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Subject[BUG?] ata disk running maximum at DMA33 with 2.6.20 and new pata driver, NV CK804 ide controller.
Date
Hi,
since upgrading to kernel 2.6.20 my pata disk, using new pata driver, is
initialized maximum in DMA33 mode (and obviously performances drop
consequently), as you can see from:

pata_amd 0000:00:06.0: version 0.2.7
PCI: Setting latency timer of device 0000:00:06.0 to 64
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
scsi4 : pata_amd
ata5.00: ATA-7, max UDMA/100, 156368016 sectors: LBA48
ata5.00: ata5: dev 0 multi count 1
ata5.00: configured for UDMA/33
scsi5 : pata_amd
ata6.00: ATAPI, max UDMA/33
ata6.00: configured for UDMA/33
scsi 4:0:0:0: Direct-Access ATA SAMSUNG SP0822N WA10 PQ: 0 ANSI:
5
SCSI device sdc: 156368016 512-byte hdwr sectors (80060 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: write cache: enabled, read cache: enabled, doesn't
support DPO
or FUA
SCSI device sdc: 156368016 512-byte hdwr sectors (80060 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: write cache: enabled, read cache: enabled, doesn't
support DPO
or FUA
sdc: sdc1 sdc2 sdc3
sd 4:0:0:0: Attached scsi disk sdc

while with kernel 2.6.19.X it was initialized correctly in DMA100 mode:

pata_amd 0000:00:06.0: version 0.2.4
PCI: Setting latency timer of device 0000:00:06.0 to 64
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
scsi4 : pata_amd
ata5.00: ATA-7, max UDMA/100, 156368016 sectors: LBA48
ata5.00: ata5: dev 0 multi count 1
ata5.00: configured for UDMA/100
scsi5 : pata_amd
ata6.00: ATAPI, max UDMA/33
ata6.00: configured for UDMA/33
scsi 4:0:0:0: Direct-Access ATA SAMSUNG SP0822N WA10 PQ: 0 ANSI: 5
SCSI device sdc: 156368016 512-byte hdwr sectors (80060 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write back
SCSI device sdc: 156368016 512-byte hdwr sectors (80060 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write back
sdc: sdc1 sdc2 sdc3
sd 4:0:0:0: Attached scsi disk sdc
I have other 2 sata disks on this system, and I have no problems with
them. I Wonder if this is due to some controller/disk problem triggered
just by 2.6.20 kernel (I saw there are a lot of changes into eh code),
while 2.6.19.X and previous sees everything OK.

Also forf the sata disks, in fact, I see this "doesn't support DPO or FUA"
warning, but I have to admit I do not know which features it is referred to.
This system is an Athlon64 X2 3800+ with an nvidia2 IDE controller

here is the lspci -v

00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev
a3)
Subsystem: ASUSTeK Computer Inc. Unknown device 815a
Flags: bus master, 66MHz, fast devsel, latency 0
Capabilities: [44] HyperTransport: Slave or Primary Interface
Capabilities: [e0] HyperTransport: MSI Mapping

00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev a3)
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0

00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: 66MHz, fast devsel, IRQ 10
I/O ports at e400 [size=32]
I/O ports at 4c00 [size=64]
I/O ports at 4c40 [size=64]
Capabilities: [44] Power Management version 2

00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
(prog-if 10 [OHCI])
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 20
Memory at d4004000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [44] Power Management version 2

00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
(prog-if 20 [EHCI])
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 22
Memory at d4005000 (32-bit, non-prefetchable) [size=256]
Capabilities: [44] Debug port
Capabilities: [80] Power Management version 2

00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio
Controller (rev a2)
Subsystem: ASUSTeK Computer Inc. Unknown device 8166
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 23
I/O ports at dc00 [size=256]
I/O ports at e000 [size=256]
Memory at d4003000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [44] Power Management version 2

00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2) (prog-if 8a
[Master SecP PriP])
Subsystem: Unknown device f043:815a
Flags: bus master, 66MHz, fast devsel, latency 0
[virtual] Memory at 000001f0 (32-bit, non-prefetchable) [disabled]
[size=8]
[virtual] Memory at 000003f0 (type 3, non-prefetchable) [disabled]
[size=1]
[virtual] Memory at 00000170 (32-bit, non-prefetchable) [disabled]
[size=8]
[virtual] Memory at 00000370 (type 3, non-prefetchable) [disabled]
[size=1]
I/O ports at f000 [size=16]
Capabilities: [44] Power Management version 2
00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev
f3) (prog-if 85 [Master SecO PriO])
Subsystem: ASUSTeK Computer Inc. Unknown device 815a
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 23
I/O ports at 09f0 [size=8]
I/O ports at 0bf0 [size=4]
I/O ports at 0970 [size=8]
I/O ports at 0b70 [size=4]
I/O ports at d800 [size=16]
Memory at d4002000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [44] Power Management version 2

