Re: DMA not working on SATA?

[Alan Cox]

> of read performance with hdparm but heavy IO still makes the machine
> sluggish, with top showing ~80% of the time in the wait state (and
> loadavg shooting up). This seems like a DMA problem because I was under

Load average includes wait states for disk.

> [   30.999213] ata1.00: ATA-7: ST3160815AS, 3.AAD, max UDMA/133
> [   30.999216] ata1.00: 312581808 sectors, multi 16: LBA48 NCQ (depth
> 31/32)
> [   31.054773] usb 7-1.2: configuration #1 chosen from 1 choice
> [   31.055515] usbcore: registered new interface driver libusual
> [   31.057399] ata1.00: configured for UDMA/133

So it is running at UDMA133



> [   32.934174] ata7.00: ATAPI: TSSTcorpDVD-ROM SH-D162D, SB00, max
> UDMA/33
> [   33.105820] ata7.00: configured for UDMA/33

CD-ROM at UDMA 33


> [   39.285949] nvidia: module license 'NVIDIA' taints kernel

And any problems beyond that point are ones you need to take up with
Nvidia as they have all the source code but we don't have theirs.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/