Re: SOLVED: DMA is turned off on my HDD
Andrei Popescu wrote:
amd74xx module seems to be included in my initrd:
[...]
lib/modules/2.6.25-2-686/kernel/drivers/ide/ide-generic.ko
And so is ide-generic. You could try to rebuild the initrd without it,
BUT:
1. I don't know how to do it
2. You might end up with an unbootable system
For 1. it might be enough to just rebuild the initrd with the
blacklisted module. Otherwise you will have to unpack it, remove the
module and repack it. You should be able to find instructions on the net
for this procedure.
To avoid 2. it would be best to keep the current initrds and create a
backup stanza in grub to use it.
Regards,
Andrei
Great thanks to Ron Johnson, Pavlos Parissis, Bob Cox, Florian Kulzer,
Chris Bannister & Andrei Popescu.
I have read some docs in the inet. I have understood what is initrd, how
to use initramfs-tools debian package (in particular, update-initramfs
command and "/etc/initramfs-tools/modules" file). I have being intended
to add "blacklist ide-generic" string to "/etc/initramfs-tools/modules"
file & to run "initramfs-tools -k $(uname -r) -u" command but when I
opened this file I was shocked. That is I have seen:
# Added by Debian Installer
ide-generic
I decided simply delete this string from "modules" file (and update
initrd then). And it has solved the problem!
While rebooting I haven't being seen warning message from fsck (about
turned off dma mode). And after reboot I was convinced that DMA is on:
leva:/home/anthony/admin# hdparm /dev/hda
/dev/hda:
multcount = 0 (off)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 16383/255/63, sectors = 234441648, start = 0
Moreover my system became much faster and Debian boot time (from Grub to
X11) (which I can see in the new 2.6.25 kernel) has reduced from 90
seconds to 30 seconds!
Now I suppose that 2nd Florian's solution (booting with
"blacklist=ide_generic" appended to the kernel command line) hasn't
helped me because ill-started module was "ide-generic" (nor
"ide_generic" (minus instead of underscope)). If I make mistakes please
correct me.
Nevertheless, I don't understand why Debian Installer add this
ill-started module to "/etc/initramfs-tools/modules" file. Seems the bug
to be Debian-specific.
For information: I was install Lenny from netinst 7.3MB mini.iso (Lenny,
i386, built before 2008-07-02) (downloaded from
ftp://ftp.mgts.by/pub/debian-cd/ mirror). I use "ftp.mgts.by/debian/"
Debian mirror.
Now I'm intended to update initrd for all my kernels ;).
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