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I consider myself quite experienced, and have been getting always deeper into
Slackware and Linux.
In a recent fsck process, I was told that the DMA on the (only) hard disk on my laptop
was not enabled.
I would like to enable it. I have kernel 184.108.40.206 freshly reconfigured, and I'm quite
sure I have the necessary options for DMA enabled!
Do I need some kernel parameters?
I am on a DELL C600 (P3cm) Laptop, with Slackware 10.2.
That said... DMA will usually enable itself by default, unless the kernel doesn't have the right IDE driver enabled. You may need to recompile the kernel to enable support for your chipset. Check the results of lspci and make sure that the IDE controller is enabled in your kernel configuration.
I had the similar problem on hp nx6125 laptop (which has amd processor and ati chipset). enabling dma was not permitting by hdparm. and disk reading was very slow. I compiled 2.6.14 kernel and I checked ati chipset support and unchecked pII intel support from kernel options of devices-->ata section. now dma is working but still very slow. but when i tried the precompiled kernel 2.6.13 from slackware cd, there were no dma and slowness problem.