linux-kernel - Re: i915.ko WC writes are slow after ea8596bb2d8d379

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Date:	Thu, 9 Oct 2014 07:44:16 -0500
From:	Chuck Ebbert <cebbert.lkml@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jason Baron <jbaron@...mai.com>, yrl.pp-manager.tt@...achi.com,
	Borislav Petkov <bpetkov@...e.de>,
	Ingo Molnar <mingo@...nel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: i915.ko WC writes are slow after ea8596bb2d8d379

On Thu, 9 Oct 2014 07:53:31 +0100
Chris Wilson <chris@...is-wilson.co.uk> 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?
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