00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev
f3) (prog-if 85 [Master SecO PriO])
Subsystem: ASUSTeK Computer Inc. K8N4-E Mainboard
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 22
I/O ports at 09e0 [size=8]
I/O ports at 0be0 [size=4]
I/O ports at 0960 [size=8]
I/O ports at 0b60 [size=4]
I/O ports at c400 [size=16]
Memory at d4001000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [44] Power Management version 2

00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev a2) (prog-if
01 [Subtractive decode])
Flags: bus master, 66MHz, fast devsel, latency 0
Bus: primary=00, secondary=05, subordinate=05, sec-latency=128
I/O behind bridge: 0000a000-0000afff
Memory behind bridge: d2000000-d3ffffff
Prefetchable memory behind bridge: 88000000-880fffff
00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev a3)
Subsystem: ASUSTeK Computer Inc. Unknown device 816a
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 21
Memory at d4000000 (32-bit, non-prefetchable) [size=4K]
I/O ports at b000 [size=8]
Capabilities: [44] Power Management version 2
00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if
00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
Capabilities: [40] Power Management version 2
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1
Enable+
Capabilities: [58] HyperTransport: MSI Mapping
Capabilities: [80] Express Root Port (Slot+) IRQ 0
Capabilities: [100] Virtual Channel

00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if
00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
Capabilities: [40] Power Management version 2
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1
Enable+
Capabilities: [58] HyperTransport: MSI Mapping
Capabilities: [80] Express Root Port (Slot+) IRQ 0
Capabilities: [100] Virtual Channel

00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if
00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
Capabilities: [40] Power Management version 2
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1
Enable+
Capabilities: [58] HyperTransport: MSI Mapping
Capabilities: [80] Express Root Port (Slot+) IRQ 0
Capabilities: [100] Virtual Channel

00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3) (prog-if
00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 00009000-00009fff
Memory behind bridge: d0000000-d1ffffff
Prefetchable memory behind bridge:
00000000c0000000-00000000cff00000
Capabilities: [40] Power Management version 2
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/1
Enable+
Capabilities: [58] HyperTransport: MSI Mapping
Capabilities: [80] Express Root Port (Slot+) IRQ 0
Capabilities: [100] Virtual Channel
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
HyperTransport Technology Configuration
Flags: fast devsel
Capabilities: [80] HyperTransport: Host or Secondary Interface

00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Address
Map
Flags: fast devsel

00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
DRAM Controller
Flags: fast devsel

00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Miscellaneous Control
Flags: fast devsel

01:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60 [Radeon
X300
(PCIE)] (prog-if 00 [VGA])
Subsystem: PC Partner Limited Unknown device 1490
Flags: bus master, fast devsel, latency 0, IRQ 3
Memory at c0000000 (32-bit, prefetchable) [size=256M]
I/O ports at 9000 [size=256]
Memory at d1000000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at d0000000 [disabled] [size=128K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Express Endpoint IRQ 0
Capabilities: [80] Message Signalled Interrupts: 64bit+ Queue=0/0
Enable-
Capabilities: [100] Advanced Error Reporting
01:00.1 Display controller: ATI Technologies Inc RV370 [Radeon X300SE]
Subsystem: PC Partner Limited Unknown device 1491
Flags: fast devsel
Memory at d1010000 (32-bit, non-prefetchable) [disabled]
[size=64K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Express Endpoint IRQ 0
05:02.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host
Controller (rev 80) (prog-if 10 [OHCI])
Subsystem: ASUSTeK Computer Inc. A8V Deluxe
Flags: bus master, stepping, medium devsel, latency 32, IRQ 19
Memory at d3001000 (32-bit, non-prefetchable) [size=2K]
I/O ports at a000 [size=128]
Capabilities: [50] Power Management version 2

05:04.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado]
(rev 78)
Subsystem: 3Com Corporation 3C905C-TX Fast Etherlink for PC
Management NIC
Flags: bus master, medium devsel, latency 32, IRQ 17
I/O ports at a400 [size=128]
Memory at d3000000 (32-bit, non-prefetchable) [size=128]
[virtual] Expansion ROM at 88000000 [disabled] [size=128K]
Capabilities: [dc] Power Management version 2

Willing to test any patch.


thanx

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