I agree we should not change the behavior too much now that
FeatureFreeze is passed. Adjusting tasks in consequence.
** Changed in: qemu-kvm (Ubuntu Maverick)
Status: New = Won't Fix
** Changed in: qemu-kvm (Ubuntu)
Importance: Undecided = Wishlist
** Changed in: qemu-kvm (Ubuntu)
@Nullzone: that's some very good input, thanks. Looking at your
conclusions:
ksm is good but need some tweaks to doesnt become a problem more than a help
Right, if there is a saner default we should use it, and if there is no sane
default we should consider disabling it by default, with strong
Thanks for the info Nullzone! Based on your data, I'm going to spend a
bit of time running with:
# To disable qemu-kvm's page merging feature, set KSM_ENABLED=0 and
# sudo restart qemu-kvm
KSM_ENABLED=1
#SLEEP_MILLISECS=2000
SLEEP_MILLISECS=50
PAGES_TO_SCAN=100
Hello Thierry,
I will try to help showing some information gathered from my lab server as
you requested:
- Enviroment:
10 x Ubuntu 10.04 x86_64 with several services (SMTP, MySQL, Oracle, DB2,
TeamSpeak servers, Tomcats, bind ... etc).
1 x Windows 7 x86_64
3 x Debian Lenny x86_64
17% sounds a bit strong... I'd very much like to see a memory gain / CPU
usage chart for various values, or more discussion around the acceptable
value upstream. Any idea what the other qemu-kvm distributions are using
as a default ?
** Also affects: qemu-kvm (Ubuntu Maverick)
Importance:
This does seem to be a valid bug, some serious CPU time is being
dedicated to ksmd. Whilst I haven't seen it in Lucid, i have
experienced it in Maverick. Smoser witnessed ~17% CPU utilization for
ksmd.
Nominating for Maverick.
--
Lucid qemu-kvm: ksmd default config is CPU hog
As stated above, I personally don't plan on fixing it in Ubuntu.
You can set that value to whatever you want in the config file.
Dustin
--
Lucid qemu-kvm: ksmd default config is CPU hog
https://bugs.launchpad.net/bugs/578930
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Is this going to be fixed?
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Lucid qemu-kvm: ksmd default config is CPU hog
https://bugs.launchpad.net/bugs/578930
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Server Team, which is subscribed to qemu-kvm in ubuntu.
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Ubuntu-server-bugs mailing list
I don't think Won't Fix is appropriate. If you look at at
kernel/Documentation/vm/ksm.txt you find that the values for
pages_to_scan and sleep_millisecs are documentated as chosen for
demonstration purposes.
So upstream obviously does not consider these values appropriate for
normal operation.
See also https://bugzilla.redhat.com/show_bug.cgi?id=541230
** Bug watch added: Red Hat Bugzilla #541230
https://bugzilla.redhat.com/show_bug.cgi?id=541230
--
Lucid qemu-kvm: ksmd default config is CPU hog
https://bugs.launchpad.net/bugs/578930
You received this bug notification because you
Hi there-
You can actually set it to whatever you want, and have it persist across
boots. Just modify the values in the file /etc/default/qemu-kvm.
We're just using the default, upstream kernel value for
SLEEP_MILLISECONDS, which is 20. It does seem a bit aggressive, but
it's the upstream
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