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 97D16EE6457 for ; Fri, 15 Sep 2023 11:55:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234349AbjIOLzW (ORCPT ); Fri, 15 Sep 2023 07:55:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232836AbjIOLzU (ORCPT ); Fri, 15 Sep 2023 07:55:20 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5D5B41FE5 for ; Fri, 15 Sep 2023 04:55:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=/RxvKXw5LCvs9VzyQVNGEEv5eVMaMqXh7WPSl2/wUg4=; b=e3nCxingkDr8K6/H1VHAWzXzlA N1ADg4WS82N5F4O4Jqi/10Nru2fF01VPRfdp4DNHPt8SYhba2bRr+VHs9zL7QK8Dgv5qAMtqhnJbJ gSPBfTJHQzSofvjr2LkXnUWdpbViD0yt6yplGmRnN8s/SqqLYAwWNoyk14C92L4O1P6JuqD5sih/r 9tWIapQQsV0tKrz2kdKrhvT5X7t24XBrYcZbr8lfvFFBnsjlB8s+MSgrS1lWUM7O5lJXjoTlm3uMt HeGKr6RENc4uTUMO3kMVH4lOFmyjT16ygGPLz/NRSQSQEsRKpPY8OHEkSHN5TX4Nk4OSwp0e68AzX LpTHhCeg==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qh7P2-009WVN-L2; Fri, 15 Sep 2023 11:54:29 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 5068E3003F2; Fri, 15 Sep 2023 13:54:28 +0200 (CEST) Date: Fri, 15 Sep 2023 13:54:28 +0200 From: Peter Zijlstra To: K Prateek Nayak Cc: Arjan van de Ven , Thomas Gleixner , LKML , x86@kernel.org, Tom Lendacky , Andrew Cooper , Huang Rui , Juergen Gross , Dimitri Sivanich , Michael Kelley , Wei Liu , Pu Wen , Qiuxu Zhuo , Sohil Mehta , Gautham Shenoy Subject: Re: [patch V4 24/41] x86/cpu: Provide cpu_init/parse_topology() Message-ID: <20230915115428.GD6721@noisy.programming.kicks-ass.net> References: <20230814085006.593997112@linutronix.de> <20230814085113.471353147@linutronix.de> <934072fe-eca2-44df-94e7-9fed1dc8b502@amd.com> <87r0nn8ots.ffs@tglx> <4a4d5a89-b024-ea49-8740-1f3aef412c15@amd.com> <6f101718-7ee1-1c3d-3e0a-3aa708928ecd@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <6f101718-7ee1-1c3d-3e0a-3aa708928ecd@amd.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 29, 2023 at 08:46:14AM +0530, K Prateek Nayak wrote: > Hello Arjan, > > On 8/28/2023 8:04 PM, Arjan van de Ven wrote: > > On 8/28/2023 7:28 AM, K Prateek Nayak wrote: > >>>     - Are these really different between AMD and Intel or is this some > >>>       naming convention issue which needs to be resolved? > >>     They do have different characteristics since, on Sapphire > >>     Rapids, the LLC is at a socket boundary despite having multiple > >>     tiles. (Please correct me if I'm wrong, I'm going off of > >>     llc_id shared in this report by Qiuxu Zhuo - > >>     https://lore.kernel.org/all/20230809161219.83084-1-qiuxu.zhuo@intel.com/) > >> > > > > Sapphire reports itself as 1 tile though (since logically it is) as far as I know > > > > I believe there are some variants with multiple tiles, at least the > following press-release suggests that: > > https://www.intc.com/news-events/press-releases/detail/1598/intel-launches-4th-gen-xeon-scalable-processors-max-series > > specifically "... combining up to four Intel 7-built tiles on a single > package, connected using Intel EMIB ...". Perhaps the one from Qiuxu > Zhuo's report does not contain multiple tiles. I think what Arjan was saying that despite them being build using multipe physical tiles, they describe themselves, in the topology leave, as being a single tile.