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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 55016C55191 for ; Fri, 24 Apr 2020 15:28:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3494A20700 for ; Fri, 24 Apr 2020 15:28:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="LPZP+4T/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727837AbgDXP2m (ORCPT ); Fri, 24 Apr 2020 11:28:42 -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...