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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Fiora Aeternal Suffering  🎃‏ @FioraAeterna 19 Jan 2016

      On the design of the SYSENTER Intel syscall instruction, and how the elegant idea fell apart https://groups.google.com/forum/m/#!topic/comp.arch/CjDs4MJCBow%5B1-25%5D …pic.twitter.com/VIZlsh87cE

      5 replies 21 retweets 33 likes
    2. Rich Felker‏ @RichFelker 19 Jan 2016
      Replying to @FioraAeterna

      @FioraAeterna Why does anyone care about SYSENTER being 2 vs 15 cycles when kernel entry/exit overhead is 500-1000 cycles? :-(

      1 reply 1 retweet 3 likes
    3. Fiora Aeternal Suffering  🎃‏ @FioraAeterna 19 Jan 2016
      Replying to @RichFelker

      @RichFelker because a lot of common syscalls, like say fetching time, require no security checks and can be done in a few cycles

      4 replies 0 retweets 0 likes
    4. Peter Barfuss 𒀱‏ @bofh453 19 Jan 2016
      Replying to @FioraAeterna

      @fioraaeterna @richfelker I don't really understand why on linux vdso gettimeofday() still requires a call when all it needs is a shmem read

      2 replies 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 19 Jan 2016
      Replying to @bofh453

      @bofh453 @FioraAeterna Because it has nanosecond resolution not shitty timer interrupt resolution like Windows.

      1 reply 0 retweets 0 likes
    6. Peter Barfuss 𒀱‏ @bofh453 19 Jan 2016
      Replying to @RichFelker

      @RichFelker @FioraAeterna clock_gettime(CLOCK_REALTIME) does, neither gettimeofday() nor time() do & the former is often sufficient.

      2 replies 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker 19 Jan 2016
      Replying to @bofh453

      @bofh453 @FioraAeterna Yes. gtod is only microsecond, but that's still A LOT HIGHER than timer interrupt (millisecond) resolution.

      1 reply 0 retweets 1 like
    8. Rich Felker‏ @RichFelker 19 Jan 2016
      Replying to @RichFelker

      @bofh453 @FioraAeterna The windows approach to providing current time is utterly broken for modern applications that need high res time.

      1 reply 0 retweets 1 like
    9. Peter Barfuss 𒀱‏ @bofh453 19 Jan 2016
      Replying to @RichFelker

      @richfelker @fioraaeterna oh I totally agree. see: the insane hacks of upping the timer interrupt res globally, & that's still not enough.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 19 Jan 2016
      Replying to @bofh453

      @bofh453 @FioraAeterna OTOH providing a function works. Mem stores last observed real time & rdtsc; func does rdtsc again & applies delta.

      12:42 PM - 19 Jan 2016
      1 reply 0 retweets 0 likes
        1. Peter Barfuss 𒀱‏ @bofh453 19 Jan 2016
          Replying to @RichFelker

          @richfelker @fioraaeterna yeah, this is what I do, but it only works when CONSTANT_TSC is true (which is more commonly the case nowadays).

          0 replies 0 retweets 0 likes
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