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

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#9664: Precompute ephemeral keypairs for ntor
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:
     Type:  enhancement                          |         Status:
 Priority:  Medium                               |  needs_revision
Component:  Tor                                  |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.8.x-final
 Keywords:  tor-relay, ntor, performance,        |        Version:  Tor:
  027-triaged-1-in                               |  0.2.7
Parent ID:  #9662                                |     Resolution:
  Sponsor:  SponsorU                             |  Actual Points:
                                                 |         Points:  medium
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Changes (by nickm):

 * status:  assigned => needs_revision
 * severity:   => Normal


Comment:

 I'm not sure about precomputation in general, but it's pretty easy to do
 for the create cell case.  I have a not-quite-complete branch in
 `pregen_curve25519` that might make it look worthwhile.

 Why is this branch incomplete?
    * It needs to start calling cpu_init() unconditionally, like #13737
 does.
    * It may break some tests.
    * Linking isn't quite right.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9664#comment:8>
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