From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 45F241382C5 for ; Thu, 4 Jan 2018 03:16:14 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id C6D94E085E; Thu, 4 Jan 2018 03:16:08 +0000 (UTC) Received: from mail-ot0-x232.google.com (mail-ot0-x232.google.com [IPv6:2607:f8b0:4003:c0f::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 609C8E07F1 for ; Thu, 4 Jan 2018 03:16:08 +0000 (UTC) Received: by mail-ot0-x232.google.com with SMTP id d2so265216oth.9 for ; Wed, 03 Jan 2018 19:16:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:from:date:message-id:subject:to; bh=5w/b+l8qa5Gxhu9tJ3OpVUDwxNrNQQ46bCvh0UpQU8o=; b=hHKoriLl9XFE1Kftm/xx173pskSjQqAYao++IjLdC3NkDtOu22i+WxH8cstKd+FDfa aOAqWa+D5f4wbfACuwfZKIAt9WWrJSjSKl9stsTWx+GxrPZ6BwZpf1fp8Oe/vj/RMCR2 dHvbSxFEdtIU0uDxQtnOE4fWnkQvdxqL2OFuxCahP6Cw+YWbjVwB3hc69OPFZ9VN+OAH QBj6f8Qpa4+2TiH0pg7WZSGtPK67m288XTf87w2noh+yzEfa6nPyPqXddaTYhyc5Xu4t p5qv7SDZARUiuaq169rpUb3zMU0e1IfvCUd0VlLhWcQ6Df0kVssxRZUlY9PQE16pKta1 wl6A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:from:date:message-id:subject :to; bh=5w/b+l8qa5Gxhu9tJ3OpVUDwxNrNQQ46bCvh0UpQU8o=; b=ulLSY0+zBGU7mEzEAUmzMwff/OU5Eqal60XCaTisVBxplx5e2F3Y/25wBQX7M0GahI sB3OVAtMgfDgRS+wx5LZ5PeVC4ubye9xxbV0aAJnNeyVIUSk334WamJBKIVRLy7qHI45 1DWMgNpE7AR2pF+t8+7mO23FVjt7eKDLYa7sJ16XHwGqR7fjO98gQuteuUjw+coB31hy +HRYXQmiC0a1qIBkGePC2gm4wxQoYoBe5qEkHelFXAswk6tg5qS8lIIdIVqZrBzHX9wl I3hXGxBpGUrKW2XsczpWF4TSbY1O2Pq9xGtG5+CcY+eDsq/7WdhBa6euleGAXSZ3LfWE KGww== X-Gm-Message-State: AKGB3mIf5xMfYjYvJ/VmXtXpcwK/EnfrdMXs56x1vhZymI87fIfFF57q EGSv8b16xXcxpkSXT+zQAi1CNh3WVlwafNiH+dQ4kA== X-Google-Smtp-Source: ACJfBovWNSRtz7VunEGdZ2NP2b2CLwMLE94zxzjP+lYt+s0Yw3T/0i2hUVDt8/RgereDiNyA8oHPD11MheE4Pjmdxnc= X-Received: by 10.157.52.241 with SMTP id t46mr1821436otd.18.1515035767170; Wed, 03 Jan 2018 19:16:07 -0800 (PST) Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Sender: nsane457@gmail.com Received: by 10.74.92.206 with HTTP; Wed, 3 Jan 2018 19:15:46 -0800 (PST) From: P Levine Date: Wed, 3 Jan 2018 22:15:46 -0500 X-Google-Sender-Auth: D6F-RzofSWmTen_CL7FMHrk8dFs Message-ID: Subject: [gentoo-user] Expect a ~15% average slowdown if you use an Intel processor To: gentoo-user@lists.gentoo.org Content-Type: multipart/alternative; boundary="001a113ecaeab96b440561eac06f" X-Archives-Salt: d64ca0f2-6de4-4222-888a-6e0dd63ce1bf X-Archives-Hash: fa27e206d47669eccd83b22c87e54203 --001a113ecaeab96b440561eac06f Content-Type: text/plain; charset="UTF-8" I'm not sure if it's been mentioned here before but there apparently is a bug affecting all Intel CPUs manufactured in the last 10 years or so, in which protected kernel memory is leaked to userspace. It can't be patched in microcode and will lead to some serious overhead to patch in the OS. See, Huge Intel CPU Bug Allegedly Causes Kernel Memory Vulnerability With Up To 30% Performance Hit In Windows And Linux and Meltdown and Spectre . Reported at Bug 643360 . --001a113ecaeab96b440561eac06f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I'm not sure if it's been mentioned here= before but there apparently is a bug affecting all Intel CPUs manufactured= in the last 10 years or so, in which protected kernel memory is leaked to = userspace.=C2=A0 It can't be patched in microcode and will lead to some= serious overhead to patch in the OS.=C2=A0 See,=C2=A0Huge Intel CPU Bug Allegedly Causes Kernel Memory Vulnerability With Up = To 30% Performance Hit In Windows And Linux=C2=A0and=C2=A0Meltdown and Spectre.

Reported at=C2=A0Bu= g 643360.
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