linux-kernel - Re: [RFC PATCH 00/30] Code tagging framework and applications

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Message-ID: <YxFWrka+Wx0FfLXU@P9FQF9L96D.lan>
Date:   Thu, 1 Sep 2022 18:04:46 -0700
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     Kent Overstreet <kent.overstreet@...ux.dev>
Cc:     Yosry Ahmed <yosryahmed@...gle.com>,
        Michal Hocko <mhocko@...e.com>, Mel Gorman <mgorman@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
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Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications

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@google.com/

Maybe you can try to repeat this experiment.

Thanks!