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https://issues.apache.org/jira/browse/CLOUDSTACK-9004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14983619#comment-14983619
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ASF GitHub Bot commented on CLOUDSTACK-9004:
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Github user jharshman commented on the pull request:
https://github.com/apache/cloudstack/pull/1013#issuecomment-152675128
My apologies Daan,
I am happy to clarify.
The PR for this Jira ticket (9004), was created as a subtask of
CLOUDSTACK-8978. It's intent is to add the ability to set certain hv
parameters with an end goal in 8978 of implementing hyper-V enlightenment
features for Windows Server 2008 guests.
The current code for HyperVEnlightenmentFeatureDef only allowed the setting
of the hv_relaxed bit. This bit disables a windows sanity check that commonly
results in a BSOD when the VM is running on a host under heavy load.
The change here adds the ability to set the hv_vapic and hv_spinlocks bits
as well as retry time. The hv_vapic bit tries to reduce interrupt overhead in
guests. The hv_spinlock bit is used by the guest to notify the hypervisor that
the calling virtual processor is attempting to access a resource that may be
held by another virtual processor. For the host, the retry value for
hv_spinlock indicates the number of times the virtual processor should attempt
to access before the spinlock is considered excessive.
Basically these changes are setting the stage for changes I am going to
submit in CLOUDSTACK-8974.
> Add functionality to LibvirtVMDef.HyperVEnlightenmentFeatureDef
> ---------------------------------------------------------------
>
> Key: CLOUDSTACK-9004
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9004
> Project: CloudStack
> Issue Type: Sub-task
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: KVM
> Affects Versions: 4.5.2
> Reporter: Josh Harshman
> Priority: Minor
> Labels: easyfix, patch, perfomance, windows
>
> LibvirtVMDef.HyperVEnlightenmentFeatureDef only supports the setting of the
> relaxed mode feature. This change will expand the subclass to be able to set
> vapic and spinlock boolean values, as well as spinlock retry value.
> These values will then be written out to the XML appropriately.
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