Re: hdparm / DMA problems

[Andreas Janssen <andreas.janssen@bigfoot.com>]

Hello

Nyc0n (<nyc0njunkmail@comcast.net>) wrote:

> To use hdparm to boost DMA speed, does DMA have to be enabled in the
> kernel?  i have the DMA enabled in the kernel, but some of my drives
> that should use it don't, so I used hdparm to help that out, before
> hdparm I was getting 3megs a second after hdparm I was getting 30megs
> a second, I was like sweet! More than quadrupuled the speed, so I
> added the stuff to the hwtools file In my rcS.d directory (part of the
> hwtools package) and then rebooted...i got the messages durning boot
> that DMA was being turned on etc, then I did the performance test
> again hdparm -Tt /dev/hd* and my speed when down to 8megs a second!

Did you set any other parameters than DMA the first time you used
hdparm? Did you set a specific DMA mode? Which mode does the drive use
if you use hdparm with the initscript?

best regards
        Andreas Janssen

-- 
Andreas Janssen
andreas.janssen@bigfoot.com
PGP-Key-ID: 0xDC801674
Registered Linux User #267976