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news: Xen: announce removal of hard-code scheduler weight

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Also describe a possible side-affect due to changes in the default
(unspecified) value from 1000 to 256.

Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
Jim Fehlig 2018-03-21 15:39:27 -06:00
parent 83edaf4435
commit b56db91bc3
1 changed files with 16 additions and 0 deletions
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docs/news.xml
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@ -66,6 +66,22 @@
If someone customizing IP address inside VM, it will be helpful.
</description>
</change>
<change>
<summary>
Xen: Remove hard-coded scheduler weight
</summary>
<description>
The libxl driver was accidentally hard-coding the per-domain
scheduler weight to 1000, silently ignoring any user-provided
<code>&lt;shares&gt;</code> in <code>&lt;cputune&gt;</code>. The
driver now honors <code>&lt;shares&gt;</code>, and defers setting
a default value to Xen. Note that the Xen default is 256, so any
domains started after this improvement will have one fourth the
shares of previously started domains. If all domains must have
equal CPU shares, administrators must manually set the weight of
previously started domains to 256, or restart them.
</description>
</change>
</section>
<section title="Bug fixes">
</section>