[PVE-User] The low network throughput obsered on Open vSwitch bridge.

Hongyi Zhao hongyi.zhao at gmail.com
Mon Mar 15 05:37:57 CET 2021


On Mon, Mar 15, 2021 at 12:00 PM Dmitry Petuhov <mityapetuhov at gmail.com> wrote:
>
> Hello.
>
> That's how TCP throughput mediation works. In basic case, you cannot
> canot fully saturate link by two opposite TCP connections regardless of
> using Open vSwitch.
>
> There's one dirty hack that can override this behavior: you could use
> qdisc on interface that prioritize packets that have ACK bit set over
> those that don't in same connection. It will saturate link, but may lead
> to other issues on certain types of traffic (because of packet
> reordering), so [almost] nobody use it in real life.
>
> Multiple parallel connections in same direction also saturate link more
> evenly.

Thanks a lot for your help and explanation. But I still can't
understand why the speed observed from pve (192.168.10.254) to another
physical machine (192.168.10.100) is always higher than that observed
in the reverse direction. Any hints for this phenomenon?

Regards
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao at gmail.com>
Theory and Simulation of Materials
Hebei Polytechnic University of Science and Technology engineering
NO. 552 North Gangtie Road, Xingtai, China



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