[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

** Tags added: cscc -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346917 Title: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues To manage notifications

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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 >

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

** Changed in: linux (Ubuntu Trusty) Milestone: None => trusty-updates -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346917 Title: Using KSM on NUMA capable machines can cause KVM guest

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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: [Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu.

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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.

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu.

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

I am seeing the issue in 3.13.0-46-generic as well. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346917 Title: Using KSM on NUMA capable machines can cause KVM guest performance and stability

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

I am seeing the same issue in 3.13.0-46-generic hrtimer: interrupt took 4352551231 ns -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346917 Title: Using KSM on NUMA capable machines can cause KVM

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

** Branch linked: lp:ubuntu/precise-proposed/linux-lts-trusty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346917 Title: Using KSM on NUMA capable machines can cause KVM guest performance and

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

SRU Patch to Trusty (3.13) submitted to ubuntu-kernel-team ML. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346917 Title: Using KSM on NUMA capable machines can cause KVM guest performance and

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

https://lists.ubuntu.com/archives/kernel-team/2014-July/046805.html ** Changed in: linux (Ubuntu Trusty) Status: In Progress = Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu.

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

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

[Bug 1346917] Re: Using KSM on NUMA capable machines can cause KVM guest performance and stability issues

** Changed in: linux (Ubuntu) Importance: Undecided = High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346917 Title: Using KSM on NUMA capable machines can cause KVM guest performance and