Quoting Tamas Papp (1341...@bugs.launchpad.net):
> 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
No, this commit is
commit f72e7dcdd25229446b102e587ef2f826f76bff28
Author: Hugh Dickins <hu...@google.com>
Date: Mon Jun 23 13:22:05 2014 -0700
mm: let mm_find_pmd fix buggy race with THP fault
which seems later than that bug.
> > 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?
Oh - I forgot you had KSM_ENABLED=0 :) there's no sense changing
merge_across_nodes in the meantime.
(To be sure - /sys/kernel/mm/ksm/run is in fact set to 0 now right?)
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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)
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