No DMA on a Dell Latitude D820 with >2.6.20

No DMA on a Dell Latitude D820 with >2.6.20

[Mikel Olasagasti]

Hi,

I'm having problems with my disk on a Latitude D820 after upgrading
kernel to any >2.6.20 No DMA support can be activated, giving me a very
poor I/O performance.

I'm using ata_piix driver on a ICH7 system with no AHCI support AFAIK

I opened a thread[1] on gentoo-forums (the distro I use) with all the
output i think can be interesting.

Hope you can help me guys. Thanks for all :)

[1] http://forums.gentoo.org/viewtopic-p-4731161.html 
-- 
Mikel Olasagasti <hey_neken@mundurat.net>

Re: No DMA on a Dell Latitude D820 with >2.6.20

[Mark Lord]

Mikel Olasagasti wrote:
> Hi,
> 
> I'm having problems with my disk on a Latitude D820 after upgrading
> kernel to any >2.6.20 No DMA support can be activated, giving me a very
> poor I/O performance.
> 
> I'm using ata_piix driver on a ICH7 system with no AHCI support AFAIK
..

Actually, no.  You are really using the IDE driver ("hda") for your disk
on the 2.6.23 kernel.

You can fix this by just not including the IDE driver in your kernel build,
and by fixing your /boot/grub/menu.lst file to use root=/dev/sda6
instead of root=/dev/hda6.

Plus whatever special soup gentoo might require.

Cheers


> I opened a thread[1] on gentoo-forums (the distro I use) with all the
> output i think can be interesting.
> 
> Hope you can help me guys. Thanks for all :)
> 
> [1] http://forums.gentoo.org/viewtopic-p-4731161.html