Re: Cannot enable DMA on SATA drive (SCSI-libsata, VIA SATA)

[Jeff Garzik]

Petter Sundlöf wrote:
> Using 2.6.8.1. DMA works fine on /dev/hda (PATA, CD burner).
>
> When I try to enable it for my SATA drive (which is performing horribly 
> bad -- 80-90% CPU load on an AMD64 3200+ during copy of large files) I 
> get this error:

> sata_via(0000:00:0f.0): routed to hard irq line 10
> ata1: SATA max UDMA/133 cmd 0xE400 ctl 0xE002 bmdma 0xD000 irq 20
> ata2: SATA max UDMA/133 cmd 0xD800 ctl 0xD402 bmdma 0xD008 irq 20
> ata1: dev 0 cfg 49:2f00 82:7c6b 83:7f09 84:4003 85:7c69 86:3e01 87:4003 
> 88:407f
> ata1: dev 0 ATA, max UDMA/133, 398297088 sectors: lba48
> ata1: dev 0 configured for UDMA/133


DMA is always enabled.

	Jeff


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