From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C93D53C10A0; Fri, 11 Sep 2026 11:28:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789126153; cv=none; b=EwYrbwGMbCTigbYckgYyO4OW2KXdqZ+K3pJZjxIiBPUgDJt7MVnkB5w1V6pbR7iO1E4OdyDtXcO9xCgzjEUQhaM2ISPEnXMnJqOL24M+WAxrulFE9SvhKRWqKR2koEi9wVYxGeP/fOkNjvwDnDUKXFWhXvOUN4IwAWJXzhGO1tA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789126153; c=relaxed/simple; bh=XMxz3xWwdRk7Fg5cORCddjoeCBzF69+zQWbsu3cN3+Q=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=N9kham9cd21ryJ0Z5kbp27mzinT0xRW93AScn1EDUX0V2BDLD3PZkVoXwenRKMYtDVetBwBqjPQ8kmA1lcqExuorLy2Gj8jnuU6UGq730M+IKMjW/zk0WescWo9IkTnfoj7J/NOVr3Z+OvLG3QzNqxCX5PB94aYz2fh9XyG1UTM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XcaafniE; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XcaafniE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 41AB41F00893; Fri, 11 Sep 2026 11:28:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789126128; bh=TdwEh7wUoEZtB1Tewr8qRCnFQlC7xBSTZiMIf5U/rjY=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=XcaafniETDZ2wSKshYLr6RtM3Sy36Vvk9x/PRAb7U5Vsd5tHji8Y5MUvTIcmc6tXq 43fsW07NSMowcy2CrrI6dSrbNTz4TevR+A9k/LA5KmAmkrf8lxCwnKmxc/M+aNiWS4 2OxL8+5hczzpmlY07cIZ9csCmNw9hGd934G1GxWVY6Uc9NpWxYoM+y27Ufsh8MqTkS YHWkS9RKL7qg1Hfhlo3MZPpecwBlKy6O8hFerGRfFlGex5bH9O0EzMCuoBG5z+YTez JT7aoNeua+A+sFXxwhF2OKCeUdt2ixwEaGX96dYDlPPBkDkLgL9XEGI3L09PlHhW5Z 2hH322CB8yvTA== Date: Fri, 11 Sep 2026 12:28:34 +0100 From: "Lorenzo Stoakes (ARM)" To: Florian Fainelli Cc: Linus Torvalds , 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 , 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 Subject: Re: [PATCH 00/23] kbuild: significantly speed up kernel builds Message-ID: References: <20260908-build-speedup-v1-0-5dc1ac01672d@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Sep 09, 2026 at 02:58:59PM -0700, Florian Fainelli wrote: > On 9/8/26 13:55, Lorenzo Stoakes (ARM) wrote: > > A typical kernel build consists of a frustratingly large amount of time > > spent stuck in single-threaded bottlenecks. > > > > It turns out that there's a lot we can do about this and doing so > > significantly impacts kernel build times. > > > > This series makes allmodconfig builds up to 36% faster, incremental builds > > up to ~70% faster, and noop builds up to ~90% faster. > > > > Builds are faster across the board on every device I tested. > > > > Machines used for perf testing: > > > > * Threadripper - x86, AMD Threadripper 9980X, 64 cores, 128 threads > > * EPYC - x86, 2 socket EPYC 9754, 256 cores, 512 threads > > * M2 - arm64, 2022 M2 macbook pro, 8 cores, 8 threads > > (4 perf, 4 efficiency) > > My AMD EPYC 9454P server shows an improvement in the order of 13% using the > arm64's defconfig and make -j97. Thanks for doing this! Nice thanks! Good to confirm others are seeing the benefits :) > -- > Florian > -- Cheers, Lorenzo