[mythtv-users] very low glxgears fps

Tom Lichti tom at redpepperracing.com
Fri Mar 30 18:19:21 UTC 2007

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.


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