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[2620:137:e000::1:20]) by mx.google.com with ESMTP id l1-20020a50cbc1000000b0042b61459524si2111217edi.569.2022.06.01.10.56.12; Wed, 01 Jun 2022 10:56:38 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=desiato.20200630 header.b=eD9Mg9yS; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345280AbiEaOpR (ORCPT + 99 others); Tue, 31 May 2022 10:45:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236138AbiEaOpP (ORCPT ); Tue, 31 May 2022 10:45:15 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 504AA655E; Tue, 31 May 2022 07:45:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=z4qdvj6k827PaJs2Jp8xMpkXGtZPqp3Y126ciDm2JAY=; b=eD9Mg9yS6Dh1kK1FvpyQGSH5Fg 7QTb1wtk4WUBt8U57dmT8eJkCcD9HDCyC5y1fgq0NdeqvIifCQ7XV3ooW17fziNctJLOsICFm2zWs nBeVGrbv9sV9HzSjiYHXj3VRhe7WlrZoxvokjUiknqn0kVs3rapRpbxlsAu/ujb1tpcLdyopdCFUX sIPl4FpGF1nS8qoY2UIAKaSD1ArKipkyzMAYINo+FfTWETwF8o37wtDeeyyFUmUjXKP/OS2z82gZl gTXi7I9j4I5mEtSzQTHWV74fjdU7YjokO96JQnmC7l4u37r6TsLy6/09bg7iS8rlzCCeA1UOk6DtF m7s2uQvQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nw36g-003Tdk-2F; Tue, 31 May 2022 14:44:27 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 3B7E03005B7; Tue, 31 May 2022 16:44:23 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 268B32097B44C; Tue, 31 May 2022 16:44:23 +0200 (CEST) Date: Tue, 31 May 2022 16:44:23 +0200 From: Peter Zijlstra To: Jack Allister Cc: bp@alien8.de, diapop@amazon.co.uk, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, metikaya@amazon.co.uk, mingo@redhat.com, pbonzini@redhat.com, rkrcmar@redhat.com, sean.j.christopherson@intel.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org Subject: Re: ...\n Message-ID: References: <20220531140236.1435-1-jalliste@amazon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220531140236.1435-1-jalliste@amazon.com> X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 31, 2022 at 02:02:36PM +0000, Jack Allister wrote: > The reasoning behind this is that you may want to run a guest at a > lower CPU frequency for the purposes of trying to match performance > parity between a host of an older CPU type to a newer faster one. That's quite ludicrus. Also, then it should be the host enforcing the cpufreq, not the guest.