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Old 11-30-2011, 10:38 AM
Mike McClurg
 
Default Xen performance kernel patches backported to 3.2 for Precise

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

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Old 11-30-2011, 12:45 PM
Stefan Bader
 
Default Xen performance kernel patches backported to 3.2 for Precise

On 30.11.2011 12:38, Mike McClurg wrote:
> 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

Hi Mike,

if Konrad would/will manage to upstream those changes into 3.2, those would be
picked up automatically. Just looking at the number of patches I would be quite
careful to pick them from a non-upstream branch, even more because those all
touch the acpi subsystem. And even being useful in Xen does not guarantee there
is no side effect.
I will look at them, but still would be careful and cannot make any promise
right now.

Thanks,
Stefan
>
>
> [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
>


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Old 11-30-2011, 02:56 PM
Joseph Salisbury
 
Default Xen performance kernel patches backported to 3.2 for Precise

On 11/30/2011 08:45 AM, Stefan Bader wrote:

On 30.11.2011 12:38, Mike McClurg wrote:

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


Hi Mike,

if Konrad would/will manage to upstream those changes into 3.2, those would be
picked up automatically. Just looking at the number of patches I would be quite
careful to pick them from a non-upstream branch, even more because those all
touch the acpi subsystem. And even being useful in Xen does not guarantee there
is no side effect.
I will look at them, but still would be careful and cannot make any promise
right now.

Thanks,
Stefan



[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






Bug opened for this request as well:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/898112

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Old 11-30-2011, 03:13 PM
Stefan Bader
 
Default Xen performance kernel patches backported to 3.2 for Precise

On 30.11.2011 12:38, Mike McClurg wrote:
> 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
>
Darn, why is reply-all sometimes the default and then again not...

> Hi Mike,
>
> if Konrad would/will manage to upstream those changes into 3.2, those would be
> picked up automatically. Just looking at the number of patches I would be quite
> careful to pick them from a non-upstream branch, even more because those all
> touch the acpi subsystem. And even being useful in Xen does not guarantee there
> is no side effect.
> I will look at them, but still would be careful and cannot make any promise
> right now.
>
> Thanks,
> Stefan


The set is changing a considerable amount of code (including the addition of xen
specific processor driver). I tried to find this being discussed on either the
xen or the acpi mailing list but at least I cannot find any of the patches on
any of those.

-Stefan

>
> [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
>


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Old 11-30-2011, 04:35 PM
Konrad Rzeszutek Wilk
 
Default Xen performance kernel patches backported to 3.2 for Precise

> > if Konrad would/will manage to upstream those changes into 3.2, those would be
> > picked up automatically. Just looking at the number of patches I would be quite
> > careful to pick them from a non-upstream branch, even more because those all
> > touch the acpi subsystem. And even being useful in Xen does not guarantee there
> > is no side effect.
> > I will look at them, but still would be careful and cannot make any promise
> > right now.
> >
> > Thanks,
> > Stefan
>
>
> The set is changing a considerable amount of code (including the addition of xen
> specific processor driver). I tried to find this being discussed on either the
> xen or the acpi mailing list but at least I cannot find any of the patches on
> any of those.

You are right. I forgot to post them :-( Posted them just now to get the
ball rolling. Thanks!

https://lkml.org/lkml/2011/11/30/245

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