[mythtv-users] very low glxgears fps

Jon jon at sd-6.org
Fri Mar 30 21:23:49 UTC 2007

Tom Lichti wrote:
> Gabe Rubin wrote:
>> On 3/30/07, James Warden <warjamy at yahoo.com> wrote:
>>> OK,
>>> so you seem to have most of the stuff configured. I
>>> would suggest you check what lsmod spits out through a
>>> 'grep agp'.
>> I will check that out when I get home.
>>> I don't remember what your xorg.conf AGP option was
>>> and it could be that even forcing this option in this
>>> file won't work if something during the boot process
>>> precedes the nvidia module loading that prevents the
>>> NvAGP option to work as expected. As I said, I had the
>>> intel_agp module loaded before nvidia with debian
>>> kernels and there was not much I could do to prevent
>>> this from happening (even if I blacklisted the damn
>>> module) so i had to recompile my kernel without that
>>> module and agpgart altogether. Only then NvAGP=1 in
>>> xorg.conf would have an effect. And it resulted in a
>>> big improvement as far as the 3D acc performance is
>>> concerned.
>> I have:
>>        #Option      "NvAGP" "1"
>> When that is uncommeted, it spit out some error in glxgears.  It seems
>> it is trying to load the agpart driver and won't load the NvAGP driver
>> as a result.  Some googling indicated I need to roll my own kernel,
>> but I really want to avoid that (I have tried that before without much
>> success, and I really don't want to have go through building kernel
>> modules constantly).
>> Can I adjust something in the bios?  Again, this is what my agp status
>> is, and I can't seem to change the driver to nvidia or get Fast Writes
>> enabled (thinking the two may be related).
>> [mythtv at localhost ~]$ cat /proc/driver/nvidia/agp/status
>> Status:          Enabled
>> Driver:          AGPGART
>> AGP Rate:        8x
>> Fast Writes:     Disabled
>> SBA:             Enabled
>> This is a fedora based system (FC5) and uses primarily atrpms packages.
> Find the agpgart kernel module on disk and rename it, uncomment the 
> NvAGP line in xorg.conf, and reboot. That should do it.
> Tom

Or, if agpgart in compiled in the kernel as seems to be common nowadays,
add agp=off to your favorite boot loaders command line.

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