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Diffstat (limited to 'releasenotes')
| -rw-r--r-- | releasenotes/notes/update-initial-allocation-defaults-94106033b66b8fa0.yaml | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/releasenotes/notes/update-initial-allocation-defaults-94106033b66b8fa0.yaml b/releasenotes/notes/update-initial-allocation-defaults-94106033b66b8fa0.yaml new file mode 100644 index 0000000000..937c8d1c8a --- /dev/null +++ b/releasenotes/notes/update-initial-allocation-defaults-94106033b66b8fa0.yaml @@ -0,0 +1,21 @@ +--- +upgrade: + - | + In this release the default values for the initial ram and cpu allocation + ratios have been updated to 1.0 and 4.0 respectively. This will not + affect any existing compute node resource providers but the new default + will take effect on the creation of new resource providers. +other: + - | + The default initial allocation ratios enabled ram over commit by default + with a factor of ``1.5``. This value was chosen early in nova's history + as the predominant workload was web hosting or other light weight + virtualization. Similarly the default initial cpu allocation ratio + defaulted to 16. As more demanding workload from telco, enterprise, + scientific and governmental users became the norm the initial values we + had chosen became less and less correct overtime. These have now been + updated to reflect a more reasonable default for the majority of our users. + As of this release the initial ram allocation value is 1.0 disabling + overcommit by default for new compute nodes and the initial cpu allocation + ratio is now 4.0 which is a more reasonable overcommit for non idle + workloads. |