From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Date: Wed, 22 Apr 2015 20:46:37 +0000 Subject: Re: ioremap_uc() followed by set_memory_wc() - burrying MTRR Message-Id: <20150422204637.GA29491@obsidianresearch.com> List-Id: References: <20150421224601.GY5622@wotan.suse.de> <20150421225732.GA17356@obsidianresearch.com> <20150421233907.GA5622@wotan.suse.de> <20150422053939.GA29609@obsidianresearch.com> <20150422152328.GB5622@wotan.suse.de> <20150422161755.GA19500@obsidianresearch.com> <1429728791.121496.10.camel@redhat.com> In-Reply-To: <1429728791.121496.10.camel@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Doug Ledford Cc: "Luis R. Rodriguez" , Andy Lutomirski , mike.marciniszyn@intel.com, infinipath@intel.com, linux-rdma@vger.kernel.org, awalls@md.metrocast.net, Toshi Kani , "H. Peter Anvin" , Ingo Molnar , "linux-kernel@vger.kernel.org" , Hal Rosenstock , Sean Hefty , Suresh Siddha , Rickard Strandqvist , Roland Dreier , Juergen Gross , Mauro Carvalho Chehab , Borislav Petkov , Mel Gorman , Vlastimil Babka , Davidlohr Bueso , Dave Hansen , Jean-Christophe Plagniol-Villard , Thomas Gleixner , Ville Syrj?l? , Linux Fbdev development list , linux-media@vger.kernel.org, X86 ML , mcgrof@do-not-panic.com 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