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From: Kent Overstreet To: Roman Gushchin Cc: Yosry Ahmed , Michal Hocko , Mel Gorman , Peter Zijlstra , Suren Baghdasaryan , Andrew Morton , Vlastimil Babka , Johannes Weiner , dave@stgolabs.net, Matthew Wilcox , liam.howlett@oracle.com, void@manifault.com, juri.lelli@redhat.com, ldufour@linux.ibm.com, Peter Xu , David Hildenbrand , axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, changbin.du@intel.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, Steven Rostedt , bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, Christoph Lameter , Pekka Enberg , Joonsoo Kim , 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, Shakeel Butt , Muchun Song , arnd@arndb.de, jbaron@akamai.com, David Rientjes , minchan@google.com, kaleshsingh@google.com, kernel-team@android.com, Linux-MM , iommu@lists.linux.dev, kasan-dev@googlegroups.com, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, linux-modules@vger.kernel.org, Linux Kernel Mailing List Subject: Re: [RFC PATCH 00/30] Code tagging framework and applications Message-ID: <20220902011634.6yfeujhzopepspm4@moria.home.lan> References: <20220831084230.3ti3vitrzhzsu3fs@moria.home.lan> <20220831101948.f3etturccmp5ovkl@suse.de> <20220831190154.qdlsxfamans3ya5j@moria.home.lan> <20220901223720.e4gudprscjtwltif@moria.home.lan> <20220902001747.qqsv2lzkuycffuqe@moria.home.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1662081408; a=rsa-sha256; cv=none; b=MCqJPPyjclbInXmUJfbvW+B36wNFKILknap+NJ3b//5uCxa27IckBZJUSvrCQ/nBRsmkMT L/mYQf6AgM+uIkTrAWf1xq5KrI/OppKvA3tK9yLvYpg4ifkDutsrxNs2e/b13B0AJUBnUl vZZ8AuAA3GnloX45uj+r5mx4oO+F0B8= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=xsMsILmj; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf19.hostedemail.com: domain of kent.overstreet@linux.dev designates 91.121.223.63 as permitted sender) smtp.mailfrom=kent.overstreet@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1662081408; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=+xwXm91t+47a+o+KD4FaRYzGqxlSaFanxZJX5xkrYrg=; b=QcgHjpJF4s3Bb/ly0KFz6QcgKq8XFjI+6FOieAtOVmfmJrRtIm0ajV865YVj64Tn6auwMQ ZGD0SfWtpsJPQ/7atTVmrAKGHFSvbfwhCC7Xg4Hl7SsLcjFmyZCniGEY2XsWa2B15TcdH/ SMHSgNo23ctFhJWNxNPuyAumNGh3fqk= X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: A17331A0041 Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=xsMsILmj; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf19.hostedemail.com: domain of kent.overstreet@linux.dev designates 91.121.223.63 as permitted sender) smtp.mailfrom=kent.overstreet@linux.dev X-Rspam-User: X-Stat-Signature: bjoj3engapkwuynese1sisdm6cbnttgu X-HE-Tag: 1662081408-231779 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.