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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Thomas Schlichter <thomas.schlichter@web.de>
Cc: Jan Beulich <JBeulich@novell.com>,
	Thomas Hellstrom <thellstrom@vmware.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Suresh Siddha <suresh.b.siddha@intel.com>,
	Arjan van de Ven <arjan@linux.intel.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	jbarnes@virtuousgeek.org, Ingo Molnar <mingo@redhat.com>,
	Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>,
	Tejun Heo <tj@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
	dri-devel@lists.sourceforge.net, Yinghai Lu <yinghai@kernel.org>,
	Robert Hancock <hancockrwd@gmail.com>
Subject: Re: [RFC Patch] use MTRR for write combining if PAT is not available
Date: Mon, 19 Oct 2009 09:36:18 -0400	[thread overview]
Message-ID: <20091019133618.GA12359@phenom.dumpdata.com> (raw)
In-Reply-To: <200910172148.36267.thomas.schlichter@web.de>

> X.org uses libpciaccess which tries to mmap with write combining enabled via
> /sys/bus/pci/devices/*/resource0_wc. Currently, when PAT is not enabled, we
> fall back to uncached mmap. Then libpciaccess thinks it succeeded mapping
> with write combining anabled and does not set up suited MTRR entries. ;-(

I am not familiar with libpciaccess, but I was wondering why that library
cannot realize it failed in its endeavour and use other means to accomplish
its goals?


  parent reply	other threads:[~2009-10-19 13:46 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-10-13  7:34 [RFC Patch] use MTRR for write combining if PAT is not available Jan Beulich
2009-10-13 21:29 ` Thomas Schlichter
2009-10-14  8:13   ` Jan Beulich
2009-10-14 19:14     ` Thomas Schlichter
2009-10-15  7:48       ` Jan Beulich
2009-10-17 19:48         ` Thomas Schlichter
2009-10-19  9:16           ` Jan Beulich
2009-10-19 13:44             ` Suresh Siddha
2009-10-19 13:54               ` Ingo Molnar
2009-10-19 13:36           ` Konrad Rzeszutek Wilk [this message]
  -- strict thread matches above, loose matches on Subject: below --
2009-10-22 14:41 Thomas Schlichter
2009-10-22 14:27 Thomas Schlichter
2009-10-22 12:08 Thomas Schlichter
2009-10-22 12:14 ` H. Peter Anvin
2009-10-22 13:26   ` Suresh Siddha
2009-10-22 13:35 ` Suresh Siddha
2009-10-21 14:38 Thomas Schlichter
2009-10-21 15:14 ` Jan Beulich
2009-10-21 13:45 Thomas Schlichter
2009-10-21 14:11 ` Jan Beulich
2009-10-21 17:35   ` Ingo Molnar
2009-10-21 20:01     ` Thomas Schlichter
2009-10-22  9:53       ` Suresh Siddha
2009-10-22 15:34         ` Eric Anholt
2009-10-22 21:47           ` Suresh Siddha
2009-10-22 23:10             ` Jesse Barnes
2009-10-23  0:11               ` Suresh Siddha
2009-10-23  1:53                 ` Eric Anholt
2009-10-23  4:31                   ` Jesse Barnes
2009-10-23  4:58                     ` Suresh Siddha
2009-10-23  7:24                       ` Thomas Schlichter
2009-10-23 14:24                         ` Suresh Siddha
2009-10-23 14:37                           ` Ingo Molnar
2009-10-23  4:33                   ` Suresh Siddha
2009-10-19 15:10 Thomas Schlichter
2009-10-19 15:28 ` Ingo Molnar
2009-10-19 15:07 Thomas Schlichter
2009-10-19 14:59 Thomas Schlichter
2009-10-19 15:31 ` Ingo Molnar
2009-10-19 21:49   ` Suresh Siddha
2009-10-20 20:35   ` Thomas Schlichter
2009-10-20 21:59     ` Suresh Siddha
2009-10-21 11:52       ` Ingo Molnar
2009-10-19 14:47 Thomas Schlichter
2009-10-20 19:54 ` Thomas Schlichter
2009-10-21 11:57   ` Ingo Molnar
     [not found] <200910122032.52168.thomas.schlichter@web.de>
2009-10-12 19:16 ` Thomas Hellstrom
2009-10-12 19:45   ` Thomas Schlichter
     [not found]     ` <1255378684.2063.5.camel@gaiman.anholt.net>
2009-10-13 21:05       ` Thomas Schlichter
2009-10-10  1:22 Thomas Schlichter
2009-10-10  4:24 ` Arjan van de Ven
2009-10-10  8:31   ` Thomas Schlichter
2009-10-10 15:45     ` Arjan van de Ven
2009-10-10 17:50       ` Roland Dreier
2009-10-11  7:40       ` Ingo Molnar
2009-10-11  9:56       ` Thomas Schlichter
2009-10-11 18:51   ` Henrique de Moraes Holschuh
2009-10-11 18:54     ` Arjan van de Ven
2009-10-11 20:19       ` Henrique de Moraes Holschuh
2009-10-12 18:09         ` Robert Hancock

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