Re: [PATCH] arm64: Kconfig: Increase NR_CPUS default to 512
From: Will Deacon <will@kernel.org>
Date: 2021-01-12 14:27:52
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On Mon, Jan 11, 2021 at 09:20:03PM -0800, Vanshidhar Konda wrote:
On Mon, Jan 11, 2021 at 06:25:27PM +0000, Catalin Marinas wrote:quoted
On Mon, Jan 11, 2021 at 10:03:18AM -0800, Randy Dunlap wrote:quoted
On 1/11/21 9:57 AM, Vanshidhar Konda wrote:quoted
On Mon, Jan 11, 2021 at 10:56:36AM +0000, Will Deacon wrote:quoted
On Sat, Jan 09, 2021 at 09:36:15PM -0800, vanshikonda@os.amperecomputing.com wrote:quoted
From: Vanshidhar Konda <redacted> Increase the default value of NR_CPUS to 512 from 256. This will enable the defconfig kernel to support platforms that have upto 512 cores.Do we already support such a platform, and what is it? I'm fine with bumping. the number, it's just nice to be able to say specifically _why_ we're dong it.I'm not aware of any publicly available systems that run into the 256 core limitation. At Ampere we have internal systems that would benefit from this change as they support more than 256 cores.But what does that have to do with the default value? Do you expect to run defconfig kernels? I don't ever expect that.We still aim for the arm64 defconfig to run on all supported SoCs, even if not optimally. Distros indeed tweak the config to their needs.Would "all supported SoCs" mean only SoCs that are currently available publicly? Could we include support for SoCs/systems in development but to be available publicly in the next few years?
I don't really see the need to rush that into defconfig, so I'd prefer to make the update when something actually exists otherwise it's really hard to keep track of why we made the decision (especially as unreleased hardware is liable to change). Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel