[vox-tech] File Transfers slowing over time

[Ken Bloom]

Buffer Bloat? http://www.bufferbloat.net/projects/bloat/wiki/Introduction


On Tue, Jul 23, 2013 at 11:33 PM, Alex Mandel <tech_dev at wildintellect.com>wrote:

> Can someone explain why a large file transfer might slow over time
> between 2 machines on the same switch, or even over a local network.
>
> My coworkers and I have experienced this independently with Windows
> Copy, SCP, SFTP.
>
> Example, a file transfer starts at 40 M/s but eventually ends up in the
> 1-5 M/s speed range. Though I did trick it into parallel with lftp and
> managed to get a sustained 16 M/s (2-3 simultaneous connections).
>
> My only suspicion right now is encryption (maybe disk speed?), but I'm
> looking for ideas of things to explore to ensure better QoS. If you
> didn't pick up on it, this isn't a home network, it's university, and
> everything is Gigabit wired. File sizes are in the 1-200 GB range.
>
> Thanks,
> Alex
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