[tor-bugs] #15017 [Tor]: Experiment: does BIO_f_buffer help performance with read/write syscalls?

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#15017: Experiment: does BIO_f_buffer help performance with read/write syscalls?
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 Reporter:  nickm   |          Owner:
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:  Tor: 0.2.7.x-final
Component:  Tor     |        Version:
 Keywords:          |  Actual Points:
Parent ID:          |         Points:
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 dgoulet has found that openssl generates lots of small read and write
 syscalls. Maybe we'd do better to have openssl buffer stuff?

 BIO_f_buffer can supposedly help us here.  We could buffer reads, writes,
 or both.

 We should see whether this helps performance, whether it causes weird
 bugs, and so on.  We should also try to find out how much memory openssl
 allocates for this stuff, and take that into account for our OOM
 calculations.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15017>
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