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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 87E5EC7EE2E for ; Fri, 9 Jun 2023 13:05:34 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Qd1XY08VMz3fCq for ; Fri, 9 Jun 2023 23:05:33 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=ct18ILo6; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=2604:1380:4641:c500::1; helo=dfw.source.kernel.org; envelope-from=maz@kernel.org; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=ct18ILo6; dkim-atps=neutral Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Qd1WV5803z3f0c for ; Fri, 9 Jun 2023 23:04:38 +1000 (AEST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9A666657EA; Fri, 9 Jun 2023 13:04:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC01EC433EF; Fri, 9 Jun 2023 13:04:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686315874; bh=90rVHTRs/3F5on7zL7vvDRpDwafaR4yvoFsAW9sVsUU=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=ct18ILo60TPRsRZeRF0MA6HqVV541momQ/jF4nftPln9ac11WPptBUohnWBmUvWqE vnbarfiPcuydHingkmODEEfgyBqMNPOYeP2WxeWyeZBtXUQLPWlTQiK3YoRCoQuOkz ykp2yROWej+XaTRvcPNC1Mj4JCwFi/idPxZcvWKMzoJB4BmjIGu9z7nSlgQ6TTTjIl qP4PTzdDzoU3b8crpqEvZ0W3ktzTOLFYBKjsvJzANfoNoi8mgwX007iMF+sc9WNoo4 c5+GV/8GYH3NerKeEbysr3Xjw/+GD6dgRglU5pvXYup5qB/zjHokXJytURgg3jzfRS C5Xro19M414WQ== Received: from 152.5.30.93.rev.sfr.net ([93.30.5.152] helo=wait-a-minute.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1q7bn5-0045UR-GR; Fri, 09 Jun 2023 14:04:31 +0100 Date: Fri, 09 Jun 2023 14:04:27 +0100 Message-ID: <873530okh0.wl-maz@kernel.org> From: Marc Zyngier To: Yu Zhao Subject: Re: kvm/arm64: Spark benchmark In-Reply-To: <20230609005935.42390-1-yuzhao@google.com> References: <20230526234435.662652-1-yuzhao@google.com> <20230609005935.42390-1-yuzhao@google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/28.2 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 93.30.5.152 X-SA-Exim-Rcpt-To: yuzhao@google.com, akpm@linux-foundation.org, pbonzini@redhat.com, apopple@nvidia.com, anup@brainfault.org, bgardon@google.com, bp@alien8.de, catalin.marinas@arm.com, chao.p.peng@linux.intel.com, christophe.leroy@csgroup.eu, dave.hansen@linux.intel.com, farosas@linux.ibm.com, cuigaosheng1@huawei.com, gshan@redhat.com, hpa@zytor.com, mingo@redhat.com, james.morse@arm.com, Jason@zx2c4.com, jgg@ziepe.ca, corbet@lwn.net, mhiramat@kernel.org, mpe@ellerman.id.au, michael@michaellarabel.com, rppt@kernel.org, npiggin@gmail.com, oliver.upton@linux.dev, paulus@ozlabs.org, peterx@redhat.com, seanjc@google.com, rostedt@goodmis.org, suzuki.poulose@arm.com, tglx@linutronix.de, thuth@redhat.com, will@kernel.org, yuzenghui@huawei.com, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, linux-m m@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Jason A. Donenfeld" , x86@kernel.org, Gavin Shan , kvm@vger.kernel.org, linux-doc@vger.kernel.org, Catalin Marinas , Dave Hansen , Peter Xu , linux-mm@kvack.org, Ben Gardon , Chao Peng , Will Deacon , Gaosheng Cui , "H. Peter Anvin" , Jonathan Corbet , Alistair Popple , Jason Gunthorpe , Ingo Molnar , Zenghui Yu , linux-trace-kernel@vger.kernel.org, linux-mm@google.com, Thomas Huth , Suzuki K Poulose , Nicholas Piggin , Borislav Petkov , Steven Rostedt , kvmarm@lists.linux.dev, Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Fabiano Rosas , Michael Larabel , Sean Christopherson , linux-kernel@vger.kernel.org, Oliver Upton , James Morse , Masami Hiramatsu , Anup Patel , Paolo Bonzini , Andrew Morton , linuxppc-dev@lists.ozlabs.org, Mike Rapoport Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, 09 Jun 2023 01:59:35 +0100, Yu Zhao wrote: > > TLDR > ==== > Apache Spark spent 12% less time sorting four billion random integers twenty times (in ~4 hours) after this patchset [1]. Why are the 3 architectures you have considered being evaluated with 3 different benchmarks? I am not suspecting you to have cherry-picked the best results, but I'd really like to see a variety of benchmarks that exercise this stuff differently. Thanks, M. -- Without deviation from the norm, progress is not possible.