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Date:      Fri, 12 Aug 2016 20:56:34 +0200
From:      "inti.glez.herrera" <inti.glez.herrera@gmail.com>
To:        freebsd-x11@freebsd.org
Subject:   testing drm-next 4.6 on i915 broadwell
Message-ID:  <CAKJji3oTPVGk2VAkp3R2yq3a9ryPh%2B1dX92oZ9WKN-hy%2BAh%2BXg@mail.gmail.com>

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Hello,

My current laptop features the i915 Broadwell microarchitecture. I was
trying to use FreeBSD when I realized that the graphic support is
limited. I am interested on actively contributing to the development
(although unfortunately, so far my knowledge is limited). After
cloning freebsd-base-graphcis  (branch drm-next-4.6), I can finally
load the device driver and run Xorg. However, there are some problems:

- The response time becomes really slow.
- Typing a simple command in the console can take 20 seconds.
- The mouse is also moving slow
- Executing a simple startx implies a reset because it slowdown the system
- Even a simple xclock is a problem

I was trying to identify where is the issue and my plan was using
dtrace. Right now I can use it to collect kernel stack traces, but
instead of the name of function, the output is only showing the
addresses.

My question is: do  I need to compile the kernel with some special
flags to support symbols in dtrace ?

A secondary question : do you recommend another profiler (or tool) to
debug this kind of problem ?

Some basic information: I am using the generic configuration and I
updated a bunch of ports using freebsd-ports-graphics.

- Inti



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