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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9FE8EC4332F for ; Fri, 25 Nov 2022 12:01:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229563AbiKYMBx (ORCPT ); Fri, 25 Nov 2022 07:01:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229462AbiKYMBw (ORCPT ); Fri, 25 Nov 2022 07:01:52 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 40FC62FC1A for ; Fri, 25 Nov 2022 04:01:51 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8EA452B; Fri, 25 Nov 2022 04:01:57 -0800 (PST) Received: from [10.57.5.149] (unknown [10.57.5.149]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9F6A83F73D; Fri, 25 Nov 2022 04:01:50 -0800 (PST) Message-ID: Date: Fri, 25 Nov 2022 12:01:49 +0000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2 Subject: Re: Available Arm CPUs with SPE Content-Language: en-US To: Marc Jorda References: <2695ecbe-816e-eab7-8da2-30e0f62ae926@bsc.es> From: James Clark Cc: "linux-perf-users@vger.kernel.org" In-Reply-To: <2695ecbe-816e-eab7-8da2-30e0f62ae926@bsc.es> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org On 25/11/2022 11:17, Marc Jorda wrote: > Hello, > > I am trying to know which currently available Arm CPUs implement the > Statistical Profiling Extension (SPE), does anyone know where can I find > such information? Hi Marc, Graviton 2s on AWS should have it and N1SDP has it. You will need a metal instance at the moment so that rules out Graviton 3. Make sure you read the kernel requirements section here [1] > > As far as I know, it is an optional extension in Armv8.2, but I don't > know if it is mandatory for newer versions. Is it correct to assume that > all Arm Neoverse CPUs have this extension? I'm not sure about this, as you say it's optional, but whether all current Neoverse CPUs have it or not I don't know. I found this here [2] if it helps: SPE is an optional Armv8-A architecture extension available since Armv8.2-A. Examples of infrastructure CPUs supporting SPE are Neoverse-E1, Neoverse N1 and Neoverse V1. Graviton 2 and Ampere Altra are examples of Neoverse-based processors > > Thank you very much, > Marc > [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/Documentation/perf-arm-spe.txt [2]: https://community.arm.com/arm-community-blogs/b/tools-software-ides-blog/posts/arm-allinea-studio-21-0