From owner-freebsd-stable@freebsd.org Sat Feb 17 20:19:39 2018 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E61B6F0B2DF for ; Sat, 17 Feb 2018 20:19:38 +0000 (UTC) (envelope-from matt.xtaz@gmail.com) Received: from mail-wr0-x22d.google.com (mail-wr0-x22d.google.com [IPv6:2a00:1450:400c:c0c::22d]) (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 56E3B6A4B2 for ; Sat, 17 Feb 2018 20:19:38 +0000 (UTC) (envelope-from matt.xtaz@gmail.com) Received: by mail-wr0-x22d.google.com with SMTP id k32so5998331wrk.4 for ; Sat, 17 Feb 2018 12:19:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mail-followup-to:references :mime-version:content-disposition:in-reply-to:user-agent; bh=OzZlipeulWFlwSsG40TUs6qslaxcjtP48yucm1FAF1c=; b=Mnoo9FHZKtyqpmO1+4mLC7HNh87ThMpprRSGe8pIiBcgv+zw0liDaSwbJwQ7mdzCld ZSX4UES+aIM2QPDXdERji8gjO5j/gUoyHVkgLIqgYRguzRAcPKddz+zp7HQ8JPzg7wPU gGD9WvsovmLamz+lrWrqi5r5k0YlNFl1PTVZMxpYM4m8ogT3IcgiM3uvFQPrHfC5FwQq 4NMhAhUR4L/tgbrJw1NxF37FW/sIFigW7YYwLBqW2KYyZBoC/zX8fXbi14yX5j5Pb2kk LYzaCFG+kssX99nhh94qgt4WN7A/XW0WfmJndR3s/E9WSda3JIqtjS+hGo38svVsHLLL hP7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id :mail-followup-to:references:mime-version:content-disposition :in-reply-to:user-agent; bh=OzZlipeulWFlwSsG40TUs6qslaxcjtP48yucm1FAF1c=; b=TGi1eiES4y6fE+WvzP/4Kfm7aEHqu9F+iAfgntiAZGXZXo29brbMJ4RZqYJXQFlWWk pS25uMUr7SMVuTb35m2OGOVN/9AJh5X8t0uTEcuomuNi3McWmKyMSB+7lMPndgEH64lA XnUFpU7t6UuCBSHHoVxw8zl4gtepd3n2qkTm9nhmL0PadgAGrLEH/F/NF2pwkSLc0fkj ajYYTw0e32+sMRZk9PxMAIgMyir5Gx8l31lCtSFwx9Ghzm/XSUEa3qjnoKj2MCOsltmq 05EW6ClSYLkG1g0SqdHiYJlHTb0UszaFzKQNb1srJgDBXI9V73ddgljM3zpQbzgRzTb1 t/Dw== X-Gm-Message-State: APf1xPCgY9DQvdLVgPYlrvh37E7HWVMVt32uhYY3Ur2gRTd+1eUGwKxz dKbbdtwfpn277jim5erduo/L5Ni8 X-Google-Smtp-Source: AH8x224cnj/W7ugHyaX4qlNaZ/4elt5pVVQtPGqiKUzZwZsb/6cUQGDSU1ec5D969nEyaM+jzkYiow== X-Received: by 10.223.168.111 with SMTP id l102mr9699447wrc.84.1518898777367; Sat, 17 Feb 2018 12:19:37 -0800 (PST) Received: from gmail.com (tao.xtaz.uk. [2001:8b0:fe33::10]) by smtp.gmail.com with ESMTPSA id m191sm16239176wma.42.2018.02.17.12.19.36 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 17 Feb 2018 12:19:37 -0800 (PST) Date: Sat, 17 Feb 2018 20:19:34 +0000 From: Matt Smith To: Jeremy Chadwick Cc: freebsd-stable@freebsd.org Subject: Re: stable/11 r329462 - Meltdown/Spectre MFC questions Message-ID: <20180217201934.GA51895@gmail.com> Mail-Followup-To: Matt Smith , Jeremy Chadwick , freebsd-stable@freebsd.org References: <20180217194726.GA79666@icarus.home.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20180217194726.GA79666@icarus.home.lan> User-Agent: Mutt/1.9.3 (2018-01-21) X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Feb 2018 20:19:39 -0000 On Feb 17 11:47, Jeremy Chadwick wrote: >Reference: https://svnweb.freebsd.org/base?view=revision&revision=329462 > >Do the following new loader tunables and sysctls have documentation >anywhere? I ask because I wish to know how to turn all of this off (yes >you heard me correctly), as not all systems necessarily require >mitigation of these flaws. > +1. I have an Intel Atom D525 "Pineview" which I'm led to believe doesn't have these flaws and therefore unless it's detected and disabled automatically I too would like to have documentation on how to view the current status, and disable it as required. And thank you for pointing this out. I can now just wait a while to see what comes along rather than accidentally upgrading it and killing the already really slow performance. -- Matt