Re: xfssyncd syncing every five seconds?

[Karol Kozimor <sziwan@xxxxxxxxxxx>]

Thus wrote Steve Lord:
> > Please do search for laptop-mode patches published on lkml several times.
> > They have a sysctl setting that, when turned on, dumps the processes or
> > threads doing I/O on screen. Using that patch, I was able to successfully
> > spin my disk down to about 1 minute (the maximum sysctl setting for
> > xfssyncd or the other).
> Using a current CVS kernel, and redhat 9.0 user space, I can get
> my laptop to sit there with a suspended ide drive for 10 minutes
> before something pops off and writes to a log file. I mounted all
> filesystems with noatime and stopped crond.

When doing no work on the machine itself? Right, if I leave mine alone, the
drive is spun down for several minutes (never actually bothered to count
them) -- not that it saves much power, though. However, I believe we would
want to actually let people do some work, and as far as I understand it
now, whenever the pages get dirty or whatever write gets pending, the disk
is powered on after a minute or so. Is the there a specific reason for
which the sysctls max out at 60 seconds?
Best regards,

-- 
Karol 'sziwan' Kozimor
sziwan@xxxxxxxxxxx