[sldev] https very slow.

[Matthew Dowd]

> I don't think I've seen much more than 300KB/s normally, so that's about
> 3ms. For the viewer it's really insignificant.

The way https (and other PKI based encyption works), is that during the initial connect fairly compute intensive assymetric algorithms are used to securely exchange a randomly generated passphrase between client and server. Once this has been done, the actual data is encrypted with the pass phrase using a symmetric algorithm - a bit more sophisticate then XORing with the passphrase but more or less along the same principle and more or less with the same rather low impact on performance. So the real impact is if you are creating lots of small httsp connections. If you are creating a few https connections and sending repeated data down those, the impact is pretty negligible and other bottlenecks would be more likely to be the cause of performance issues.

 
> Of course it's a lot more significant for the sim, but the average
> amount of data being transferred should be well below 300 KB/s per
> agent.

The real impact on the server would be when there are mass simultaneous log ons creating https connections e.g. after grid downtime.

That said, most of the server class network cards have hardware support for encryption protocols so the server impact could be mitigated by that.

Matthew
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