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Subject2.6.25 DMA: Out of SW-IOMMU space - Asus M2N32 AMD 8GB memory

Message from /etc/syslog:

[1] Aug 21 11:01:19 jondo kernel: [174628.275859] DMA: Out of SW-IOMMU space for 65536 bytes at device 0000:00:0d.0

My AMD freezes with Kernel 2.6.25 has experienced regular freezing so
that only power button can take the system down. This is alarming,
because the system can stay up only a few days.

I've spent countless of hours reading related "Out of SW-IOMMU space"
(Google) documents. For some people they have worked, for some they
haven't and there has not been any clear explanation what options
whould/should be used in what chipsets/MBs and why.

I've gone through various combinations of kernel boot options, but
nothing seems to completely solve the problem:

iommu=soft swiotlb=65536

Freezing continued, but the disk corruption did not happen any more.
Increasing the swiotlb value has not had helped.

iommu=soft,memaper=3 swiotlb=65536

Adding memaper did not help. "Out of SW-IOMMU space" messages [see
1] creept in and I'm preparing to see another freeze eventally.


Same as above. Not progress.

iommu=noagp,noaperture swiotlb=512M

Current options that I use. They were giving hope for 2 days,
but then a single "Out of SW-IOMMU space" message appeared. I'm
afraid the freeze is about to come.

Should I try following options next? or just "iommu=off"?

iommu=noagp,noaperture,off swiotlb=512M

I don't understand enough what are the effects related to the MCP55 SATA
Controller which seems to be the target [See 1; based on device id
"00:0d.0"] of these IOMMU messages. Only the plain SATA connectors, not
the onboard RAID SATA connectors, are in use for the harddisk.

To best of my knowledge going through this motherboard:

- Asus award bios does not have setting related to IOMMU. I'm using the
latest bios 2001 from
- has no aperture setting in bios.
- has no AGP, only PCI and CPIe slots.

My arsenal of knowledge is exhausting, so please, if you have any
insight what could be examined further or what could be done to solve
the IOMMU problem, let me know.


Some of the links and threads I've read

"Appendix L. Known Issues" > The X86-64 platform (AMD64/EM64T) and 2.6 kernels

"What is AGP Aperture size?"

"PCI-DMA: high address but no IOMMU"

"Out of IOMMU space"

"Your BIOS doesn't leave a aperture memory hole"

Hardware details
$ cat /etc/debian_version
lenny/sid (pinning: that's 90% testing + 10% unstable packages)

$ uname -a
2.6.25-2-amd64 #1 SMP Mon Jul 14 11:05:23 UTC 2008 x86_64 GNU/Linux

$ cat /proc/cpuinfo
model name : AMD Athlon(tm) X2 Dual Core Processor BE-2400
stepping : 2
cpu MHz : 2310.518
cache size : 512 KB

$ cat /proc/meminfo
MemTotal: 8266632 kB
MemFree: 110212 kB
Buffers: 237132 kB
Cached: 3803660 kB
SwapCached: 0 kB

$ hdparm -I /dev/sda

ATA device, with non-removable media
Model Number: ST31000340AS
Serial Number: 5QJ01MS4
Firmware Revision: SD01


Asus M2N32-SLI Deluxe/Wireless Edition
- nvidia nForce 590 SLI chipset MCP
- 2 x PCIe (SLI x16), 1 x PCI (x4), 1 x PCI (x1), 2 x PCI 2.2
- Socket AM2

$ lspci -nn
00:0d.0 IDE interface [0101]: nVidia Corporation MCP55 SATA Controller [10de:037f] (rev a2)
01:00.0 VGA compatible controller [0300]: nVidia Corporation G70 [GeForce 7600 GS] [10de:0392] (rev a1)
02:0b.0 FireWire (IEEE 1394) [0c00]: Texas Instruments TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link) [104c:8023]
03:00.0 Mass storage controller [0180]: Silicon Image, Inc. SiI 3132 Serial ATA Raid II Controller [1095:3132] (rev 01)

