Linux 3.14 Gets PIE
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Linus Torvalds, the creator of Linux, formally released the Linux 3.14 kernel March 30.
While Torvalds did not name the Linux kernel Pi, nor did he release the 3.14 kernel on Pi Day, there is in fact still PIE, or proportional integral controller enhanced, code within Linux 3.14.
With the new Linux 3.14 kernel, developers have also taken aim at solving a problem known as "buffer bloat."
"Buffer bloat is a phenomenon where excess buffers in the network cause high latency and jitter," Linux kernel developer Vijay Subramanian wrote in his kernel commit message. "As more and more interactive applications [e.g., voice over IP, real time video streaming and financial transactions] run in the Internet, high latency and jitter degrade application performance."
To solve the challenge of buffer bloat in the Linux kernel, the PIE code has been integrated to solve the problem. PIE was first proposed in an Internet Engineering Task Force (IETF) draft in June 2013.
"Simulation results, theoretical analysis and Linux test bed results have shown that PIE can ensure low latency and achieve high link utilization under various congestion situations," the IETF draft states.