[tor-bugs] #7743 [Tor]: Avoid needless wasted space in cells

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#7743: Avoid needless wasted space in cells
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 Reporter:  nickm                                    |          Owner:  nickm             
     Type:  defect                                   |         Status:  needs_review      
 Priority:  critical                                 |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor                                      |        Version:                    
 Keywords:  backport-023 tor-relay regression bwbug  |         Parent:                    
   Points:                                           |   Actualpoints:                    
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Comment(by nickm):

 If that helps but not enough (bug7743_024_test is just bug7743_023_alt2
 merged onto master), there are more things we can try to do in order to
 improve cell performance, including:

  * Remove the loop from connection_handle_read_impl. It doesn't seem to do
 anything useful.
  * If, when setting avail_to_package, we find that it is more than
 RELAY_PAYLOAD_SIZE, round it down to the nearest RELAY_PAYLOAD_SIZE.
  * When reading, round at_most down to avail.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7743#comment:12>
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