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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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[core] Add a channel argument to set DSCP on streams (#28322) This adds a new channel argument `GRPC_ARG_DSCP` which allows users to create classified gRPC streams with a Differentiated Services Code Point (DSCP) marking on the IP frames. The channel argument is handled on both clients and servers, but currently only on posix based systems. Fixes #17225 **Background**: In addition to what is already described is #17225, when gRPC is used in telco systems there is often a need to classify streams of importance. There can be multiple hops between two endpoints (e.g. between 2 telecom operators) and some streams that are more important than others (e.g. emergency call related or similar). By marking the IP packets using DSCP the aware routers can make a sound decision of the prioritization. This PR propose to use DSCP as the configuration value since its common for both IPv4/IPv6, an alternative would be to use a config name that includes TOS and Traffic Class. There might be more needed regarding documentation and end2end testing, but there I need some advice. **References** https://datatracker.ietf.org/doc/html/rfc2474 https://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml <!-- Your pull request will be routed to the following person by default for triaging. If you know who should review your pull request, please remove the mentioning below. --> @yashykt
1 year ago
# 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.