Re: [CFT] Bus mastering support for IDE CDROM audio

Kristian
2002-01-28T13:54:08Z

Andrew Morton <akpm@zip.com.au> wrote:
> OK, Gents. Version three is at
>
> http://www.zip.com.au/~akpm/linux/2.4/2.4.18-pre7/ide-akpm-3.patch
>
> This attempts to overcome the situation where a drive/controller
> doesn't want to perform multiframe DMA, but is happy performing
> single-frame DMA.
> [...]

The third patch works fine.

When I'm doing "hdparm -c0 /dev/hdc" (16bit I/O) the system respond-ratio gets very low. (with all ide-cd-patches) I can see when gtk draws it's icons... But when I switch I/O back to 32 bit linux gets responsive again and cpu load decreases (~20%).

Tested with 2.4.18-pre3-ac2 and 2.4.17-lowlat-ide.

*Kristian

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