linux-kernel - Re: ioremap_uc() followed by set_memory_wc()

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Message-ID: <20150422204637.GA29491@obsidianresearch.com>
Date:	Wed, 22 Apr 2015 14:46:37 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Doug Ledford <dledford@...hat.com>
Cc:	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Andy Lutomirski <luto@...capital.net>,
	mike.marciniszyn@...el.com, infinipath@...el.com,
	linux-rdma@...r.kernel.org, awalls@...metrocast.net,
	Toshi Kani <toshi.kani@...com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Suresh Siddha <sbsiddha@...il.com>,
	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Roland Dreier <roland@...estorage.com>,
	Juergen Gross <jgross@...e.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Borislav Petkov <bp@...e.de>, Mel Gorman <mgorman@...e.de>,
	Vlastimil Babka <vbabka@...e.cz>,
	Davidlohr Bueso <dbueso@...e.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ville Syrj?l? <syrjala@....fi>,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
	linux-media@...r.kernel.org, X86 ML <x86@...nel.org>,
	mcgrof@...not-panic.com
Subject: Re: ioremap_uc() followed by set_memory_wc() - burrying MTRR

On Wed, Apr 22, 2015 at 02:53:11PM -0400, Doug Ledford wrote:

> To be precise, the split is that ipath powers the old HTX bus cards that
> only work in AMD systems, qib is all PCI-e cards.  I still have a few
> HTX cards, but I no longer have any systems with HTX slots, so we
> haven't even used this driver in testing for 3 or 4 years now.  And
> these are all old SDR cards, where the performance numbers were 800MB/s
> with WC enabled, 50MB/s without it.

Wow, I doubt any HTX systems are still in any kind of use.

It would be a nice clean up to drop the PPC support out of this driver
too. PPC never had HTX.

Jason
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