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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 81A90C982D0 for ; Thu, 17 Sep 2026 19:43:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=vXH9wjvFT/A9fDyczK1+52XKm2pYxTYfrGFqmdLS5Kc=; b=QalOYg0PkOScoI 6O2B6lNYR1lBP3RbUs1MQDIUfDEBpNusBYQHuFGwVpMIKP4DxHQYAy79z/5Z+93y5dijGg14yoMtT RSioIKP5vlbPtAl7/vjbM2BgMbu7iDTiuB7NzB4mLzYBsDwXRiEFzAtdMWYCmMu1H5MjfKbqdL9kK fMFggLQFr03/tfnJACU44tbYYSRFejZxc7CiLgTHnx2zACivR0Cunb90VWIDKAq7sfScwsCYtpCNz Gh2jkroj1r6vkDktOHEqumWbW14ZoYy2rrGyKBiOv7jbpzTpSyDwltBnV+fUWQymjAw2+qZ2b/X0Q 2JGR2XLi1F1BSre3I7dg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x7I0U-0000000CM61-3vh0; Thu, 17 Sep 2026 19:42:54 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x7I0T-0000000CM5g-0xus; Thu, 17 Sep 2026 19:42:53 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 4C94B400BB; Thu, 17 Sep 2026 19:42:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E94031F000FF; Thu, 17 Sep 2026 19:42:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789674172; bh=PkRN80BoSYgUIdgeE3XHmHynLUQObuBpZsM5VGJ/hZ8=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=QEAswLsJV5CT5idl2b0sxECKt4RBnyFOYUhJeV8VSDp7LPI5q2uG0MitNu8vlrrGj GgP3f04l+0g2WO7Dw5awGdDXIeJH1+hlD5eteCdUqsYsZsKEHJot2zsQGiqsRqy8QV SXyJCnsalvj1JC+2CD4Ia7CbcDMentUQTCRQPyjilTKQXjJF/n1wcyHIpueWwqegca iexi0eQKo1IVM6WiNYXwgSA66Y8LNUF1DQzWeuBGNKtPcG+iwHiFB2sW9lhh+LTGNT i3DhH67X4z6x+NB5d58jYolAijG3u4bGwKbJBQaaayCSIrgwL4431CwUsDA/CZgmNo sabJIf79IKUwQ== Date: Thu, 17 Sep 2026 20:42:36 +0100 From: "Lorenzo Stoakes (ARM)" To: Linus Torvalds Cc: Nathan Chancellor , Nicolas Schier , Nick Desaulniers , Bill Wendling , Justin Stitt , Masahiro Yamada , Alexey Gladkov , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Arnd Bergmann , Catalin Marinas , Will Deacon , Mark Rutland , Ard Biesheuvel , Ilias Apalodimas , Josh Poimboeuf , Peter Zijlstra , Miguel Ojeda , Boqun Feng , Gary Guo , =?utf-8?B?QmrDtnJu?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , Onur =?utf-8?B?w5Z6a2Fu?= , Jonathan Corbet , Randy Dunlap , Kees Cook , "Gustavo A. R. Silva" , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org, Jens Axboe , linux-hardening@vger.kernel.org Subject: Re: [PATCH v3 00/20] kbuild: significantly speed up kernel builds Message-ID: References: <20260917-build-speedup-v3-0-9ecf4163ff36@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Thu, Sep 17, 2026 at 06:36:18PM +0100, Lorenzo Stoakes (ARM) wrote: > On Thu, Sep 17, 2026 at 10:15:26AM -0700, Linus Torvalds wrote: > > On Thu, 17 Sept 2026 at 09:06, Lorenzo Stoakes (ARM) wrote: > > > > > > == defconfig FULL build == > > > > > > before after delta > > > ---------------------------------- > > > Threadripper, gcc 32.5s 26.3s -6.1s (-19%) > > > Threadripper, clang 34.5s 27.2s -7.3s (-21%) > > > EPYC, gcc 28.7s 20.6s -8.1s (-28%) > > > EPYC, clang 39.8s 32.2s -7.6s (-19%) > > > M2, gcc 519.3s 512.4s -6.9s (-1%) > > > M2, clang 634.5s 569.4s -65.1s (-10%) > > > > There's something odd going on with that M2 gcc build. Why is it such > > an odd duck? > > Ugh dear lord I think the LLM somehow corrupted the numbers... Let me > re-run those myself locally and come back with the actual times! OK numbers are in: M2, gcc 564.7s 512.1s -52.6s (-9%) M2, clang 615.1s 564.1s -51.0s (-8%) >From the v1: M2, gcc 564.0s 512.4s -51.6s (-9%) M2, clang 616.1s 569.4s -46.7s (-8%) (Tested as per the cover letter pre-reqs, i.e. applying dependent series first etc.) Not sure on the -5s delta on the clang build :) that might have been me being more disciplined this time to not use the laptop at the same time. But broadly in line with the original numbers. > > > > > Linus > > -- > Cheers, Lorenzo -- Cheers, Lorenzo _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv