kvm suffering from dramatic performance regression
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
qemu (Ubuntu) |
Fix Released
|
Low
|
Unassigned |
Bug Description
The recent upgrade to kvm is slowing down kvm access considerably. It gives comparable performance to running kvm with no kernel modules, however I do have kvm and kvm_intel loaded.
I'm in the kvm group and am running kvm like this:
$ kvm -hda ubuntu_13.04.kvm -name "ubuntu_13.04.kvm" -m 512 -net user -net nic -redir tcp:11601::22 -serial file:/tmp/kvm.log
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: qemu-kvm 1.3.0+dfsg-
ProcVersionSign
Uname: Linux 3.8.0-1-generic i686
NonfreeKernelMo
ApportVersion: 2.8-0ubuntu2
Architecture: i386
Date: Mon Jan 21 17:01:25 2013
InstallationDate: Installed on 2010-10-21 (823 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_
LANG=fr_CA.UTF8
SHELL=/bin/bash
SourcePackage: qemu
UpgradeStatus: Upgraded to raring on 2012-12-20 (32 days ago)
Changed in qemu (Ubuntu): | |
status: | Confirmed → Fix Released |
Manually removing the kernel modules and re-loading shows the following in dmesg:
[32444.994884] kvm: VM_EXIT_ LOAD_IA32_ PERF_GLOBAL_ CTRL does not work properly. Using workaround