Copying large files (10G) cause a SW reset of the SATA channel / drive.

Hi,

Problem:
  The machine becomes somewhat unresponsive during the process as its flooding dmesg and also attempting to
reset the controller from what it looks like.

Environment:

In my Dom0 machine, I copy disk images (DomUs) so I can rebuild various software environments. In this
particular instance, I was trying to attempting to overwrite an existing img with a pristine one (cp build.img build-johnny.img)
where the image is 10G. I'm running Ubuntu 8.0.4.1 on AMD64 box with an ICH9 controller using
a WDC WD2500AAJS-7 drive.

An excerpt of the messages:
[ 1194.969287] PCI-DMA: Out of SW-IOMMU space for 49152 bytes at device 0000:00:1f.2
[ 1194.990965] ata1.00: exception Emask 0x0 SAct 0x10 SErr 0x0 action 0x0
[ 1194.990990] ata1.00: cmd 61/00:20:ae:47:12/04:00:02:00:00/40 tag 4 ncq 524288 out
[ 1194.990991] res 40/00:14:ae:37:12/00:00:02:00:00/40 Emask 0x40 (internal error)
[ 1194.991020] ata1.00: status: { DRDY }
[ 1194.993547] ata1.00: configured for UDMA/133
[ 1194.993552] ata1: EH complete
[ 1194.368923] sd 0:0:0:0: [sda] 488281250 512-byte hardware sectors (250000 MB)
[ 1194.368935] sd 0:0:0:0: [sda] Write Protect is off
[ 1194.368937] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[ 1194.368950] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 1195.117981] PCI-DMA: Out of SW-IOMMU space for 32768 bytes at device 0000:00:1f.2
[ 1195.155890] ata1.00: exception Emask 0x0 SAct 0x20 SErr 0x0 action 0x0
[ 1195.155923] ata1.00: cmd 61/00:28:b6:5f:12/04:00:02:00:00/40 tag 5 ncq 524288 out
[ 1195.155924] res 40/00:0c:1e:52:12/00:00:02:00:00/40 Emask 0x40 (internal error)
[ 1195.155953] ata1.00: status: { DRDY }
[ 1195.157974] ata1.00: configured for UDMA/133
[ 1195.157980] ata1: EH complete
[ 1195.159071] PCI-DMA: Out of SW-IOMMU space for 65536 bytes at device 0000:00:1f.2
[ 1195.177964] ata1.00: exception Emask 0x0 SAct 0x10 SErr 0x0 action 0x0
[ 1195.177988] ata1.00: cmd 61/00:20:b6:6f:12/04:00:02:00:00/40 tag 4 ncq 524288 out
[ 1195.177989] res 40/00:04:b6:5f:12/00:00:02:00:00/40 Emask 0x40 (internal error)
[ 1195.178018] ata1.00: status: { DRDY }
[ 1195.180487] ata1.00: configured for UDMA/133
[ 1195.180492] ata1: EH complete