*** 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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Marking incomplete until requested testing is complete.
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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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
Rebooted into the old kernel and disabled KSM. Then ran apport-collect.
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https://bugs.launchpad.net/bugs/1344430
Title:
10-15% iowait on kvm instances on Ubuntu 14.04
Stat
apport information
** Description changed:
After upgrading from Ubuntu 12.04 to Ubuntu 14.04 we began seeing 10-15%
iowait on kvm guests. The guests had little to no load and yet the
shell was laggy and commands took forever to respond (assuming you could
even type them)
# uname -a
** Tags added: ksm-numa-guest-perf
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https://bugs.launchpad.net/bugs/1344430
Title:
10-15% iowait on kvm instances on Ubuntu 14.04
Status in “linux” package in Ubuntu:
Co
One thing we are looking at is potential issues with KSM and KVM. Can you try
disabling KSM and see if the results remain the same:
- edit /etc/default/qemu:
- change KSM_ENABLED to 0
- sudo service qemu restart
I would recommend doing this when your VMs are shutdown; and ensuring nothing
else i
Some things (like the hardware of the host) we get through apport-collect. It
would be good to get a better understanding of the guest usage. Like how many
guests, how much memory they get, how many vcpus. virtio disks and network and
how are the guests connected to the network (NAT bridge, tran
@william,
Yes, please boot into the broken kernel and run apport-collect 1344430.
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https://bugs.launchpad.net/bugs/1344430
Title:
10-15% iowait on kvm instances on Ubuntu
I can boot into the old kernel and run apport-collect if you need that
as well.
** Tags added: apport-collected
** Description changed:
After upgrading from Ubuntu 12.04 to Ubuntu 14.04 we began seeing 10-15%
iowait on kvm guests. The guests had little to no load and yet the
shell was lag
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