From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1693ACAC597 for ; Mon, 15 Sep 2025 12:13:28 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4FC388E000C; Mon, 15 Sep 2025 08:13:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4D27D8E0001; Mon, 15 Sep 2025 08:13:28 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 40F7A8E000C; Mon, 15 Sep 2025 08:13:28 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 2B6DD8E0001 for ; Mon, 15 Sep 2025 08:13:28 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id E92A6C063D for ; Mon, 15 Sep 2025 12:13:27 +0000 (UTC) X-FDA: 83891374854.14.9017E20 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf22.hostedemail.com (Postfix) with ESMTP id 20838C0008 for ; Mon, 15 Sep 2025 12:13:25 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=DSR2ZDJl; spf=pass (imf22.hostedemail.com: domain of "SRS0=PlEG=32=paulmck-ThinkPad-P17-Gen-1.home=paulmck@kernel.org" designates 172.234.252.31 as permitted sender) smtp.mailfrom="SRS0=PlEG=32=paulmck-ThinkPad-P17-Gen-1.home=paulmck@kernel.org"; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1757938406; h=from:from:sender:reply-to: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=1/Ynn5K83pq/rCejK3Ggq1eP+IahhjysoFQfO5bQyUY=; b=wugmxXCE5yaeSxJySe6tlPI3UunRKurHY2nl9nGkElD+RL+WavtYUHfvSnQttTWlwgtJ4A TC5w5+KdBunz7IcuSfFHgPMp83x85Euq4XpaoZRdOpUGI2/c1o/Lv6/ScoaF/eDBDt3bZH FHTPhSMRJCjcVw/mpj0fP4IZwrNUB08= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=DSR2ZDJl; spf=pass (imf22.hostedemail.com: domain of "SRS0=PlEG=32=paulmck-ThinkPad-P17-Gen-1.home=paulmck@kernel.org" designates 172.234.252.31 as permitted sender) smtp.mailfrom="SRS0=PlEG=32=paulmck-ThinkPad-P17-Gen-1.home=paulmck@kernel.org"; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1757938406; a=rsa-sha256; cv=none; b=iDY5wSynMYK8YaWxqIl2DhfkgR7ydaTIWEXS0SzY+VnMKPysycnUbdBRbeLtCmwFwmhmA9 dGKFsaZfr8CiOEDxQcQavwIUjTedz77sZ85ZfWhAytZIOoLuVuu8/Bu5V1ZxAxcodCCVkS OXkntfLKlVGcNVQUnKWMhCTylbla1HA= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id AE3D143C98; Mon, 15 Sep 2025 12:13:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8CE01C4CEF1; Mon, 15 Sep 2025 12:13:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757938404; bh=N+eJ0gU44hVx/MW9LCq46yXd5OHmuJCxQYNhv441Ql8=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=DSR2ZDJlBr3Wz4wRY+2/aAxWZSLSTpc8cbCBn919mwyiZSGq1+6EYpGqVA0cI+Kil TqjE5KE/mMgstLFFBbXddlGj4l6x0jJHRyg7M1GG3aIJRnoFBIhCV+nlrbeNcU+v5H WJA3Vxp4AgCNsADMhg5o0p3u0JmoXzKaC6NGkjJoj2nx5eBd5Vmc3Y8kRVw9DBEg5+ FXC/nHThtqA0WnchXGu1Nh4DWBTgIfu07n1mJBahrb5OVDx499jSGkLvm27bV03WcV TXciRp9D5W24P+w8Ecf/7m3/ImM/yiJbBKA35s/3Xj+Qom7LlmXT4X3NWdfqvQJc5i I5C8tnFC0At2w== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id C3D2ECE1105; Mon, 15 Sep 2025 05:13:23 -0700 (PDT) Date: Mon, 15 Sep 2025 05:13:23 -0700 From: "Paul E. McKenney" To: Jan Engelhardt Cc: Sudarsan Mahendran , vbabka@suse.cz, Liam.Howlett@oracle.com, cl@gentwo.org, harry.yoo@oracle.com, howlett@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, maple-tree@lists.infradead.org, rcu@vger.kernel.org, rientjes@google.com, roman.gushchin@linux.dev, surenb@google.com, urezki@gmail.com Subject: Re: Benchmarking [PATCH v5 00/14] SLUB percpu sheaves Message-ID: Reply-To: paulmck@kernel.org References: <20250723-slub-percpu-caches-v5-0-b792cd830f5d@suse.cz> <20250913000935.1021068-1-sudarsanm@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 20838C0008 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: t557dtfzq3oi4ib5y4eropfyypmcwg74 X-HE-Tag: 1757938405-393292 X-HE-Meta: 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 uSEFQllo 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 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: List-Subscribe: List-Unsubscribe: On Mon, Sep 15, 2025 at 09:51:25AM +0200, Jan Engelhardt wrote: > > On Saturday 2025-09-13 02:09, Sudarsan Mahendran wrote: > > > >Summary of the results: > > > >- Significant change (meaning >10% difference > > between base and experiment) on will-it-scale > > tests in AMD. > > > >Summary of AMD will-it-scale test changes: > > > >Number of runs : 15 > >Direction : + is good > > If STDDEV grows more than mean, there is more jitter, > which is not "good". This is true. On the other hand, the mean grew way more in absolute terms than did STDDEV. So might this be a reasonable tradeoff? Of course, if adjustments can be made to keep the increase in mean while keeping STDDEV low, that would of course be even better. Thanx, Paul > >| | MIN | MAX | MEAN | MEDIAN | STDDEV | > >|:-----------|:-----------|:-----------|:-----------|:-----------|:-----------| > >| brk1_8_processes > >| BASE | 7,667,220 | 7,705,767 | 7,682,782 | 7,676,211 | 12,733 | > >| TEST | 9,477,395 | 10,053,058 | 9,878,753 | 9,959,360 | 182,014 | > >| % | +23.61% | +30.46% | +28.58% | +29.74% | +1,329.46% | > > > >| mmap2_256_processes > >| BASE | 7,483,929 | 7,532,461 | 7,491,876 | 7,489,398 | 11,134 | > >| TEST | 11,580,023 | 16,508,551 | 15,337,145 | 15,943,608 | 1,489,489 | > >| % | +54.73% | +119.17% | +104.72% | +112.88% | +13,276.75%| >