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POLow Latency Networking Technqiues and Silver-Bullets
 

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    <p>After some basic googling of low-latency networking I've come up with the following list of things programmers and system designers should consider when embarking on low latency networking:</p> <ol> <li><p>The design of the hardware, systems and protocols have to be considered together</p></li> <li><p>Develop protocols using UDP instead of TCP and implement simple ack-nak, resend logic at the application level</p></li> <li><p>Reduce the number of context switches (preferably to zero) for the process or thread that consumes and packetizes data off the wire</p></li> <li><p>Use the best selector for the OS (select, kqueue, epoll etc)</p></li> <li><p>Use good quality NICs and Switches with large amounts of on-board buffer (fifo)</p></li> <li><p>Use multiple NICs, specifically for down-stream and up-stream data flows</p></li> <li><p>Reduce the number of IRQs being generated by other devices or software (in short remove them if they are not required) </p></li> <li><p>Reduce the usage of mutexes and conditions. Instead where possible use Lock-Free programming techniques. Make use of the architecture's CAS capabilities. (<em>Lock-Free containers</em>)</p></li> <li><p>Consider single threaded over multi-threaded designs - context switches are very expensive.</p></li> <li><p>Understand and properly utilize your architecture's cache system (L1/L2, RAM etc)</p></li> <li><p>Prefer complete control over memory management, rather than delegating to Garbage Collectors</p></li> <li><p>Use good quality cables, keep the cables as short as possible, reduce the number of twists and curls</p></li> </ol> <p><strong>My question:</strong> I was wondering what other things fellow SOers believe are important when embarking on low latency networking.</p> <p><em>Feel free to critique any of the above points</em></p>
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    1. COGreat question, but it's very subjective. Stack Overflow has a sister site for that called Programmers Stack Exchange. I've cast a vote to migrate this question there automatically. If four other people vote similarly, this URL will redirect to the question's new home.
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    2. CO@Lord: I wasn't aware of this other stack. Seems like a good suggestion.
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    3. COHow can network latency possibly count as Subjective? It's as objective and measurable as you can get.
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