Hi Lorenzo,
I'm using kernel 2.6.12.4 (vanilla), recompiled, on a Kubuntu, and when
I try to enable DMA, I get this error:
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
lspci | grep IDE
0000:00:1f.1 IDE interface: Intel Corp. 82801DBM (ICH4) Ultra ATA
Storage Controller (rev 01)
I have the same controller (rev 03, however) and I never got DMA to work
when PIIX was loaded as a module. Once I compiled it statically into my
kernel (currently a custom 2.6.12 on a Debian Sid system) the problem
vanished without further work and DMA was activated automatically when I
booted into the new kernel.
I then tweaked my /etc/hdparm.conf a bit more (hdc is a dvd/cdrom):
/dev/hda {
mult_sect_io = 16
dma = on
io32_support = 1
interrupt_unmask = on
}
/dev/hdc {
dma = on
io32_support = 1
interrupt_unmask = on
}
The main increase in speed, however, came from just turning on DMA. (3-4
times faster for 'hdparm -t /dev/hda')
I hope this helps.
Regards,
Florian
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