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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 A4BB6C433E0 for ; Wed, 10 Mar 2021 01:39:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73C30650F2 for ; Wed, 10 Mar 2021 01:39:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231590AbhCJBis (ORCPT ); Tue, 9 Mar 2021 20:38:48 -0500 Received: from terminus.zytor.com ([198.137.202.136]:33307 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231174AbhCJBiU (ORCPT ); Tue, 9 Mar 2021 20:38:20 -0500 X-Greylist: delayed 3828 seconds by postgrey-1.27 at vger.kernel.org; Tue, 09 Mar 2021 20:38:20 EST Received: from wld181.hos.anvin.org ([73.241.8.88]) (authenticated bits=0) by mail.zytor.com (8.16.1/8.15.2) with ESMTPSA id 12A0XnbN592126 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NO); Tue, 9 Mar 2021 16:33:51 -0800 DKIM-Filter: OpenDKIM Filter v2.11.0 mail.zytor.com 12A0XnbN592126 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2021022501; t=1615336432; bh=MzuFaeZu6QRPAlMI4iKJwuvy4eL8SE2fjzwpcBF6Ev0=; h=Date:In-Reply-To:References:Subject:To:CC:From:From; b=fptORvHHK2qftaFAC/79iYgavjjVn/3+WMnLGW/MfI8p+sCzejAu0ZqMLW6dwihfQ FlLOF6fokj2NkqmmApIc7fnt7Ncw92vq8D7YoEGa2HIH8VXondRgTy4kXWd5QeIDdu FyPXWoi/4FqDF5gDDra/ewoqtwpyIlxf1jvrYE5/H6rYVpZhzA6pJcatnrh07XXMTM uRPbQCgsZDwHd4j+2IIPPaJUQQHCViTvugj/T7NBtCW3Bc6Byv320GzzTBpmuD8vwq 93wmHC+0Vd/kK7Xvhrrzocm9NlckAS1y0ZvjleOSzzVyqlaqDLyjSUbjLUadk57xQv uvi0+YVtq02rA== Date: Tue, 09 Mar 2021 16:33:45 -0800 User-Agent: K-9 Mail for Android In-Reply-To: References: <20210309120519.7c6bbb97@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: The killing of ideal_nops[] To: Peter Zijlstra , Steven Rostedt CC: x86@kernel.org, linux-kernel@vger.kernel.org From: hpa@zytor.com Message-ID: <362BD2A4-016D-4F6B-8974-92C84DC0DDB4@zytor.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On March 9, 2021 1:24:44 PM PST, Peter Zijlstra wr= ote: >On Tue, Mar 09, 2021 at 12:05:19PM -0500, Steven Rostedt wrote: >> On Tue, 9 Mar 2021 17:58:17 +0100 >> Peter Zijlstra wrote: >>=20 >> > Hi, >> >=20 >> > AFAICT everything made in the past 10 years ends up using p6_nops=2E >Is it >> > time to kill off ideal_nops[] and simplify life? >> >=20 >>=20 >> Well, the one bug that was reported recently was due to a box that >uses a >> different "ideal_nops" than p6_nops=2E Perhaps we should ask him if >there's >> any noticeable difference between using p6_nops for every function >than the >> ideal_nops that as found for that box=2E > >If the machine is more than a decade old, I'm not really caring about >optimal performance=2E If it is 32bit, I really couldn't be arsed as long >as it boots=2E p6_nops don't boot on all 32-bit chips=2E --=20 Sent from my Android device with K-9 Mail=2E Please excuse my brevity=2E