Open Stack

On Mon, Jan 6, 2014 at 8:38 AM, Jay Pipes <jaypipes at gmail.com> wrote:

> On Mon, 2014-01-06 at 17:04 +0100, Salvatore Orlando wrote:
> > I have already discussed the matter with Jay on IRC, even if for a
> > different issue.
> > In this specific case 'batching' will have the benefit of reducing the
> > rootwrap overhead.
>
> Right.
>
> > However, it seems the benefit from batching is not resolutive. I admit
> > I have not run tests in the gate with batching; I've just tested in an
> > environment without significant load, obtaining a performance increase
> > of less than 10%.
>
> Well, 10% is 10% better than nothing ;) And add in the (significant)
> rootwrap costs, and I think it's certainly worth looking into.
>


Have you tried running neutron without rootwrap, to get a baseline?




>
> > From what I gathered even if commands are 'batched' to ovs-vsctl,
> > operations are still individually performed on the kernel module. I
> > did not investigate whether the cli commands sends a single or
> > multiple commands on the ovsdb interface.
> > Nevertheless, another thing to note is that it's not just ovs-vsctl
> > that becomes very slow, but also, and more often than that, ovs-ofctl,
> > for which there is no batching.
>
> Ah, I did not realize ovs-ofctl had no batch mode. That's a shame...
>
> > Summarising, I'm not opposed to batching for ovs-vsctl, and I would
> > definitely welcome it; I just don't think it will be the ultimate
> > solution.
>
> Yep, understood.
>
> Thanks!
> -jay
>
>
>
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