Nouveau - Mar 2008 - [Bug 14922] New: start X with nouveau uses a lot of memory

http://bugs.freedesktop.org/show_bug.cgi?id=14922

           Summary: start X with nouveau uses a lot of memory
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: oli.huber at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=14985)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=14985)
some tests

I compared memory usage between nouveau and the blob : when I start with
nouveau, it uses ~500M more than with the other. But I can't find where this
memory is gone. No process in the userspace seems to have used it.
 When I kill X, I get my memory back. See the attachment for some figures.

videocard : 7800 GS AGP (256 Mo)
Kernel : 2.6.24-gentoo-r2
X: 1.4.0.90 plus some patches (I'm an gentoo user :  1.4.0.90-r3)
libdrm, x11-drm, mesa, nouveau from git (last build : 09/03/08 in the morning)


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http://bugs.freedesktop.org/show_bug.cgi?id=14922





--- Comment #1 from Olivier Huber <oli.huber at gmail.com>  2008-03-15
04:26:46 PST ---
I found that this memory was the AGP Aperture. I check my bios, and it was set
to 512 Mo. So I set it to 128 and my memory usage has decrease (see attachment
for details).

I have checked that this memory is seen by the kernel as used by creating a big
file in ram : 
dd if=dev/zero of =/var/tmp/portage/test bs=400M and it begins to swap.
(/var/tmp/portage/ is mount in tmpfs)


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Eric Smith <eric225125 at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |eric225125 at yahoo.com




--- Comment #2 from Eric Smith <eric225125 at yahoo.com>  2008-07-03
09:49:40 PST ---
I also have this problem with my 6800gt.  Is this the correct behaviour of AGP
Aperture?   Isn't it supposed to only used memory as needed?


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Stephane Marchesin <marchesin at icps.u-strasbg.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




--- Comment #3 from Stephane Marchesin <marchesin at icps.u-strasbg.fr> 
2008-07-17 16:10:10 PST ---
Yes it's proper behaviour. You can map lots of memory, that doesn't
always mean
you're using it, or even that it's allocated.


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