Re: [PATCH 00/23] kbuild: significantly speed up kernel builds
From: Florian Fainelli <florian.fainelli@broadcom.com>
Date: 2026-09-09 21:59:15
Also in:
linux-arch, linux-doc, linux-efi, linux-kbuild, linux-riscv, lkml, llvm
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! -- Florian