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Lawrence Brakmo says:
====================
Host Bandwidth Manager is a framework for limiting the bandwidth used
by v2 cgroups. It consists of 1 BPF helper, a sample BPF program to
limit egress bandwdith as well as a sample user program and script to
simplify HBM testing.
The sample HBM BPF program is not meant to be production quality, it is
provided as proof of concept. A lot more information, including sample
runs in some cases, are provided in the commit messages of the individual
patches.
A future patch will add support for reducing TCP's cwnd (we are evaluating
alternatives). Another patch will add support for fair queueing's Earliest
Departure Time. Until then, HBM is better suited for flows supporitng ECN.
In addition, A BPF program to limit ingress bandwidth will be provided in
an upcomming patchset.
Changes from v1 to v2:
* bpf_tcp_enter_cwr can only be called from a cgroup skb egress BPF
program (otherwise load or attach will fail) where we already hold
the sk lock. Also only applies for ESTABLISHED state.
* bpf_skb_ecn_set_ce uses INET_ECN_set_ce()
* bpf_tcp_check_probe_timer now uses tcp_reset_xmit_timer. Can only be
used by egress cgroup skb programs.
* removed load_cg_skb user program.
* nrm bpf egress program checks packet header in skb to determine
ECN value. Now also works for ECN enabled UDP packets.
Using ECN_ defines instead of integers.
* NRM script test program now uses bpftool instead of load_cg_skb
Changes from v2 to v3:
* Changed name from NRM (Network Resource Manager) to HBM (Host
Bandwdith Manager)
* The bpf helper to set ECN ce now checks that the header is writeable
* Removed helper bpf functions that modified TCP state due to a concern
about whether the socket is locked by the current thread.
====================
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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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.