[fedora-virt] does ksm really work?

[sean darcy]

I'm running kvm on F14. I'm running 2 XP clones. The ksm and ksmtuned
demons are running.

Yet:

 for ii in /sys/kernel/mm/ksm/* ; do echo -n "$ii: " ; cat $ii ; done
/sys/kernel/mm/ksm/full_scans: 0
/sys/kernel/mm/ksm/pages_shared: 0
/sys/kernel/mm/ksm/pages_sharing: 0
/sys/kernel/mm/ksm/pages_to_scan: 100
/sys/kernel/mm/ksm/pages_unshared: 0
/sys/kernel/mm/ksm/pages_volatile: 266200
/sys/kernel/mm/ksm/run: 0
/sys/kernel/mm/ksm/sleep_millisecs: 20

And yes, I've echo'd 1 to sys/kernel/mm/ksm/run, but it gets reset to
0 after about a minute (ksmtuned at work?).

When does ksm do its stuff? This is a pretty big machine (16G). Does
it wait until there's memory pressure?

sean