[fedora-virt] how can i verify that HW extensions are being used?
Robert P. J. Day
rpjday at crashcourse.ca
Thu Apr 16 11:48:52 UTC 2009
apparently, i made one lame-brained move yesterday that almost
certainly caused my VM to run thigh-suckingly slowly. following the
linux KVM FAQ, i wanted to configure KVM so i could run it as a
non-root user. to that end, i
* created a "kvm" group,
* added my user account to the kvm group, and
* added the rules file /etc/udev/rules.d/60-kvm.rules:
KERNEL=="kvm", GROUP="kvm"
i re-initialized udev with:
# udevadm control --reload-rules (right?)
unloaded my kvm modules (kvm and kvm_amd), reloaded them and, sure
enough, my new /dev/kvm device file had a group affiliation of kvm.
excellent, i thought, and away i went ... with still painfully slow
performance, until i realized that i was still in my original desktop
session which *wasn't* considered part of the kvm group. so a quick
logout, log back in and things were much better.
*that's* the sort of thing i'm trying to document as i write all of
this up -- those slight oversights which no one bothers to mention
that eventually bite you in the butt. in any event, back to my
original question -- what could i have checked that would have told
me, no, you are *not* taking advantage of the AMD-V HW virt
extensions? after all, my modules were loaded, /dev/kvm existed, it
clearly had the right group, but (and correct me if i'm wrong) i was
obviously not getting the benefit of HVM because my desktop session
wasn't considered part of the "kvm" group.
thoughts?
rday
--
p.s. my plan is, starting from scratch, to document every step in
installing f11 x86_64 under f11 x86_64, and end up with a recipe that
just plain *works*. has this been done already? URL?
========================================================================
Robert P. J. Day Waterloo, Ontario, CANADA
Linux Consulting, Training and Annoying Kernel Pedantry.
Web page: http://crashcourse.ca
Linked In: http://www.linkedin.com/in/rpjday
Twitter: http://twitter.com/rpjday
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