[mythtv-users] very low glxgears fps

[Tom Lichti]

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