Subject: Disk constantly writing with softdeps?
To: None <firstname.lastname@example.org>
From: Ken Hornstein <email@example.com>
Date: 08/24/2000 12:29:28
I _finally_ got my laptop upgraded and in a reasonable state, so I tried
playing with the soft update code to see if it affects power management at
all. This is 1.5_ALPHA.
To my surprise, I discovered that when I mounted my filesystems with
soft updates turned on, I got a disk write once every 5-8 seconds, which
interacted with power management very badly (as you can imagine).
The same setup _without_ soft updates:
- Running X
- Filesystems mounted with async,noatime,nodevmtime ("async" is ignored
when you're using soft updates, of course),
- Connected to the network
Doesn't result in any disk I/O. In fact, I still get occasional disk
writes when I've exited X and I'm using soft updates.
I'm scratching my head on this one. Anyone got any ideas? I have no
fear in diving into the kernel and inserting various debugging printfs
to track down what's being written; I'm just wondering if anyone has