From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: A User <t02446@yahoo.com>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: [Xenomai] x86 Linux with xenomai and i915 graphics stall
Date: Tue, 22 Jan 2013 00:13:07 +0100 [thread overview]
Message-ID: <50FDCB83.4060707@xenomai.org> (raw)
In-Reply-To: <1358809464.75419.YahooMailNeo@web140601.mail.bf1.yahoo.com>
On 01/22/2013 12:04 AM, A User wrote:
> I'm trying to run a Linux/Xenomai system with Ubuntu 12.04 LTS
> distro including X Window System on an Intel x86 board.
>
> linux: 3.2.21
> xenomai: 2.6.1
> i-pipe Patch: 3.2.21-x86-1
>
> When I run with CONFIG_PCI_MSI turned off, I get good Xenomai latency,
> but the X Window System is unusable. With MSI turned on, graphics is
> solid, but latency jumps to about 450 usec when I run glxgears
> (instead of avg 10 usec, max 50 usec).
>
> I believe that if I want to use X Window system in a recent x86 system
> with motherboard graphics, the most popular choice (the only choice?)
> is i915.
>
> Do you have any advice on how I can run with i915 and Xenomai with
> this hardware and software?
That is strange, I have tested xenomai on my workstation which is a core
i5 and also has an i915, I have been playing video and running other
opengl apps (including glxgears) and dit not observe high latencies. I
was using Linux 3.5.7 patched with Xenomai 2.6.2, but I guess it should
not make any difference. My core i5 is a "sandy bridge" though, so
should have an intel graphics HD3000 not 4000.
I would suggest enabling the I-pipe tracer in the kernel configuration
in order to find what is taking so long.
Anyway, turning on CONFIG_PCI_MSI is recommended these days. Also, have
you read the troubleshooting guide about SMIs?
If you can not run an accelerated X server, there is always the solution
to revert to disable the acceleration in the server configuration, as is
documented in the troubleshooting guide as well.
--
Gilles.
next prev parent reply other threads:[~2013-01-21 23:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-21 23:04 [Xenomai] x86 Linux with xenomai and i915 graphics stall A User
2013-01-21 23:13 ` Gilles Chanteperdrix [this message]
2013-01-22 19:32 ` A User
2013-01-22 19:37 ` Gilles Chanteperdrix
2013-04-13 13:27 ` Gilles Chanteperdrix
-- strict thread matches above, loose matches on Subject: below --
2013-01-22 22:23 Daniel M. Drucker, Ph.D.
2013-01-22 22:27 ` Gilles Chanteperdrix
2013-01-22 22:29 ` Daniel M. Drucker, Ph.D.
2013-01-22 22:47 ` Gilles Chanteperdrix
[not found] ` <CAD1EtogPNsGWkA0_puttwFTGMfZ6aW1_1WniND0GRJYRba389Q@mail.gmail.com>
2013-01-24 22:22 ` Daniel M. Drucker, Ph.D.
2013-01-25 11:44 ` Gilles Chanteperdrix
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