From: Catalin Marinas <catalin.marinas@arm.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: patches@amperecomputing.com, Will Deacon <will@kernel.org>,
Vanshidhar Konda <vanshikonda@os.amperecomputing.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: Kconfig: Increase NR_CPUS default to 512
Date: Mon, 11 Jan 2021 18:25:27 +0000 [thread overview]
Message-ID: <20210111182526.GB17941@gaia> (raw)
In-Reply-To: <fb9542df-19cf-4db7-d112-0917e5b65e9f@infradead.org>
On Mon, Jan 11, 2021 at 10:03:18AM -0800, Randy Dunlap wrote:
> On 1/11/21 9:57 AM, Vanshidhar Konda wrote:
> > On Mon, Jan 11, 2021 at 10:56:36AM +0000, Will Deacon wrote:
> >> On Sat, Jan 09, 2021 at 09:36:15PM -0800, vanshikonda@os.amperecomputing.com wrote:
> >>> From: Vanshidhar Konda <vanshikonda@os.amperecomputing.com>
> >>>
> >>> 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.
--
Catalin
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next prev parent reply other threads:[~2021-01-11 18:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-10 5:36 [PATCH] arm64: Kconfig: Increase NR_CPUS default to 512 vanshikonda
2021-01-11 10:56 ` Will Deacon
2021-01-11 17:57 ` Vanshidhar Konda
2021-01-11 18:03 ` Randy Dunlap
2021-01-11 18:24 ` Vanshi Konda
2021-01-11 18:25 ` Catalin Marinas [this message]
2021-01-12 5:20 ` Vanshidhar Konda
2021-01-12 14:27 ` Will Deacon
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