Issued:
2010-11-10
Updated:
2010-11-10

RHBA-2010:0855 - qemu-kvm bug fix update

Synopsis

qemu-kvm bug fix update

Type/Severity

Bug Fix Advisory

Topic

Updated qemu-kvm packages that fix various bugs are now available for Red Hat Enterprise Linux 6.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. qemu-kvm is the user-space component for running virtual machines using KVM.

This update fixes the following bugs:

  • Prior to this update, virtio-net used a packet transmission algorithm that was using a timer to delay a transmission in an attempt to batch multiple packets together. However, this typically resulted in a higher latency. With this update, the default algorithm has been changed to use an asynchronous bottom half transmitter, improving the performance. (BZ#633963)

  • Due to error in the committed_memory() function, the ksmtuned service was unable to determine the correct amount of memory used by qemu-kvm processes when no such process existed. This has been fixed, the relevant part of the source code has been corrected to return 0 when no qemu-kvm process is found, and ksmtuned now works as expected. (BZ#634249)

  • Previously, attempting to commit a copy-on-write image to a raw backing disk image using the "quemu-img commit" command may have failed with the following error:

    qemu-img: Error while committing image

With this update, this error no longer occurs, and such images can now be committed as expected. (BZ#641835)

All users are advised to upgrade to these updated packages, which resolve these issues.

Solution

Before applying this update, make sure that all previously-released errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at This content is not included.https://access.redhat.com/kb/docs/DOC-11259

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for Scientific Computing6x86_64
Red Hat Enterprise Linux Workstation6x86_64
Red Hat Enterprise Linux Server6x86_64
Red Hat Enterprise Linux Server from RHUI6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension6x86_64
Red Hat Enterprise Linux Desktop6x86_64

Updated Packages

  • qemu-kvm-debuginfo-0.12.1.2-2.113.el6_0.3.x86_64.rpm
  • qemu-kvm-0.12.1.2-2.113.el6_0.3.x86_64.rpm
  • qemu-kvm-tools-0.12.1.2-2.113.el6_0.3.x86_64.rpm
  • qemu-img-0.12.1.2-2.113.el6_0.3.x86_64.rpm
  • qemu-kvm-0.12.1.2-2.113.el6_0.3.src.rpm

Fixes

CVEs

(none)

References

(none)

Additional information