From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: "Daniel M. Drucker, Ph.D." <dmd@interactive-motion.com>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai] x86 Linux with xenomai and i915 graphics stall
Date: Tue, 22 Jan 2013 23:27:21 +0100 [thread overview]
Message-ID: <50FF1249.2070807@xenomai.org> (raw)
In-Reply-To: <CAD1EtogQBZ5f=7w5mZz19rrnQVB_BP=t-f4rKtq12wKn9cd1Yw@mail.gmail.com>
On 01/22/2013 11:23 PM, Daniel M. Drucker, Ph.D. wrote:
> Hi Gilles et al.,
>
>> That is unusual, a typical latency on x86 is under 50us (and this is a
>> conservative bound). In order to investigate this, enable the I-pipe
>> tracer in the kernel configuration and run latency -f. Also set the
>> number of backtrace points to a large value, say 1000 or 10000 and post
>> the trace here.
>
> Here is the trace before running glxgears. The worst latency is 32us.
>
> https://gist.github.com/raw/4599095/203ce77b2bb8e1b2c797302d33ce1a7b0a18fbac/gistfile1
>
> And here is the trace while running glxgears. The worst latency is 724us.
>
> https://gist.github.com/raw/4599099/27054c46f246999375346ed942f76d0757c4fa0a/gistfile1
And you are sure that it is not an SMI issue? Could you post your kernel
configuration?
--
Gilles.
next prev parent reply other threads:[~2013-01-22 22:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-22 22:23 [Xenomai] x86 Linux with xenomai and i915 graphics stall Daniel M. Drucker, Ph.D.
2013-01-22 22:27 ` Gilles Chanteperdrix [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2013-01-21 23:04 A User
2013-01-21 23:13 ` Gilles Chanteperdrix
2013-01-22 19:32 ` A User
2013-01-22 19:37 ` Gilles Chanteperdrix
2013-04-13 13:27 ` Gilles Chanteperdrix
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=50FF1249.2070807@xenomai.org \
--to=gilles.chanteperdrix@xenomai.org \
--cc=dmd@interactive-motion.com \
--cc=xenomai@xenomai.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.