From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: "Luis R. Rodriguez" <mcgrof@suse.com>
Cc: "Andy Lutomirski" <luto@amacapital.net>,
mike.marciniszyn@intel.com, infinipath@intel.com,
linux-rdma@vger.kernel.org, awalls@md.metrocast.net,
"Toshi Kani" <toshi.kani@hp.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Ingo Molnar" <mingo@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Hal Rosenstock" <hal.rosenstock@gmail.com>,
"Sean Hefty" <sean.hefty@intel.com>,
"Suresh Siddha" <sbsiddha@gmail.com>,
"Rickard Strandqvist" <rickard_strandqvist@spectrumdigital.se>,
"Roland Dreier" <roland@purestorage.com>,
"Juergen Gross" <jgross@suse.com>,
"Mauro Carvalho Chehab" <mchehab@osg.samsung.com>,
"Borislav Petkov" <bp@suse.de>, "Mel Gorman" <mgorman@suse.de>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Davidlohr Bueso" <dbueso@suse.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Jean-Christophe Plagniol-Villard" <plagnioj@jcrosoft.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ville Syrjälä" <syrjala@sci.fi>,
"Linux Fbdev development list" <linux-fbdev@vger.kernel.org>,
linux-media@vger.kernel.org, "X86 ML" <x86@kernel.org>,
mcgrof@do-not-panic.com
Subject: Re: ioremap_uc() followed by set_memory_wc() - burrying MTRR
Date: Tue, 21 Apr 2015 22:57:32 +0000 [thread overview]
Message-ID: <20150421225732.GA17356@obsidianresearch.com> (raw)
In-Reply-To: <20150421224601.GY5622@wotan.suse.de>
On Wed, Apr 22, 2015 at 12:46:01AM +0200, Luis R. Rodriguez wrote:
> are talking about annotating the qib driver as "known to be broken without PAT"
> and since the ipath driver needs considerable work to be ported to
> use PAT (the
This only seems to be true for one of the chips that driver supports,
not all possibilities.
> userspace register is just one area) I wanted to review if we can just remove
> MTRR use on the ipath driver and annotate write-combining with PAT as a TODO
> item.
AFAIK, dropping MTRR support will completely break the performance to
the point the driver is unusable. If we drop MTRR we may as well
remove the driver.
Mike, do you think the time is right to just remove the iPath driver?
Jason
next prev parent reply other threads:[~2015-04-21 22:57 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20150410171750.GA5622@wotan.suse.de>
[not found] ` <CALCETrUG=RiG8S9Gpiqm_0CxvxurxLTNKyuyPoFNX46EAauA+g@mail.gmail.com>
[not found] ` <CAB=NE6XgNgu7i2OiDxFVJLWiEjbjBY17-dV7L3yi2+yzgMhEbw@mail.gmail.com>
[not found] ` <1428695379.6646.69.camel@misato.fc.hp.com>
[not found] ` <20150410210538.GB5622@wotan.suse.de>
[not found] ` <1428699490.21794.5.camel@misato.fc.hp.com>
[not found] ` <CALCETrUP688aNjckygqO=AXXrNYvLQX6F0=b5fjmsCqqZU78+Q@mail.gmail.com>
[not found] ` <20150411012938.GC5622@wotan.suse.de>
[not found] ` <CALCETrXd19C6pARde3pv-4pt-i52APtw5xs20itwROPq9VmCfg@mail.gmail.com>
2015-04-13 17:49 ` ioremap_uc() followed by set_memory_wc() - burrying MTRR Luis R. Rodriguez
2015-04-15 20:42 ` Andy Lutomirski
2015-04-15 20:56 ` H. Peter Anvin
2015-04-15 22:15 ` Luis R. Rodriguez
2015-04-15 22:50 ` Andy Walls
2015-04-15 23:52 ` Andy Lutomirski
2015-04-16 0:33 ` Andy Walls
2015-04-21 22:46 ` Luis R. Rodriguez
2015-04-21 22:57 ` Jason Gunthorpe [this message]
2015-04-21 23:39 ` Luis R. Rodriguez
2015-04-22 5:39 ` Jason Gunthorpe
2015-04-22 15:23 ` Luis R. Rodriguez
2015-04-22 15:54 ` Luis R. Rodriguez
2015-04-22 15:59 ` Luis R. Rodriguez
2015-04-22 16:17 ` Jason Gunthorpe
2015-04-22 16:51 ` Luis R. Rodriguez
2015-04-22 18:53 ` Doug Ledford
2015-04-22 19:05 ` Luis R. Rodriguez
2015-04-22 19:10 ` Doug Ledford
2015-04-22 19:14 ` Luis R. Rodriguez
2015-04-22 20:46 ` Jason Gunthorpe
2015-04-22 20:58 ` Doug Ledford
2015-04-22 16:53 ` Andy Lutomirski
2015-04-22 17:07 ` Luis R. Rodriguez
2015-04-15 22:38 ` Andy Walls
2015-04-15 23:42 ` Andy Lutomirski
2015-04-15 23:59 ` Andy Walls
2015-04-16 0:58 ` Andy Lutomirski
2015-04-16 1:01 ` Andy Walls
2015-04-16 19:19 ` Andy Lutomirski
2015-04-21 17:35 ` Luis R. Rodriguez
2015-04-15 23:58 ` Luis R. Rodriguez
2015-04-16 1:07 ` Andy Walls
2015-04-21 22:02 ` Luis R. Rodriguez
2015-04-21 22:08 ` Luis R. Rodriguez
2015-04-21 22:09 ` Andy Lutomirski
[not found] ` <5536d47a.95968c0a.1d12.ffffbf85@mx.google.com>
2015-04-21 23:14 ` Luis R. Rodriguez
2015-04-16 4:18 ` Hyong-Youb Kim
2015-04-16 18:54 ` Luis R. Rodriguez
2015-04-17 8:00 ` Hyong-Youb Kim
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20150421225732.GA17356@obsidianresearch.com \
--to=jgunthorpe@obsidianresearch.com \
--cc=awalls@md.metrocast.net \
--cc=bp@suse.de \
--cc=dave.hansen@linux.intel.com \
--cc=dbueso@suse.de \
--cc=hal.rosenstock@gmail.com \
--cc=hpa@zytor.com \
--cc=infinipath@intel.com \
--cc=jgross@suse.com \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=luto@amacapital.net \
--cc=mcgrof@do-not-panic.com \
--cc=mcgrof@suse.com \
--cc=mchehab@osg.samsung.com \
--cc=mgorman@suse.de \
--cc=mike.marciniszyn@intel.com \
--cc=mingo@kernel.org \
--cc=plagnioj@jcrosoft.com \
--cc=rickard_strandqvist@spectrumdigital.se \
--cc=roland@purestorage.com \
--cc=sbsiddha@gmail.com \
--cc=sean.hefty@intel.com \
--cc=syrjala@sci.fi \
--cc=tglx@linutronix.de \
--cc=toshi.kani@hp.com \
--cc=vbabka@suse.cz \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).