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Phoronix: IO_uring, Speculative Execution, Encode/Decode Benchmark

Submitted by Roy Schestowitz on Sunday 29th of September 2019 06:49:08 AM Filed under
Graphics/Benchmarks
Linux
  • IO_uring Is More Polished With Linux 5.4

    Added back during the Linux 5.1 cycle was IO_uring for fast and efficient I/O. This new interface allows for queue rings to be shared between the application and kernel to avoid excess copies and other efficiency improvements over the existing Linux AIO code. With Linux 5.4, IO_uring is in even better shape.

    In the months since IO_uring was merged to mainline, we've seen a ton of continued work on it including the likes of a 755x performance improvement. With Linux 5.4, it seems following extensive optimizations by Jens Axboe and others, it's in quite a polished shape.

  • It Turns Out CPU Speculative Execution Can Be Useful For Random Entropy / RNG

    While CPU speculative execution has caused a lot of frustrations over the past two years due to the likes of the Spectre vulnerabilities, it turns out CPU speculative execution can be exploited to be a viable source of random entropy for random number generators.

    Particularly on newer Intel/AMD CPU microarchitectures where speculative execution is much more advanced than hardware from years ago, it's been found that measuring the execution time of loops relying upon speculation is random enough to be a cheap and speedy source of entropy.

    [...]

    Linus Torvalds commented and he believes that this is not very reliable and a simple jitter entropy implementation. But he did post his own proof-of-concept code for improving the jitter entropy code based upon this.

  • Fresh Video Encode/Decode Benchmark Numbers For Xeon Platinum 8280 vs. EPYC 7742

    Given recent updates to the Intel Scalable Video Technology (SVT) open-source video encoders as well as other open-source video encoders/decoders, here is a fresh look at the performance of the AMD EPYC 7742 2P server against the Intel competition with the dual Xeon Platinum 8280.

»

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