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Sure. https://github.com/axboe/liburing/issues/189
Original claims were in the 90% and above performance increase over epoll. Then issues were found, and the figure was adjusted to 60% over epoll. Then more issues were found, and now real-world performance tests are showing minimal speedups if any.
Unfortunately the sibling commentors don't see "computer science" as a science but instead as a "feel good hobby", it seems. My point wasn't to hurt feelings, it was to provide a word of caution with these sorts of groundbreaking claims with respect specifically to the io_uring efforts, as they have been disingenuous quite a few times historically.
I don't doubt Jens does fantastic work. I don't doubt that he's seen these speedups in very specific cases. But people are celebrating this as a win where they'd be skeptical of e.g. "breakthrough" treatments of cancer (footnote: in mice). It's the same thing.
Why did you omit the response you received from a netty developer that showed a large performance improvement[1]? Focusing entirely on the few cases where people report regressions and ignoring all of the reports of improvements isn't a good way to make an objective assessment.
[1] https://github.com/netty/netty/issues/10622#issuecomment-701...