On Thu, Sep 01, 2022 at 08:17:47PM -0400, Kent Overstreet wrote: > On Thu, Sep 01, 2022 at 03:53:57PM -0700, Roman Gushchin wrote: > > I'd suggest to run something like iperf on a fast hardware. And maybe some > > io_uring stuff too. These are two places which were historically most sensitive > > to the (kernel) memory accounting speed. > > I'm getting wildly inconsistent results with iperf. > > io_uring-echo-server and rust_echo_bench gets me: > Benchmarking: 127.0.0.1:12345 > 50 clients, running 512 bytes, 60 sec. > > Without alloc tagging: 120547 request/sec > With: 116748 request/sec > > https://github.com/frevib/io_uring-echo-server > https://github.com/haraldh/rust_echo_bench > > How's that look to you? Close enough? :) Yes, this looks good (a bit too good). I'm not that familiar with io_uring, Jens and Pavel should have a better idea what and how to run (I know they've workarounded the kernel memory accounting because of the performance in the past, this is why I suspect it might be an issue here as well). This is a recent optimization on the networking side: https://lore.kernel.org/linux-mm/20220825000506.239406-1-shakeelb@xxxxxxxxxx/ Maybe you can try to repeat this experiment. Thanks!
