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

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Message-ID: <3a41b9fc-05f1-3f56-ecd0-70b9a2912a31@kernel.dk>
Date:   Fri, 2 Sep 2022 06:02:12 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Roman Gushchin <roman.gushchin@...ux.dev>,
        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>,
        Johannes Weiner <hannes@...xchg.org>, dave@...olabs.net,
        Matthew Wilcox <willy@...radead.org>, liam.howlett@...cle.com,
        void@...ifault.com, juri.lelli@...hat.com, ldufour@...ux.ibm.com,
        Peter Xu <peterx@...hat.com>,
        David Hildenbrand <david@...hat.com>, mcgrof@...nel.org,
        masahiroy@...nel.org, nathan@...nel.org, changbin.du@...el.com,
        ytcoode@...il.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, Steven Rostedt <rostedt@...dmis.org>,
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        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
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        iommu@...ts.linux.dev, kasan-dev@...glegroups.com,
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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 9/1/22 7:04 PM, 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).
> 
> 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).

io_uring isn't alloc+free intensive on a per request basis anymore, it
would not be a good benchmark if the goal is to check for regressions in
that area.

-- 
Jens Axboe