** Tags added: cscc
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https://bugs.launchpad.net/bugs/1346917
Title:
Using KSM on NUMA capable machines can cause KVM guest performance and
stability issues
To manage notifications ab
The guest used lots of memory on NUMA machine. Turned out KSM merged
some of the processes pages causing the particular processes to crawl.
Disabled KSM merge_across_nodes and it solved the problem:
echo 2 > /sys/kernel/mm/ksm/run && sleep 300 && cat
/sys/kernel/mm/ksm/pages_shared
echo 0 > /sys/
I am seeing this bug on a ubuntu 16.04 box running on proxmox 5.1.
Running 4.4.0-72-generic x86_64 guest (linux-image-4.4.0-72-generic).
Under heavy I/O sometimes the guest get stuck for couple of seconds and this
error is printed:
[538796.529342] hrtimer: interrupt took 37764682 ns
After that t
** Changed in: linux (Ubuntu Trusty)
Milestone: None => trusty-updates
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Title:
Using KSM on NUMA capable machines can cause KVM guest perform
Why not go with Linux 3.19 ?
You can just install it by running:
sudo apt-get install linux-generic-lts-vivid
It is by far, much more stable than Linux 3.13 (specially the network
stack)... ;-)
On 6 October 2015 at 11:36, Jim wrote:
> This is NOT fixed by 3.13.0-33.58. It continues to per
I think this is a different issue you're describing, connectivity
doesn't drop with this but it becomes very flakey, large latency spikes,
etc. It would never 100% drop
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This could be a different issue. For now can you file a new bug with additional
information?
Running: 'apport-bug linux' in a terminal would be best as it collects dmesg
output and package versions.
Any description or examples of how to reproduce would be very helpful in
tracking this down. Than
This is NOT fixed by 3.13.0-33.58. It continues to persist even with
3.13.0-65.106 (and 3.13.0-63.103).
I have around 10 VMs running but ONE in particular disconnects from the
network every hour or so.
I had this issue previously but it was initially gone on Ubuntu 14.04
LTS but had come back re
For those seeing this issue after 3.13.0-33.58, please ensure that the
virtual machine's host kernel is running 3.13.0-33.58 or newer. The VM
kernel itself does not matter.
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I am seeing the issue in 3.13.0-46-generic as well.
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https://bugs.launchpad.net/bugs/1346917
Title:
Using KSM on NUMA capable machines can cause KVM guest performance and
stability is
I am seeing the same issue in 3.13.0-46-generic
hrtimer: interrupt took 4352551231 ns
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Title:
Using KSM on NUMA capable machines can cause KVM g
I'm seeing the same issue on kernel: 3.13.0-40-generic. Per above
comment the bug is fixed in 3.13.0-33.58 but not included in the later
versions?
Dec 8 16:14:11 vm1 kernel: [ 109.084235] random: nonblocking pool is
initialized
Dec 8 16:49:40 vm1 kernel: [ 2237.458245] hrtimer: interrupt took
This bug was fixed in the package linux - 3.13.0-33.58
---
linux (3.13.0-33.58) trusty; urgency=low
[ Brad Figg ]
* Release Tracking Bug
- LP: #1349897
[ Upstream Kernel Changes ]
* mm: numa: do not automatically migrate KSM pages
- LP: #1346917
* net: fix UDP tun
** Branch linked: lp:ubuntu/precise-proposed/linux-lts-trusty
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Title:
Using KSM on NUMA capable machines can cause KVM guest performance and
st
https://lists.ubuntu.com/archives/kernel-team/2014-July/046805.html
** Changed in: linux (Ubuntu Trusty)
Status: In Progress => Fix Committed
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SRU Patch to Trusty (3.13) submitted to ubuntu-kernel-team ML.
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Title:
Using KSM on NUMA capable machines can cause KVM guest performance and
s
** Changed in: linux (Ubuntu)
Importance: Undecided => High
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Title:
Using KSM on NUMA capable machines can cause KVM guest performance and
s
A test build for this patch is provided here:
http://people.canonical.com/~arges/lp1346917/
For most servers
linux-image-3.13.0-33-generic_3.13.0-33.58~lp1346917v201407220903_amd64.deb
should be sufficient; however if you have DKMS packages you may need to install
linux-headers* packages. The l
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