From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@kernel.org>
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 7CD14ECAAD8
	for <linux-kernel@archiver.kernel.org>; Fri, 16 Sep 2022 09:36:09 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S229966AbiIPJgG (ORCPT <rfc822;linux-kernel@archiver.kernel.org>);
        Fri, 16 Sep 2022 05:36:06 -0400
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43412 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S229831AbiIPJf7 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Fri, 16 Sep 2022 05:35:59 -0400
Received: from outbound-smtp06.blacknight.com (outbound-smtp06.blacknight.com [81.17.249.39])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EDA96AA353
        for <linux-kernel@vger.kernel.org>; Fri, 16 Sep 2022 02:35:55 -0700 (PDT)
Received: from mail.blacknight.com (pemlinmail01.blacknight.ie [81.17.254.10])
        by outbound-smtp06.blacknight.com (Postfix) with ESMTPS id 10540C2AF1
        for <linux-kernel@vger.kernel.org>; Fri, 16 Sep 2022 10:35:54 +0100 (IST)
Received: (qmail 18029 invoked from network); 16 Sep 2022 09:35:53 -0000
Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[84.203.198.246])
  by 81.17.254.9 with ESMTPSA (AES256-SHA encrypted, authenticated); 16 Sep 2022 09:35:53 -0000
Date:   Fri, 16 Sep 2022 10:35:48 +0100
From:   Mel Gorman <mgorman@techsingularity.net>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org,
        x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Josh Poimboeuf <jpoimboe@kernel.org>,
        Andrew Cooper <Andrew.Cooper3@citrix.com>,
        Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
        Johannes Wikner <kwikner@ethz.ch>,
        Alyssa Milburn <alyssa.milburn@linux.intel.com>,
        Jann Horn <jannh@google.com>, "H.J. Lu" <hjl.tools@gmail.com>,
        Joao Moreira <joao.moreira@intel.com>,
        Joseph Nuzman <joseph.nuzman@intel.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Juergen Gross <jgross@suse.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        K Prateek Nayak <kprateek.nayak@amd.com>,
        Eric Dumazet <edumazet@google.com>
Subject: Re: [PATCH v2 00/59] x86/retbleed: Call depth tracking mitigation
Message-ID: <20220916093548.p2n7fpz7orwp24lz@techsingularity.net>
References: <20220902130625.217071627@infradead.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-15
Content-Disposition: inline
In-Reply-To: <20220902130625.217071627@infradead.org>
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, Sep 02, 2022 at 03:06:25PM +0200, Peter Zijlstra wrote:
> Excerpts from IBRS vs stuff from Mel's testing:
> 

FWIW, I retested this version as there were slight changes and retbleed=stuff
on Skylake is still far faster than the default. The default performance
differences are mostly within the noise versus a vanilla 6.0-rc3 kernel.
Other generations of Intel machine showed mostly noise. Zen[1-3] showed
no significant difference (immune to retbleed but functional alignment or
percpu structure changes might have mattered). For the series;

Tested-by: Mel Gorman <mgorman@techsingularity.net>

-- 
Mel Gorman
SUSE Labs