[tor-bugs] #9664 [Tor]: Precompute ephemeral keypairs for ntor

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#9664: Precompute ephemeral keypairs for ntor
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 Reporter:  nickm                       |          Owner:
     Type:  enhancement                 |         Status:  new
 Priority:  normal                      |      Milestone:  Tor:
Component:  Tor                         |  0.2.5.x-final
 Keywords:  tor-relay ntor performance  |        Version:
Parent ID:  #9662                       |  Actual Points:
                                        |         Points:
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 In the ntor handshake, on the server side, we need to generate a new y,Y
 pair for every handshake.  But there's no reason this needs to happen on
 demand; instead, it could be lovely to do batches of them ahead of time,
 so that we can respond to requests faster.  This wouldn't lower our CPU
 requirements when we were under load, but it might help us with circuit
 creation latency under less-than-horrible loads.

 Before we go ahead and do this, it might be clever to verify that there
 are in fact times when cpuworkers are idle on busy servers.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9664>
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