Jens Axboe, the creator of io_uring and maintainer of the block subsystem in the Linux kernel, was able to increase the number of input/output operations per second (IOPS) by at least 6% (possibly more on full-featured Linux kernel configurations) in just 5 minutes of coding. The idea is to cache the current time request in the block subsystem, made during each input/output operation—since there is nothing in the block system that requires nanosecond accuracy. As Axboe notes, he regrets not doing this 5 years ago when the idea first occurred to him—because, as it turned out, the implementation took only 5 minutes.
Source: opennet.ru
