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