*** This bug is a duplicate of bug 1346917 ***
https://bugs.launchpad.net/bugs/1346917
** This bug has been marked a duplicate of bug 1346917
Using KSM on NUMA capable machines can cause KVM guest performance and
stability issues
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After updating a server 12.04. LTS including the new HWE stack support I've got
the same problems.
The guest (MS Server 2012R2) was running after startup for about 7 to 10 min
without problems, after this period the cpu utilisation for the kvm process
increases more an more, the guest became
Hey guys!
I'm pretty sure that the following patch will fix your problems:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1346917
New kernel for Trusty: http://people.canonical.com/~arges/lp1346917/
My original BUG:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1338277
Cheers!
I have 5 KVM servers here all running 14.04 - 2 weeks ago one host
started to act up with VM's crashing - then this week another host was
suffering from terrible internal network delays (bridged NIC) -
rebooting the hosts and guests did nothing to resolve the issue -
disabling KSM seems to have
Was anyone able to test the fix proposed by Chris Arges in comment #12?
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https://bugs.launchpad.net/bugs/1341195
Title:
KVM guests getting slow by time
Status in “linux”
It was just a day ago.
I have to wait until the weekend, when the server becomes somewhat idle and I
can do such tests.
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https://bugs.launchpad.net/bugs/1341195
Title:
I believe I've found the fix for this issue for 3.13.
If you can, please test the kernel posted on comment #1 on this bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1346917
Make sure KSM is enabled; and any workarounds for this bug are disabled.
If this fixes the issue for you, you are
Marking incomplete until requested testing is complete.
** Changed in: linux (Ubuntu)
Importance: Undecided = High
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https://bugs.launchpad.net/bugs/1341195
Title:
KVM
** Tags added: ksm-numa-guest-perf
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Title:
KVM guests getting slow by time
Status in “linux” package in Ubuntu:
Incomplete
I think we can be sure, that KSM_ENABLED=0 definitely helps.
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https://bugs.launchpad.net/bugs/1341195
Title:
KVM guests getting slow by time
Status in “linux” package in
FYI, I see no issue since I set KSM_ENABLED=0 (1 day).
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https://bugs.launchpad.net/bugs/1341195
Title:
KVM guests getting slow by time
Status in “linux” package in
On 07/14/2014 05:13 PM, Serge Hallyn wrote:
Since switching to saucy kernel is a good workaround, marking this as
affecting the kernel.
Could you try disabling KSM and see if that avoids the issue?
I set KSM_ENABLED=0 in /etc/default/qemu-kvm and restarted the server.
Also today after 3
Hi Tamas,
To be clear, you have not yet gotten the bug since you've set
KSM_ENABLED to 0, or have you?
Interesting about the saucy kernel. Ideally we could reproduce this
reliably enough to really bisect.
I wonder if we can reproduce without qemu.
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On 07/16/2014 06:35 PM, Serge Hallyn wrote:
To be clear, you have not yet gotten the bug since you've set
KSM_ENABLED to 0, or have you?
I just did it, so no, not yet.
This happened by time:
Saucy (everything is fine) - Trusty (issue happened) - Trusty with
Saucy kernel 3 weeks ago (no
Quoting Tamas Papp (1341...@bugs.launchpad.net):
On 07/16/2014 06:35 PM, Serge Hallyn wrote:
To be clear, you have not yet gotten the bug since you've set
KSM_ENABLED to 0, or have you?
I just did it, so no, not yet.
This happened by time:
Saucy (everything is fine) - Trusty
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
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)
On 07/16/2014 10:24 PM, Serge Hallyn wrote:
(To be sure - /sys/kernel/mm/ksm/run is in fact set to 0 now right?)
Right.
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https://bugs.launchpad.net/bugs/1341195
Title:
Since switching to saucy kernel is a good workaround, marking this as
affecting the kernel.
Could you try disabling KSM and see if that avoids the issue?
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New = Incomplete
**
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