[tahoe-lafs-trac-stream] [tahoe-lafs] #1456: High latency for 'tahoe get' if 'tahoe put' in parallel

[tahoe-lafs]

#1456: High latency for 'tahoe get' if 'tahoe put' in parallel
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     Reporter:  T_X      |      Owner:  T_X
         Type:  defect   |     Status:  new
     Priority:           |  Milestone:  undecided
  critical               |    Version:  1.8.2
    Component:  code     |   Keywords:  download upload latency performance
   Resolution:           |  gateway vm kvm vpn trickle
Launchpad Bug:           |
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Comment (by T_X):

 Short update: The cause of the delay has to be even before
 twisted/web/http.py's HTTPChannel's lineReceived. First added a 'print' at
 the beginning of tahoe-lafs's web/filenode.py's FileNodeHandler's
 render_GET, but both the 'print' in tahoe-lafs and in twisted still suffer
 from the long delay. The cause has to be somewhere even earlier.

 Reducing pipeline_size in immutable/layout.py to 1 did not help either.

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Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1456#comment:10>
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