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BRIAN_____'s profile
Brian Smith
Brian Smith
Brian Smith
@BRIAN_____

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Brian Smith

@BRIAN_____

Code farmer. Security, crypto, performance, networking, usability. Rust, C++, C, Haskell, DSLs, etc. *ring*, webpki, crypto-bench, mozilla::pkix.

Honolulu & San Francisco
briansmith.org
Joined April 2008

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    1. Chris Evans‏ @scarybeasts 3 Sep 2017

      Chris Evans Retweeted Thomas Graf

      We tsk-tsked at Windows for putting font parsing in ring 0, but Linux is determined to try and catch up.https://twitter.com/tgraf__/status/904475786622640128 …

      Chris Evans added,

      Thomas Graf @tgraf__
      Linux 4.13 is out with in-kernel TLS support Graph: 99th centile latency - kTLS(green), OpenSSL (blue) Source: https://netdevconf.org/1.2/papers/ktls.pdf … pic.twitter.com/MlUFSDOjAB
      12 replies 107 retweets 149 likes
      Brian Smith‏ @BRIAN_____ 3 Sep 2017
      Replying to @scarybeasts

      There are definitely pros & cons here. On the con side, why not use a microkernel? On the pro side, it does seem more efficient & that wins.

      8:06 PM - 3 Sep 2017
      • 1 Like
      • Shiny Quagsire
      2 replies 0 retweets 1 like
        1. New conversation
        2. Chris Evans‏ @scarybeasts 3 Sep 2017
          Replying to @BRIAN_____

          Is there a fundamental reason that TLS in the kernel should be faster? Bad user-space libs? Torvalds getting soft in his old age?

          5 replies 1 retweet 5 likes
        3. CopperheadOS‏ @CopperheadOS 3 Sep 2017
          Replying to @scarybeasts @BRIAN_____

          AFAIK, Linus hasn't ever cared much about what gets done in optional kernel modules like this. It's core kernel code that he cares about.

          1 reply 0 retweets 2 likes
        4. CopperheadOS‏ @CopperheadOS 3 Sep 2017
          Replying to @CopperheadOS @scarybeasts @BRIAN_____

          It's 953 lines of code behind the CONFIG_TLS option. It sounded complex but barely registers as part of the complexity of the net subsystem.

          1 reply 0 retweets 3 likes
        5. CopperheadOS‏ @CopperheadOS 3 Sep 2017
          Replying to @CopperheadOS @scarybeasts @BRIAN_____

          https://github.com/torvalds/linux/commit/108ea51412a7fddcd0a39efe564dffd47a033e6c?diff=unified … is the whole thing. If you're not using it, net/tls code isn't added complexity since it's a self-contained module.

          1 reply 0 retweets 2 likes
        6. CopperheadOS‏ @CopperheadOS 3 Sep 2017
          Replying to @CopperheadOS @scarybeasts @BRIAN_____

          The changes to the core network code are very minimal. It's just hooked up to sendpages as an uninvasive data transformation plugin system.

          1 reply 0 retweets 2 likes
        7. Chris Evans‏ @scarybeasts 3 Sep 2017
          Replying to @CopperheadOS @BRIAN_____

          Understood. I think I just fondly remember the old days when the kernel was small and easy to reason about.

          3 replies 0 retweets 3 likes
        8. Brian Smith‏ @BRIAN_____ 3 Sep 2017
          Replying to @scarybeasts @CopperheadOS

          AFAICT, Linux has never been about minimalism. Illusions of minimalism in the past were probably actually just due to lack of resources.

          2 replies 1 retweet 4 likes
        9. Brian Smith‏ @BRIAN_____ 3 Sep 2017
          Replying to @BRIAN_____ @scarybeasts @CopperheadOS

          However, there is a possibility that userspace networking could beat this perfect-wise, though that may require userspace fs to do so.

          1 reply 0 retweets 0 likes
        10. 1 more reply
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 3 Sep 2017
          Replying to @BRIAN_____ @scarybeasts

          It's yet another optional kernel module. Not really a big deal because it's not like the userspace TLS implementations are going to go away.

          1 reply 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS 3 Sep 2017
          Replying to @CopperheadOS @BRIAN_____ @scarybeasts

          Complexity in core kernel code (RCU, namespaces) impacts everyone. This is only a self-contained option. More comparable to adding drivers.

          0 replies 0 retweets 0 likes
        4. End of conversation

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