[Neutron] Exception for backporting patch 95491
Hi, we'd like to have backported patch [1] and I'd like to ask for an exception because this patch introduces new config option for defining caching backend for metadata agent. By default, the cache is turned off therefore default behavior is not changed. Caching on metadata agent side offloads neutron-server and improves scalability. Thank you Kuba [1] https://review.openstack.org/#/c/95491/
Caching on metadata agent side offloads neutron-server and improves scalability.
Do you have any numbers with and without caching, to prove "The user visible benefit" criterion?
Added comment otherwise lgtm after you provide numbers and 2014.1.1 freeze is lifted - Neutron still has 96919 and 96920 in the queue. Cheers, Alan
On 06/06/2014 10:54 AM, Alan Pevec wrote:
Caching on metadata agent side offloads neutron-server and improves scalability.
Do you have any numbers with and without caching, to prove "The user visible benefit" criterion? These are the results when cache was tested:
We tested lunching 40 VMs simultaneously on a single compute node. - w/o the patch the CPU on the Neutron server machine went up to ~40% - with the there was a peak of ~25% The numbers are inaccurate but give us an indication there is an improvement.
Added comment otherwise lgtm after you provide numbers and 2014.1.1 freeze is lifted - Neutron still has 96919 and 96920 in the queue.
Added example of how to use caching backend. Thanks, Kuba
Cheers, Alan
participants (2)
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Alan Pevec
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Jakub Libosvar