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fshttp: add DSCP support with --dscp for QoS with differentiated services

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Max Sum 2021-01-29 11:41:50 +08:00 • committed by Nick Craig-Wood
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@ -600,6 +600,21 @@ This flag can be useful for debugging and in exceptional circumstances
(e.g. Google Drive limiting the total volume of Server Side Copies to
100GB/day).
### --dscp VALUE ###
Specify a DSCP value or name to use in connections. This could help QoS
system to identify traffic class. BE, EF, DF, LE, CSx and AFxx are allowed.
See the description of [differentiated services](https://en.wikipedia.org/wiki/Differentiated_services) to get an idea of
this field. Setting this to 1 (LE) to identify the flow to SCAVENGER class
can avoid occupying too much bandwidth in a network with DiffServ support ([RFC 8622](https://tools.ietf.org/html/rfc8622)).
For example, if you configured QoS on router to handle LE properly. Running:
```
rclone copy --dscp LE from:/from to:/to
```
would make the priority lower than usual internet flows.
### -n, --dry-run ###
Do a trial run with no permanent changes. Use this to see what rclone