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I know how to enable dma on the harddisks manually. How can I do
it first thing so that my bootup benefits from it?

Another question, how can you enable dma for a cdrom? hdparm can't
seem to do it.

Thanks!

In article <slrnbh1n14.cjo.noemail@news.easynews.com>, Big Daddy Butthead wrote:
> I know how to enable dma on the harddisks manually. How can I do
> it first thing so that my bootup benefits from it?
>

rc-update add hdparm boot

--
Jon Portnoy
avenj/irc.freenode.net
Opinions expressed are my own, not those of any entity I am
associated with unless stated otherwise.

* Big Daddy Butthead (2003-07-13 07:30 +0200)
> I know how to enable dma on the harddisks manually. How can I do
> it first thing so that my bootup benefits from it?

jed /etc/conf.d/hdparm; rc-update add hdparm boot

> Another question, how can you enable dma for a cdrom? hdparm can't
> seem to do it.

Sure it can. Try "hdparm /dev/hdc". Just be careful - I toasted two
older cdrom drives a few weeks ago with "-d1 -A1 -m16 -u1 -a64 -M128".

Thorsten
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Content-Type: text/explicit; charset=ISO-8859-666 (Parental Advisory)
Content-Transfer-Warning: message contains innuendos not suited for
children under the age of 18

Hi Jon!

> rc-update add hdparm boot
Overkill (:

All hdparm -d1 /dev/... to local.start

--
http://tam.belchenstuermer.de/

Jon Portnoy wrote:
>
> rc-update add hdparm boot
>

OK, I did that. And /etc/conf.d/hdparm has all_args="-d1" so I think
it should be working. Still my system becomes very jerky when reading
from the drive, for example it pauses every second or 2 when playing a
dvd (the drive is a dvd burner BTW) making it unwatchable. Is there a
way to check if dma is enabled? hdparm manually doesn't work:

# hdparm /dev/cdroms/cdrom0
/dev/cdroms/cdrom0 not supported by hdparm
#

Is this perhaps because the cdrom is using scsi emulation?

On Sun, 13 Jul 2003 15:27:10 +0000, Big Daddy Butthead wrote:

> Jon Portnoy wrote:
>>
>> rc-update add hdparm boot
>>
>
> OK, I did that. And /etc/conf.d/hdparm has all_args="-d1" so I think
> it should be working. Still my system becomes very jerky when reading
> from the drive, for example it pauses every second or 2 when playing a
> dvd (the drive is a dvd burner BTW) making it unwatchable. Is there a
> way to check if dma is enabled? hdparm manually doesn't work:
>
> # hdparm /dev/cdroms/cdrom0
> /dev/cdroms/cdrom0 not supported by hdparm
> #
>
> Is this perhaps because the cdrom is using scsi emulation?

Jon,

hdparm won't work through scsi emulation.

Look in /proc/ide/ ... /settings.
You can change these settings too.

Where ... is dependent on which ide device your dvd is.

Regards,

Roy Bamford
--

Computer users fall into two groups:-
Those that do backups
Those that have never had a hard drive fail

Roy Bamford wrote:
>
> Jon,
>
> hdparm won't work through scsi emulation.
>
> Look in /proc/ide/ ... /settings.
> You can change these settings too.
>
> Where ... is dependent on which ide device your dvd is.

My dvd is the master on the second ide device (ide1). The settings
file for /dev/hdc shows dma off, and I think my dvd is /dev/hdc, though
in fstab it is listed as /dev/cdroms/cdrom0 which is linked to
/dev/scsi/host0/bus0/target0/lun0/cd. I am confused as to how/where
the cdrom device actually gets linked to /dev/hdc, but it must be
it because I only have 2 other drives, and they are hda and hdb.

So the next question is, how to I change the settings file for /dev/hdc.
It is not an editable file.

In article <berepj$87adg$2@ID-106772.news.uni-berlin.de>, Timo Maier wrote:
> Hi Jon!
>
>> rc-update add hdparm boot
> Overkill (:
>
> All hdparm -d1 /dev/... to local.start
>

How is it overkill? By default the rc script just uses -d1, but lets you
tweak it in /etc/conf.d/hdparm - it provides much nicer output than
running it from local.start. Additionally it enables it for _all_
drives.

--
Jon Portnoy
avenj/irc.freenode.net
Opinions expressed are my own, not those of any entity I am
associated with unless stated otherwise.

"Big Daddy Butthead" <noemail@yahoo.com> wrote in message
news:slrnbh1n14.cjo.noemail@news.easynews.com...
> I know how to enable dma on the harddisks manually. How can I do
> it first thing so that my bootup benefits from it?
>
> Another question, how can you enable dma for a cdrom? hdparm can't
> seem to do it.
>
> Thanks!

Enabling DMA on scsi-emulated IDE devices can be a bit of a problem.
I can think of two ways to do it. The first is to directly edit the values
in
/proc/ide/hdX/settings; where X is your specific device. I could never
get enough info to try this. The second requires that the
cdrom,ide-cd,sg,sr_mod and ide-scsi modules not be compiled
into the kernel and that the booloader does not enable scsi emulation.
A properly funcioning devfs is also needed. This also requires that these
modules not be loaded through modules.autoload(or elsewhere).In a startup
script you
might use something like the following:

hdparm -d1 /dev/hdX
rmmod cdrom
rmmod ide-cd
modprobe ide-scsi
modprobe sg
modprobe sr_mod

The general idea is to play with hdparm for the optical drives before
enabling
scsi emulation with ide-scsi. I am writing this from memory because I don't
have
access to the machines that I have done this procedure. I may be leaving out
some of the scsi modules that are needed but I hope that you get the general
idea

Steve.

Jon Portnoy wrote:

> In article <berepj$87adg$2@ID-106772.news.uni-berlin.de>, Timo Maier
> wrote:

>>> rc-update add hdparm boot

> How is it overkill? By default the rc script just uses -d1, but lets you

Further more the dma is enabled much earlier which speeds up the boot
process.

mg