[Qemu-devel] Re: DMA with Knoppix and qemu (cvs-version)

[Sven Köhler]

> Just a note: setting DMA through hdparm doesn't work on Linux since
> tens of versions ago, it's been depreceted and you have to trust the
> on-boot autodetection (and it works fine -- unless you didn't compile
> the right driver in). It's the same on real machines.

WHAT!?

i have used it with Knoppix since ages. Knoppix has DMA disabled (for
some reason). Most of the time i boot knoppix with "dma" in the
append-line, but in the other cases, hdparm works and improves
performance dramatically.