id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	launchpad_bug
392	pipeline upload segments to make upload faster	warner	warner	"In ticket #252 we decided to reduce the max segment size from 1MiB to 128KiB. But this caused in-colo upload speed to drop by at least 50%.

We should see if we can pipeline two segments for upload, to get back the extra round-trip times that we lost with having more segments.

It's also possible that some of the slowdown is just from the extra overhead of computing more hashes, but I suspect the turnaround time more than overhead.

We need to do something similar for download too, since the download speed was reduced drastically by the segsize change too.
"	enhancement	closed	major	1.5.0	code-performance	1.0.0	fixed	speed