ksm polling frequency far too aggressive

Bug #550985 reported by Dustin Kirkland  on 2010-03-29
This bug affects 1 person
Affects Status Importance Assigned to Milestone
qemu-kvm (Ubuntu)
Dustin Kirkland 

Bug Description

Binary package hint: qemu-kvm

The default kernel same-page merging (KSM) polling frequency is set to 20 milliseconds. This is far too frequent (in my opinion).

A separate task should be opened against the kernel to ensure that the upstream default is sane.

But for now, let's change this to 2000ms when enabling KSM in the qemu-kvm upstart job. Note that an admin will be able to configure this in /etc/default/qemu-kvm

Related branches

Changed in qemu-kvm (Ubuntu):
status: New → In Progress
assignee: nobody → Dustin Kirkland (kirkland)
importance: Undecided → Medium
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package qemu-kvm - 0.12.3+noroms-0ubuntu3

qemu-kvm (0.12.3+noroms-0ubuntu3) lucid; urgency=low

  * debian/qemu-kvm.default, debian/qemu-kvm.upstart:
    raise the default sleep between kernel same-page merging
    (KSM) from 20 milliseconds to 2000 milliseconds, LP: #550985
 -- Dustin Kirkland <email address hidden> Mon, 29 Mar 2010 11:35:44 -0500

Changed in qemu-kvm (Ubuntu):
status: In Progress → Fix Released
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