We should consider applying these if we go with 3.2 for wheezy. (Or even if we don't.) Ben. -------- Forwarded Message -------- From: Mike McClurg <mike.mcclurg@citrix.com> To: Ubuntu Kernel Team <kernel-team@lists.ubuntu.com> Cc: Tim Gardner <timg@canonical.com>, #XenOrg <XenOrg@citrix.com>, Robbie Williamson <robbie.williamson@canonical.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Subject: Xen performance kernel patches backported to 3.2 for Precise Date: Wed, 30 Nov 2011 11:38:22 +0000 Hello Kernel Team, I have just created bug report #898112 [1]. This bug is related to a kernel issue which negatively affects Xen performance on Ubuntu 11.04 and later. This issue is caused by the kernel incorrectly reporting the cpufreq capabilities of the CPU to Xen, which prevents the hypervisor from setting the CPU to the maximum frequency scaling. A blog post describing the bug in detail can be found here [2]. The patch series, which has been backported to 3.2 (and I believe 3.0 as well) can be found here [3]. I ask the kernel team to consider including the 3.2 backport of this branch in the Precise kernel, and possibly the Oneiric kernel as well, if this is possible. Please feel free to contact me or Konrad (the patch author) with any questions. Thanks, Mike [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/898112 [2] http://blog.xen.org/index.php/2011/11/29/baremetal-vs-xen-vs-kvm-redux/ [3] http://git.kernel.org/?p=linux/kernel/git/konrad/xen.git;a=shortlog;h=refs/heads/devel/acpi-cpufreq.v4 -- kernel-team mailing list kernel-team@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kernel-team -- Ben Hutchings Computers are not intelligent. They only think they are.
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