id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,launchpad_bug 1180,put more DYHBs into flight at once when K is larger,zooko,,"As mentioned in comment:8:ticket:448, the new downloader code in v1.8.0 will put at most 10 DYHBs into flight at once. This is perfect when {{{K=3}}}, but as {{{K}}} gets larger it is increasingly likely that the hardcoded limit of {{{10}}} will induce delay at the beginning of a download or cause the downloader to overlook a better-performing server. As Brian suggested on #448, a better limit would be something like {{{K * 3}}}. (Note: everyone that I know of uses the default settings of {{{K=3, M=10}}}. The theoretical maximum value of {{{K}}} is 256. Since nobody has tried it, we don't know if there are other problems with using {{{K}}} greater than about {{{100}}}.)",defect,new,major,soon,code-network,1.8β,,easy immutable download performance regression,,