[tahoe-dev] [tahoe-lafs] #1180: put more DYHBs into flight at once when K is larger

tahoe-lafs trac at tahoe-lafs.org
Fri Oct 22 13:28:43 UTC 2010

#1180: put more DYHBs into flight at once when K is larger
     Reporter:  zooko         |       Owner:                                                
         Type:  defect        |      Status:  new                                           
     Priority:  major         |   Milestone:  soon                                          
    Component:  code-network  |     Version:  1.8β                                          
   Resolution:                |    Keywords:  easy immutable download performance regression
Launchpad Bug:                |  

Comment (by zooko):

 Hm, did I mark this as "regression" because this makes v1.8.0 perform
 noticeably worse than v1.7.1 for cases when {{{K >> 3}}}? Because that
 case is increasingly interesting to me nowadays since (as mentioned in
 [http://tahoe-lafs.org/pipermail/tahoe-dev/2010-September/005247.html this
 mail to tahoe-dev]), I think people should probably start setting {{{K}}}
 at least as large as the number of servers on their grid. Perhaps we
 should even make the default value of {{{K}}} be 30 in future releases of
 Tahoe-LAFS instead of 3, and make the default value of {{{M}}} be 100. Oh,
 but what would that mean for the default value of {{{H}}}?

 In any case, nobody to my knowledge has measured v1.8.0 to see if it
 actually performs worse than v1.7.1 does due to this issue about v1.8.0
 keeping at most 10 DYHB's in flight at once.

 It would be great if someone would benchmark larger {{{K}}}'s.

Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1180#comment:1>
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