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

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Message-ID: <20220902011634.6yfeujhzopepspm4@moria.home.lan>
Date:   Thu, 1 Sep 2022 21:16:34 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Roman Gushchin <roman.gushchin@...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>,
        Johannes Weiner <hannes@...xchg.org>, dave@...olabs.net,
        Matthew Wilcox <willy@...radead.org>, liam.howlett@...cle.com,
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        David Hildenbrand <david@...hat.com>, axboe@...nel.dk,
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        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications

On Thu, Sep 01, 2022 at 06:04:46PM -0700, Roman Gushchin wrote:
> 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).

Eh, I was hoping for better :)

> 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.

I'd be more interested in a synthetic benchmark, if you know of any.