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=-7.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 2C730C2BA83 for ; Wed, 12 Feb 2020 12:18:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE38920714 for ; Wed, 12 Feb 2020 12:18:38 +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="HGIeuuDQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727698AbgBLMSi (ORCPT ); Wed, 12 Feb 2020 07:18:38 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:59726 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726135AbgBLMSh (ORCPT ); Wed, 12 Feb 2020 07:18:37 -0500 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=ujAGIKaczDf4GpRvpuhiaw04QsP3EgOUQr2HoMyYUs4=; b=HGIeuuDQ7DAhrkXYZ2yXnwKGyf kdmdT4kF1CRPQy3QWtP5FPrZWsr8IpV2gbsh/XZ4oxoHAcOj4fMDjNev7xGuqOOlV/V0xlibqlfw3 F23PhxPuq3nssSNjQ/Vx1YFZ8c1s2ghAM9h2SAc4BAyGHm2I1ilnfMNgJ58AxJkSLE6lHqeNTnEBt 4UdkdefPj353RpZYPLaGFxP0UXXczhQX+Gao9kfNj5UgBZN5QKqqvfRgMC+0ea4w3zQ9N+rzga38r ToRm+imutApDZzhTlQV4X7VqBPfgnXaCUFg1SHD5gGjoiRMVoR//w1sY+EXn9p+Z8VITGrPv8Adtl CBrgv5tQ==; 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 1j1qyQ-0000Jq-1I; Wed, 12 Feb 2020 12:18:34 +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 D0E1B305803; Wed, 12 Feb 2020 13:16:41 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id C87072B3D2517; Wed, 12 Feb 2020 13:18:30 +0100 (CET) Date: Wed, 12 Feb 2020 13:18:30 +0100 From: Peter Zijlstra To: kernel test robot Cc: Kim Phillips , LKML , Linus Torvalds , lkp@lists.01.org Subject: Re: [perf/x86/amd] 471af006a7: will-it-scale.per_process_ops -7.6% regression Message-ID: <20200212121830.GR14897@hirez.programming.kicks-ass.net> References: <20200212113514.GT12867@shao2-debian> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200212113514.GT12867@shao2-debian> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Feb 12, 2020 at 07:35:14PM +0800, kernel test robot wrote: > Greeting, > > FYI, we noticed a -7.6% regression of will-it-scale.per_process_ops due to commit: > > > commit: 471af006a747f1c535c8a8c6c0973c320fe01b22 ("perf/x86/amd: Constrain Large Increment per Cycle events") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > in testcase: will-it-scale > on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 128G memory That commit only changes code relevant to AMD machines; give you have this result on an Intel machine makes me think the bisect is flawed.