kernel-packages team mailing list archive
-
kernel-packages team
-
Mailing list archive
-
Message #71481
Re: [Bug 1341195] Re: KVM guests getting slow by time
On 07/16/2014 09:39 PM, Serge Hallyn wrote
> I've personally not seen it, and noone on my team, who use a lot of
> kvm instances, has seen it. Our two current theories are that (a) it
> has to do with ksm page migration across numa-nodes, or (b) it has to
> do with a race with transparent hugepages versus ksm. For (b) there is
> already a commit in Linus' tree (f72e7dcd). For (a), you can probably
Are you referring to this or a different one?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1323165
> test by setting /sys/kernel/mm/ksm/merge_across_nodes to 0. (We are
> trying these as well, but as the testcases are not 100% positive
> it'd be good to have you try as well)
It's 1 now.
Do you you want me to set it now or wait to the result of KSM_ENABLED=0?
I'm not familiar enough with these settings.
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1341195
Title:
KVM guests getting slow by time
Status in “linux” package in Ubuntu:
Incomplete
Status in “qemu” package in Ubuntu:
Incomplete
Bug description:
There is a post with very similar symptoms on serverfault:
http://serverfault.com/questions/609881/windows-server-2012-on-kvm-on-
ubuntu-14-04-runs-well-for-a-while-and-then-slows/612084#612084
Basically all kind of KVM guests are getting slow by time, both windows or linux. The more running guests, it happens sooner.
Switching back to Saucy kernel is a good workaround.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: qemu-kvm 2.0.0+dfsg-2ubuntu1.1
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
Date: Sat Jul 12 22:18:49 2014
SourcePackage: qemu
UpgradeStatus: No upgrade log present (probably fresh install)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1341195/+subscriptions
Follow ups
References