Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755616AbaJIMwv (ORCPT ); Thu, 9 Oct 2014 08:52:51 -0400 Received: from mail-oi0-f45.google.com ([209.85.218.45]:48852 "EHLO mail-oi0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751834AbaJIMwm (ORCPT ); Thu, 9 Oct 2014 08:52:42 -0400 Date: Thu, 9 Oct 2014 07:44:16 -0500 From: Chuck Ebbert To: Chris Wilson Cc: "H. Peter Anvin" , linux-kernel@vger.kernel.org, Masami Hiramatsu , Jiri Kosina , Steven Rostedt , Jason Baron , yrl.pp-manager.tt@hitachi.com, Borislav Petkov , Ingo Molnar , Daniel Vetter , x86@kernel.org, Thomas Gleixner Subject: Re: i915.ko WC writes are slow after ea8596bb2d8d379 Message-ID: <20141009074416.1480426a@as> In-Reply-To: <20141009065331.GG12897@nuc-i3427.alporthouse.com> References: <20141008090336.GD12897@nuc-i3427.alporthouse.com> <20141008051059.65566251@as> <20141008194955.GF12897@nuc-i3427.alporthouse.com> <5435AE71.60304@linux.intel.com> <20141009065331.GG12897@nuc-i3427.alporthouse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 9 Oct 2014 07:53:31 +0100 Chris Wilson wrote: > # cat /proc/mtrr > reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back > reg01: base=0x080000000 ( 2048MB), size= 256MB, count=1: write-back > reg02: base=0x08e000000 ( 2272MB), size= 32MB, count=1: uncachable > reg03: base=0x08d000000 ( 2256MB), size= 16MB, count=1: uncachable > reg04: base=0x100000000 ( 4096MB), size= 2048MB, count=1: write-back > reg05: base=0x170000000 ( 5888MB), size= 256MB, count=1: uncachable > reg06: base=0x16f000000 ( 5872MB), size= 16MB, count=1: uncachable > reg07: base=0x16e800000 ( 5864MB), size= 8MB, count=1: uncachable > reg08: base=0x16e600000 ( 5862MB), size= 2MB, count=1: uncachable > Well that's what the kernel thinks is in every CPU. Could you try installing x86info and running "x86info --mtrr --all-cpus" while running the broken kernel? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/