Received: by 2002:a25:1985:0:0:0:0:0 with SMTP id 127csp741052ybz; Fri, 24 Apr 2020 08:30:56 -0700 (PDT) X-Google-Smtp-Source: APiQypLeAMHklCPKN/qaQ44KgFWlLO7NfN/klMFUIBy+HkC/uaz7EmJlCXSrw/Pp9QCJfMnqE0lR X-Received: by 2002:a17:907:11de:: with SMTP id va30mr7713247ejb.121.1587742255863; Fri, 24 Apr 2020 08:30:55 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1587742255; cv=none; d=google.com; s=arc-20160816; b=dgWYwSJd1iPjhs0x5RJGIW/ioYfUUKd3OUytWWhV4AzE0qjg9/DCqfLmEAl/LPPRZD gor/5s9lEyquRheWt+8V0hQTbXrIS8cY7zjogkpOLU+YyPRibKO/5+RR8wa/1lbh8scx nRues2VSvTKg1CPy2F9dKqgLFN/58KZ8ym1CEULRjTrnmWs1fv5+Jlh+goqatXV7vL5v mCU9d1MTnryzxeflUAbU8qo2xueVwQXFchjAiWv8UAG4Q5SWSmqPchbr74vhgkDu06BI kf2e4rEOfdA3ZJr1zI2Ymv8sPaX3BUUdyL5nfIvIpsk0pWP1CaokA0HTTr9j1fkA115o B0Kw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:in-reply-to:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :dkim-signature; bh=lDf/A3ovuzNt2KEhRlfv8ja1JM5mX8+ysQPOwQf9ito=; b=FGx+03sGVo5TZnAhySsFm47BUKEhP4Kx4kWHXVKSbR9+/g8DsyrFurN4fYCD6xpGn/ a4LJJtd8O/fdFTUfIhVy0TjgxZyxf7FJV0GT6Z616+TjurN+I/ojCHUB/+wcYh9k49oE DozKkfr0hiZH6J39FQuz66GrEECdfgLIe2uQkgzS/cQaqdut8nt7XTjVzRb1cxYsrIkb 4VzhMo5gioIAd83OO75xOq+nN/GF18kMG0PJtCzOHRRnwBAgVSBUtJw+XaK25l7EWtso VlJGOdQRcD7O0vxJnTzxwfCRXLQyAtlL9HTz8qXMAr4hl7HYiYSGCkWw2zIEQ/zHyqen CPNw== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b="LPZP+4T/"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id a4si1181003edf.478.2020.04.24.08.30.32; Fri, 24 Apr 2020 08:30:55 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b="LPZP+4T/"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727819AbgDXP2l (ORCPT + 99 others); Fri, 24 Apr 2020 11:28:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727016AbgDXP2l (ORCPT ); Fri, 24 Apr 2020 11:28:41 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A96AC09B045 for ; Fri, 24 Apr 2020 08:28:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=lDf/A3ovuzNt2KEhRlfv8ja1JM5mX8+ysQPOwQf9ito=; b=LPZP+4T/v/UchGnKt5lr3AdAIk +PTe+BNwaHRkGqFMCxOhWOMOKERajrsCzk3Mz75ALxUvcGF25CAHZr9Fug/39kLumfHxfKcVmuVnW ghSezW7kAZI54iPFVVisYjuhdHNAZWccycCfH0ydk8HZFZEvoUExhhr4N4IgtV3t00wKNIEfV5+iw 5FPJvTTUUyREUGwUIoy27wv4bm8E1NbTw8nb9WcFKQOJJVZ7Z+hA+hvDimQ8mQ/qyKLZQ9RjZLSw/ GPvtrwo4WAsxLYJlbHEZyukiFtqBYiajv0nco2Mi3d8xk/YnNd+V4LgJ+0KlwlEdh4aAx5CQHxhqP T8dTMItg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jS0Fb-000131-D0; Fri, 24 Apr 2020 15:28:23 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id A311E3010C8; Fri, 24 Apr 2020 17:28:20 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 7D4EA2013C457; Fri, 24 Apr 2020 17:28:20 +0200 (CEST) Date: Fri, 24 Apr 2020 17:28:20 +0200 From: Peter Zijlstra To: Paul Menzel Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, LKML , Tom Lendacky Subject: Re: `calibrate_APIC_clock()` takes 100 ms on AMD systems Message-ID: <20200424152820.GA13558@hirez.programming.kicks-ass.net> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 24, 2020 at 04:59:21PM +0200, Paul Menzel wrote: > Do AMD devices feature an alternatives like for Intel? https://developer.amd.com/resources/developer-guides-manuals/ Let us know if you find something...