linux-kernel - Re: [PATCH] RISC-V: Increase range and default value of NR

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Message-ID: <f1079093-54db-bd20-3342-b06d069c5d1f@codethink.co.uk>
Date:   Fri, 18 Mar 2022 14:46:52 +0000
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Anup Patel <apatel@...tanamicro.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>
Cc:     Atish Patra <atishp@...shpatra.org>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RISC-V: Increase range and default value of NR_CPUS

On 17/03/2022 03:55, Anup Patel wrote:
> Currently, the range and default value of NR_CPUS is too restrictive
> for high-end RISC-V systems with large number of HARTs. The latest
> QEMU virt machine supports upto 512 CPUs so the current NR_CPUS is
> restrictive for QEMU as well. Other major architectures (such as
> ARM64, x86_64, MIPS, etc) have a much higher range and default
> value of NR_CPUS.

What's the memory overhead for increasing this?

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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