lspci -vv

00:16.0 PCI bridge: nVidia Corporation MCP55 PCI Express bridge (rev a2)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 32 bytes
Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
I/O behind bridge: 00009000-00009fff
Memory behind bridge: fde00000-fdefffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Subsystem: nVidia Corporation Device 0000
Capabilities: [48] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+ Queue=0/1 Enable+
Address: 00000000fee0300c Data: 4151
Capabilities: [60] HyperTransport: MSI Mapping Enable+ Fixed-
Mapping Address Base: 00000000fee00000
Capabilities: [80] Express (v1) Root Port (Slot+), MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <512ns, L1 <4us
ExtTag- RBE+ FLReset-
DevCtl: Report errors: Correctable+ Non-Fatal+ Fatal+ Unsupported+
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
LnkCap: Port #1, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <512ns, L1 <4us
ClockPM- Suprise- LLActRep+ BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive+ BWMgmt- ABWMgmt-
SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug- Surpise-
Slot # 0, PowerLimit 0.000000; Interlock- NoCompl-
SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
Control: AttnInd Off, PwrInd On, Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
Changed: MRL- PresDet+ LinkState+
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
RootCap: CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
Capabilities: [100] Virtual Channel <?>
Kernel driver in use: pcieport-driver
Kernel modules: shpchp

[1] Full message from syslog

Aug 21 11:01:19 jondo kernel: [174628.275859] DMA: Out of SW-IOMMU space for 65536 bytes at device 0000:00:0d.0
Aug 21 11:01:19 jondo kernel: [174628.279020] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
Aug 21 11:01:19 jondo kernel: [174628.279020] ata3.00: cmd 35/00:00:9f:b9:fd/00:04:71:00:00/e0 tag 0 dma 524288 out
Aug 21 11:01:19 jondo kernel: [174628.279020] res 50/00:00:96:b9:fd/00:00:71:00:00/e0 Emask 0x40 (internal error)
Aug 21 11:01:19 jondo kernel: [174628.279020] ata3.00: status: { DRDY }
Aug 21 11:01:19 jondo kernel: [174628.322932] ata3.00: configured for UDMA/133
Aug 21 11:01:19 jondo kernel: [174628.322932] ata3: EH complete
Aug 21 11:01:19 jondo kernel: [174628.330761] sd 2:0:0:0: [sda] 1953525168 512-byte hardware sectors (1000205 MB)
Aug 21 11:01:19 jondo kernel: [174628.340876] sd 2:0:0:0: [sda] Write Protect is off
Aug 21 11:01:19 jondo kernel: [174628.340876] sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
Aug 21 11:01:19 jondo kernel: [174628.351250] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA


[ 0.914265] Linux agpgart interface v0.103
[ 3.687719] ata1: SATA link down (SStatus 0 SControl 0)
[ 5.770299] ata2: SATA link down (SStatus 0 SControl 0)
[ 5.582800] ACPI: PCI Interrupt Link [APC3] enabled at IRQ 18
[ 5.582811] ACPI: PCI Interrupt 0000:02:08.1[A] -> Link [APC3] -> GSI 18 (level, low) -> IRQ 18
[ 5.584163] NFORCE-MCP55: 0000:00:0c.0 (rev a1) UDMA133 controller
[ 5.584167] NFORCE-MCP55: IDE controller (0x10de:0x036e rev 0xa1) at PCI slot 0000:00:0c.0
[ 5.584187] NFORCE-MCP55: not 100% native mode: will probe irqs later
[ 5.584194] NFORCE-MCP55: IDE port disabled
[ 5.584198] ide0: BM-DMA at 0xf400-0xf407, BIOS settings: hda:DMA, hdb:DMA
[ 5.584208] Probing IDE interface ide0...
[ 5.661667] firewire_ohci: Added fw-ohci device 0000:02:08.1, OHCI version 1.10
[ 5.661706] ACPI: PCI Interrupt Link [APC1] enabled at IRQ 16
[ 5.661706] ACPI: PCI Interrupt 0000:02:0b.0[A] -> Link [APC1] -> GSI 16 (level, low) -> IRQ 16
[ 5.732701] firewire_ohci: Added fw-ohci device 0000:02:0b.0, OHCI version 1.10
[ 6.345280] ACPI: PCI Interrupt Link [APCL] enabled at IRQ 20
[ 6.345280] ACPI: PCI Interrupt 0000:00:0a.1[B] -> Link [APCL] -> GSI 20 (level, low) -> IRQ 20
[ 6.345280] PCI: Setting latency timer of device 0000:00:0a.1 to 64
[ 6.345280] ehci_hcd 0000:00:0a.1: EHCI Host Controller
[ 6.345280] ehci_hcd 0000:00:0a.1: new USB bus registered, assigned bus number 2
[ 6.345280] ehci_hcd 0000:00:0a.1: debug port 1
[ 6.345280] PCI: cache line size of 64 is not supported by device 0000:00:0a.1
[ 6.345280] ehci_hcd 0000:00:0a.1: irq 20, io mem 0xfe02e000

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