<div dir="ltr">Hi, <div><br></div><div>Sorry for my slow replies. I was out of the office Thursday/Friday. Catching up on this thread now. </div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, May 18, 2013 at 7:47 AM, Gary Kotton <span dir="ltr"><<a href="mailto:gkotton@redhat.com" target="_blank">gkotton@redhat.com</a>></span> wrote:<br>
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On 05/16/2013 05:02 PM, Aaron Rosen wrote:
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<div class="gmail_quote">On Wed, May 15, 2013 at 10:59 PM,
Gary Kotton <span dir="ltr"><<a href="mailto:gkotton@redhat.com" target="_blank">gkotton@redhat.com</a>></span>
wrote:<br>
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<div> On 05/15/2013 10:53 PM, Aaron Rosen
wrote:
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<div>Hi, <br>
<br>
</div>
I created the following blueprint and wanted to
hear what the community though before starting
on it. <br>
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<div><br>
<a href="https://blueprints.launchpad.net/nova/+spec/nova-api-quantum-create-port" target="_blank">https://blueprints.launchpad.net/nova/+spec/nova-api-quantum-create-port</a><br>
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In the BP you wrote: "The only downside I see of moving
this logic into nova-api is that we would slow down the
response time from nova-api to provision instances."<br>
<br>
This can be addressed by nova prefetching quantum ports.
When nova needs a port is can be retrieved from a cached
pool. This may be a way of addressing this at a later
stage if the nova api is indeed a bottleneck when it
comes to the quantum interface (please note that this
currently happens on the compute node at the moment)<br>
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<div>If there are ports that are preallocated and cached in
a pool of available ports on the nova-api node this won't
work if running multiple nova-api nodes with a load
balancer in front. <br>
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Why? It is just an implementation detail. This information can be
maintained in the nova database.<div class="im"><br></div></div></blockquote><div style><div>Prefetching already created ports on the nova-api side will most likely be to slow to have any affect in the case when a user creates a port and then immediately boots an instance. The slowness I mentioned in the blueprint was about if we were to take the approach of having nova-api create the ports in quantum (in this case there would be nothing to prefetch). Also, using cached information for the creation of an instance in my opinion seems like it can be problematic. (Using cached info for getting ips on an instance though is a different story). </div>
<div><br></div></div><div style>Aaron</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000">
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<div bgcolor="#FFFFFF" text="#000000"> Thanks<br>
Gary<br>
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<div>Thanks, <br>
<br>
Aaron<br>
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