On Wed, 23 Jun 1999, David A. Gatwood wrote:

On Wed, 23 Jun 1999, Kevin Puetz wrote:

quoted

Cool! Is there any hope of this working on the desktop machines that can 
sleep? (I like my machine getting quiet when not in use, though I can live
without.).

A desktop sleep is pretty different from a PowerBook sleep.  When a
desktop machine is asleep, it can still services network requests, and is
essentially still running, it just shuts a few things down.  The key there
is to figure out how to spin down and spin up the hard drive without
getting confused by the long delay on data access.  Then, when you do a
desktop sleep, you just cut the video sync, spin down the drives, and set
it up so that if there's any access to the drive, you spin it up long
enough to do the access, then wait a few seconds for the access to finish,
then spin back down.  Presumably, there's other stuff dealing with the
ADB, as far as shutting down other unused hardware and putting the
processor in a low speed setting or something, but I have no idea there.
Somebody else with actual cuda knowledge could probably say more in that
department.

I've had good luck with using hdparm to set the timeout to spin down the
disk in my powerbook.  I imagine it should work for most other people with
ide drives.  also, I noticed a rather dramatic speed increase setting the
PIO mode to 4, and "set IDE 32-bit IO setting"..  namely:

hdparm -S 5 /dev/hda  # sets standby timeout to 25 seconds..
hdparm -c 1 /dev/hda  # 32-bit transfer mode
hdparm -p 4 /dev/hda  # PIO mode 4
  or
hdparm -S 5 -c 1 -p 4 /dev/hda

there's all sorts of other options in there too, but they didn't seem to
make that much of a difference to me..  and note that I stopped using the
standby option as I was getting tired of listening to the disk spin up and
down, but that's how to do it if anyone cares..

ttyl,
  chris

Later,
David

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