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Currently, the hv_sock buffer size is static and can't scale to the bandwidth requirements of the application. This change allows the applications to influence the socket buffer sizes using the SO_SNDBUF and the SO_RCVBUF socket options. Few interesting points to note: 1. Since the VMBUS does not allow a resize operation of the ring size, the socket buffer size option should be set prior to establishing the connection for it to take effect. 2. Setting the socket option comes with the cost of that much memory being reserved/allocated by the kernel, for the lifetime of the connection. Perf data: Total Data Transfer: 1GB Single threaded reader/writer Results below are summarized over 10 iterations. Linux hvsocket writer + Windows hvsocket reader: |---------------------------------------------------------------------------------------------| |Packet size -> | 128B | 1KB | 4KB | 64KB | |---------------------------------------------------------------------------------------------| |SO_SNDBUF size | | Throughput in MB/s (min/max/avg/median): | | v | | |---------------------------------------------------------------------------------------------| | Default | 109/118/114/116 | 636/774/701/700 | 435/507/480/476 | 410/491/462/470 | | 16KB | 110/116/112/111 | 575/705/662/671 | 749/900/854/869 | 592/824/692/676 | | 32KB | 108/120/115/115 | 703/823/767/772 | 718/878/850/866 | 1593/2124/2000/2085 | | 64KB | 108/119/114/114 | 592/732/683/688 | 805/934/903/911 | 1784/1943/1862/1843 | |---------------------------------------------------------------------------------------------| Windows hvsocket writer + Linux hvsocket reader: |---------------------------------------------------------------------------------------------| |Packet size -> | 128B | 1KB | 4KB | 64KB | |---------------------------------------------------------------------------------------------| |SO_RCVBUF size | | Throughput in MB/s (min/max/avg/median): | | v | | |---------------------------------------------------------------------------------------------| | Default | 69/82/75/73 | 313/343/333/336 | 418/477/446/445 | 659/701/676/678 | | 16KB | 69/83/76/77 | 350/401/375/382 | 506/548/517/516 | 602/624/615/615 | | 32KB | 62/83/73/73 | 471/529/496/494 | 830/1046/935/939 | 944/1180/1070/1100 | | 64KB | 64/70/68/69 | 467/533/501/497 | 1260/1590/1430/1431 | 1605/1819/1670/1660 | |---------------------------------------------------------------------------------------------| Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com> Reviewed-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.