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For RDMA transports, TOS is an extension of IB QoS to provide clients the ability to segregate traffic flows for different type of data. RDMA CM abstract it for ULPs using rdma_set_service_type(). Internally, each traffic flow is represented by a connection with all of its independent resources like that of a normal connection, and is differentiated by service type. In other words, there can be multiple qp connections between an IP pair and each supports a unique service type. One of the TOS usage is bandwidth management which allows setting bandwidth limits for QoS classes, e.g. 80% bandwidth to controllers at QoS class A and 20% to controllers at QoS class B. Note: In addition to the TOS configuration, QOS must be configured on the relevant HCA on the target (send RDMA commands) and initiator to effect the traffic. usage examples: nvme connect --tos=0 --transport=rdma --traddr=10.0.1.1 --nqn=test-nvme Signed-off-by: Israel Rukshin <israelr@mellanox.com> Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.