How to activate UDMA for HD ?

dcro · Apprentice Joined: 29 Aug 2002 Posts: 160

I would like to know what are the option(s) to be activated in kernel to have DMA by default ?

I have the gento kernel 2.4.19-gentoo-r10

rbonthond · Apprentice Joined: 24 Jun 2002 Posts: 190

cd /usr/src/linux
make menuconfig
ATA/IDE/MFM/RLL support ->
enable ATA/IDE/MFM/RLL support
IDE, ATA and ATAPO Block devices ->
enable Generic PCI bus-master DMA support
enable Use PCI DMA by default when available

DMA/UDMA detected will be mostly handled by the drivers.

You could try to fiddle with hdparm (i never tried it):
http://www.tldp.org/HOWTO/mini/Ultra-DMA-8.html

solarier · n00b Joined: 04 Dec 2002 Posts: 2

Why don't try hdparm it've enhanced my HD performance a lot
on my Redhat box.

darktux · Posted: Wed Dec 04, 2002 1:22 pm Post subject:

YEs, do you hdparm, there are lots of threads with advices to boost your HD's performance through hdparm.

https://forums.gentoo.org/search.php is your friend :wink:

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lx · Posted: Wed Dec 04, 2002 1:43 pm Post subject:

I don't think he askes how to get UDMA activated, but how too compile the kernel so it activates DMA without using hdparm and thus at the start of the system.

I have the option always activate DMA, or something activated (kernel 2.5.50), but still this doesn't activate UDMA, well at startup it says DMA: disabled, hdparm fixes this later on in boot sequence. I'm though am interested if it's possible,

Cya lX.
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Malakin · Posted: Wed Dec 04, 2002 10:59 pm Post subject:

Having the kernel enable DMA automatically is the proper way of doing this IMO.