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Comment by jdamato | Hacker News Reader

Author here, greetings. Anyone who finds this interesting may also enjoy our writeup describing every Linux system call method in detail [1].

[1]: https://blog.packagecloud.io/eng/2016/04/05/the-definitive-g...

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Nitpick - `77 percent faster` is not the inverse of `77 percent slower`. The line that says `The results of this microbenchmark show that the vDSO method is about 77% faster` should read `446% faster`.

Should that not be 346% faster? If A takes 1 second and B takes two seconds, then B is 100% faster than A. So the calculation would be (B/A - 1) * 100. Applying this here gives around 346%.

EDIT: B would, of course, take 100% longer than A, rather than be 100% faster.

How can something that takes twice as long be faster?

You're right, of course: hadn't had the morning coffee. It should have been 'takes 100% longer' in the 1 second/2 seconds example. The point I was trying to make is that you have to factor in the initial 100% which doesn't contribute to the final value.

Yes. Foot meet mouth. :)

I will def check that out. Anyone who find that interesting may also enjoy "The Linux Programming Interface" :D

Nitpick: slower _than_ what? It's implied, but "slower" (or "greater", or anything-er) is in relation to another thing.

This is rather out of date. Everything works quite similarly, but the kernel code is very different these days.

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