pmud options quirk
Hi all,
I've recently gotten a new HD for my TiBook (40 Gig :), which makes
relatively loud noise when moving the head.
At first, it did that every five seconds, which, as you can imagine, is
unsupportable after a few minutes.
I've since tried to find what accesses the disk every five seconds, and
come to the combination pmud with APM emulation/asapm.
Now to the problem I found with pmud:
- To start with, is it normal that the disk accesses the on-disk data
for the FIFO _that_ often? It seems both pmud and asapm are configured
with 1 second intervals for writing/reading the FIFO.
- My first thought was to move the APM emulation FIFO out of /etc/power
onto a tmpfs partition. File in memory; no disk access needed... But
trying to do that I've found a weird behaviour with pmud's options:
Specifying 'pmud -a /tmpfs/apm' just silently ignores option '-a'.
Recompiling pmud from source with some debug printk's proved that. The
solution was to remove the space between '-a' and the argument.
Normal? Bug in pmud? Bug in getopt_long()?
While we're at it, does anybody have other ideas to eliminate disk
acceses? I've already done these:
- switch back to ext2 from ext3 (ext3 prevents the HD from spinning
down)
- install noflushd
- tune the bdflush parameters in /proc/sys/vm
- remount with noatime while on battery
In particular, how about devfs? I'd suppose having devfs in memory saves
the atime/ctime/mtime changes on the /dev FS nodes (which is metadata to
the FS, right?)?
Cheers, and thanks for any comments
Michel
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Michel Lanners | " Read Philosophy. Study Art.
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