[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 ( to another
physical machine ( is always higher than that observed
in the reverse direction. Any hints for this phenomenon?

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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