Existing download codepath acceleration

[jtolio]

Understanding we plan to do a larger download codepath refactor, there is a specific performance problem with the multicore servers in Durham right now, and so we want a small, targeted intervention to accelerate download speeds that reduce thrashing due to contention.

[iglesiasbrandon]

@jtolio is this ticket considered completed? Were we able to resolve the performance issues observed on the Durham setup? if so what was the solution?

[jtolio]

yes, and yes! we rewrote the part that manages concurrent piece downloads to be much faster.

[onionjake]

Do we have another ticket to enable this on edge?

[jtolio]

it's enabled!