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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#) https://grpc.io/
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grpc/doc/qos-dscp.md

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# Quality of Service (QoS) using Differentiated services
Differentiated services or DiffServ is a mechanism for classifying network traffic and providing quality of service on IP networks.
DiffServ uses dedicated fields in the IP header for packet classification purposes.
By marking outgoing packets using a Differentiated Services Code Point (DSCP) the network can prioritize accordingly.
The DSCP value on outgoing packets is controlled by the following channel argument:
* **GRPC_ARG_DSCP**
* This channel argument accepts integer values 0 to 63. See [dscp-registry](https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml) for details.
* Default value is to use system default, i.e. not set.
* Only apply to POSIX systems.