:0: Direct-Access ATA IC35L120AVVA07-0 VA6O PQ: 0 ANSI: 5
sd 4:0:0:0: [sdb] 241254720 512-byte hardware sectors (123522 MB)
sd 4:0:0:0: [sdb] Write Protect is off
sd 4:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 4:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't
support DPO or FUA
sd 4:0:0:0: [sdb] 241254720 512-byte hardware sectors (123522 MB)
sd 4:0:0:0: [sdb] Write Protect is off
sd 4:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 4:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't
support DPO or FUA
sdb: sdb1 sdb2 < sdb5 sdb6 >
sd 4:0:0:0: [sdb] Attached SCSI disk
sd 4:0:0:0: Attached scsi generic sg1 type 0
scsi 4:0:1:0: CD-ROM HITACHI DVD-ROM GD-7500 0005 PQ: 0 ANSI: 5
sr0: scsi3-mmc drive: 14x/40x cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.20
sr 4:0:1:0: Attached scsi CD-ROM sr0
sr 4:0:1:0: Attached scsi generic sg2 type 5
scsi 5:0:0:0: Direct-Access ATA IC35L120AVV207-0 V24O PQ: 0 ANSI: 5
sd 5:0:0:0: [sdc] 241254720 512-byte hardware sectors (123522 MB)
sd 5:0:0:0: [sdc] Write Protect is off
sd 5:0:0:0: [sdc] Mode Sense: 00 3a 00 00
sd 5:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't
support DPO or FUA
sd 5:0:0:0: [sdc] 241254720 512-byte hardware sectors (123522 MB)
sd 5:0:0:0: [sdc] Write Protect is off
sd 5:0:0:0: [sdc] Mode Sense: 00 3a 00 00
sd 5:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't
support DPO or FUA
sdc: sdc1 < sdc5 sdc6 >
sd 5:0:0:0: [sdc] Attached SCSI disk
sd 5:0:0:0: Attached scsi generic sg3 type 0
scsi 5:0:1:0: CD-ROM LITE-ON LTR-40125S ZS0P PQ: 0 ANSI: 5
sr1: scsi3-mmc drive: 164x/48x writer cd/rw xa/form2 cdda tray
sr 5:0:1:0: Attached scsi CD-ROM sr1
sr 5:0:1:0: Attached scsi generic sg4 type 5
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