High-Performance Networking Programming in C
TCP has been a field of intense research for decades. It's an extremely complex protocol with a heavy responsibility on the Internet. We often forget that TCP is what holds the Internet together without collapse due to congestion. IP connects networks together, but TCP ensures that routers are not overloaded and that packets do not get lost.
Consequently, the impact of TCP on performance is higher than any other protocol today. It is no wonder that top-notch researchers have written several papers on the topic.
The Internet is anything but homogeneous. There is every possible physical layer of technology on which TCP/IP works today. But, TCP is not designed for working well through wireless networks. Even a high-latency satellite link questions some of TCP's assumptions on window size and round-trip time measurement.
And, TCP is not without its share of defects. The congestion control algorithms, such as slow start, congestion avoidance, fast retransmit, fast recovery and so on, sometimes fail. When this happens, it hurts your performance. Normally, three duplicate ACK packets are sufficient for triggering congestion control mechanisms. No matter what you do, these mechanisms can drastically decrease performance, especially if you have a very high-speed network.
But, all else being equal, the above techniques are few of the most useful methods for achieving good performance for your applications.
Gunning for very high performance is not something to be taken lightly. It's dependent on heuristics and empirical data as well as proven techniques. As I mentioned previously, it is an art best perfected by practice, and it's also an iterative process. However, once you get a feel for how things work, it will be smooth sailing. The moment you build a stable base for a fast client/server interaction like this, building powerful P2P frameworks on top is no great hassle.
Polipo User Manual: www.pps.jussieu.fr/~jch/software/polipo/manual
TCP Tuning and Network Troubleshooting: www.onlamp.com/pub/a/onlamp/2005/11/17/tcp_tuning.html
Wikipedia's Definition of Bandwidth: en.wikipedia.org/wiki/Bandwidth
Advanced Networking Techniques: beej.us/guide/bgnet/output/html/multipage/advanced.html
TCP and Congestion Control Slides: www.nishida.org/soi1/mgp00001.html
Girish Venkatachalam is an open-source hacker deeply interested in UNIX. In his free time, he likes to cook vegetarian dishes and actually eat them. He can be contacted at email@example.com.
- The Tiny Internet Project, Part I
- SUSECON 2016: Where Technology Reigns Supreme
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- Bitcoin on Amazon! Sort of...
- Free Today: September Issue of Linux Journal (Retail value: $5.99)
- Android Browser Security--What You Haven't Been Told
- Securing the Programmer
- The Many Paths to a Solution
- Machine Learning with Python
Pick up any e-commerce web or mobile app today, and you’ll be holding a mashup of interconnected applications and services from a variety of different providers. For instance, when you connect to Amazon’s e-commerce app, cookies, tags and pixels that are monitored by solutions like Exact Target, BazaarVoice, Bing, Shopzilla, Liveramp and Google Tag Manager track every action you take. You’re presented with special offers and coupons based on your viewing and buying patterns. If you find something you want for your birthday, a third party manages your wish list, which you can share through multiple social- media outlets or email to a friend. When you select something to buy, you find yourself presented with similar items as kind suggestions. And when you finally check out, you’re offered the ability to pay with promo codes, gifts cards, PayPal or a variety of credit cards.Get the Guide