From: Vivian Wang Date: Thu, 25 Jun 2026 06:34:15 +0000 (+0800) Subject: riscv: Raise default NR_CPUS for 64BIT to 256 X-Git-Tag: v7.2-rc2~12^2~8 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0fa749771993033befb9dda60b023782cb5fd2d9;p=thirdparty%2Fkernel%2Flinux.git riscv: Raise default NR_CPUS for 64BIT to 256 SpacemiT has already produced a 80-core RVA23 RISC-V server [1], and going further back, the dual-socket SG2042-based Sophgo Pisces has 128 cores (although that had some issues achieving mainline support). Therefore, an NR_CPUS of 64 is not enough. Raise default NR_CPUS to 256 for 64BIT (when !RISCV_SBI_V01, since very old firmware can't support more than 64 cores). The number was picked as a power of two that is at least double the known max. I believe this should be the right balance between not wasting too much memory and not having to touch this too often. Ubuntu has already been shipping NR_CPUS=512 for riscv64. We have also been testing NR_CPUS=256 internally at ISCAS and found negligible performance impact and no ill effects. Reported-by: Lufei Zheng Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1140651 # [1] Suggested-by: Han Gao Signed-off-by: Vivian Wang Link: https://patch.msgid.link/20260625-riscv-more-nr-cpus-v1-1-5da8c72b9269@iscas.ac.cn Signed-off-by: Paul Walmsley --- diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 3f0a647218e40..c0a6992933e41 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -454,7 +454,8 @@ config NR_CPUS range 2 32 if RISCV_SBI_V01 && 32BIT range 2 64 if RISCV_SBI_V01 && 64BIT default "32" if 32BIT - default "64" if 64BIT + default "64" if RISCV_SBI_V01 && 64BIT + default "256" if !RISCV_SBI_V01 && 64BIT config HOTPLUG_CPU bool "Support for hot-pluggable CPUs"