From owner-svn-src-head@freebsd.org Tue Jan 31 03:38:11 2017 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 636E4C988A9; Tue, 31 Jan 2017 03:38:11 +0000 (UTC) (envelope-from cse.cem@gmail.com) Received: from mail-wm0-f67.google.com (mail-wm0-f67.google.com [74.125.82.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 040B8182D; Tue, 31 Jan 2017 03:38:10 +0000 (UTC) (envelope-from cse.cem@gmail.com) Received: by mail-wm0-f67.google.com with SMTP id v77so19912156wmv.0; Mon, 30 Jan 2017 19:38:10 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :from:date:message-id:subject:to:cc; bh=x44pXePbmpET/5/N/AuPgcLhsPCt2A8Si7tJECzcEfQ=; b=cAezAf2PbR3b/ANxBTL0OIcWzylKmFPp43G5l2glbfMymaSLLsb11rly4/WFCCe+53 6SxflLYadO9IiVMtGhlHqLTg2QwvU7tengwH/sv6vSUsuWurrqd8AOz1NkQcetUY44uz 7ky3j7j+kIf6Hib6+E2k/i2WEFWmPMSSrxgAYUGeQ4YHtgpzsUNFcu/XE9XAU+kzvIcO o9VIe6HQQBd+R+XwhIAjPwSvQGuWMKFmpis0DIZhjQN1x32H0tuDBh/9P/bFT/gXV21e QZslHZRcS2K17KquJKXLE75A6dQTqYX3TcNQT3OxK0LUzzvwnDDoL0qgGpDLN3FChhrq 3yZA== X-Gm-Message-State: AIkVDXJ03JRdiB3M8WJSZ72LXPHhXm5ZkAIRwK5opVpnuyeySq8vidE6TnKRG9AnoSxNHw== X-Received: by 10.223.134.104 with SMTP id 37mr20551901wrw.121.1485833538323; Mon, 30 Jan 2017 19:32:18 -0800 (PST) Received: from mail-wm0-f45.google.com (mail-wm0-f45.google.com. [74.125.82.45]) by smtp.gmail.com with ESMTPSA id g40sm25952432wrg.19.2017.01.30.19.32.18 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Jan 2017 19:32:18 -0800 (PST) Received: by mail-wm0-f45.google.com with SMTP id v77so74026038wmv.0; Mon, 30 Jan 2017 19:32:18 -0800 (PST) X-Received: by 10.28.155.5 with SMTP id d5mr16194449wme.85.1485833538113; Mon, 30 Jan 2017 19:32:18 -0800 (PST) MIME-Version: 1.0 Reply-To: cem@freebsd.org Received: by 10.194.22.42 with HTTP; Mon, 30 Jan 2017 19:32:17 -0800 (PST) In-Reply-To: <201701310326.v0V3QW30024375@repo.freebsd.org> References: <201701310326.v0V3QW30024375@repo.freebsd.org> From: Conrad Meyer Date: Mon, 30 Jan 2017 19:32:17 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: svn commit: r313006 - in head: sys/conf sys/libkern sys/libkern/x86 sys/sys tests/sys/kern To: svn-src-head@freebsd.org Cc: src-committers , svn-src-all@freebsd.org Content-Type: text/plain; charset=UTF-8 X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 31 Jan 2017 03:38:11 -0000 On Mon, Jan 30, 2017 at 7:26 PM, Conrad E. Meyer wrote: > (The CRC instruction takes 1 cycle but has 2-3 cycles of latency.) My mistake, it's not 2 anywhere. It's just 3 cycles on all workstation/server CPUs since Nehalem. Different on Atom chips and AMD. Best, Conrad