From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A24FAC433DB for ; Mon, 11 Jan 2021 18:04:52 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5D44A20738 for ; Mon, 11 Jan 2021 18:04:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5D44A20738 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=6ag+32LBUiQuCiDtPd3ICfzS8VU137wUrwO+RySVyXs=; b=T15RAjH/5vATOOladrQMIQluC okO4zXyinl/CymP6rCeZl6UfczImBl1eMqsrKvXJb1Qlcu6VgYwrSDxOAqL64gZ9kW04a9TbsXDYh uCGbEd8XRW8OuGTsEGyDf+iHjzBORW8xQBIYiMQdQqt0nS9p3W2D9puDBH0Y8T6hFNqL5chga8W04 k6yOPIU24e71vtzkpvk8m7RQV2EOZFVeJLQp7PJfUa9+GKTo4rYqupAgdZa7O0P31UP2/vLSRfmoz PLPXuTqgKmA8+9tN+wpl/Lq4ZWNM4b1XghFdUSh88x/+avPmjgteE9d7VyUWKU5bVq7yiXCITw7/F L/QdBGgqQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kz1XM-0001cV-0h; Mon, 11 Jan 2021 18:03:28 +0000 Received: from [2601:1c0:6280:3f0::79df] by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kz1XH-0001b9-Rm; Mon, 11 Jan 2021 18:03:24 +0000 Subject: Re: [PATCH] arm64: Kconfig: Increase NR_CPUS default to 512 To: Vanshidhar Konda , Will Deacon References: <20210110053615.3594358-1-vanshikonda@os.amperecomputing.com> <20210111105636.GA7071@willie-the-truck> <20210111175741.ldifmv7uhdekbq5d@con01sys-r111.scc-lab.amperecomputing.com> From: Randy Dunlap Message-ID: Date: Mon, 11 Jan 2021 10:03:18 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <20210111175741.ldifmv7uhdekbq5d@con01sys-r111.scc-lab.amperecomputing.com> Content-Language: en-US X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: catalin.marinas@arm.com, patches@amperecomputing.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 >>> >>> 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. -- ~Randy _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel