Ke fallo, pos eso, ke fiandome de los drivers de Matrox (binarios), creía ke ya de por si habrían activao el modo agp adecuao y de eso ná.
Akí os paso los resultaos de pasar el agp de 1x a 2x [el conjunto northbridge-puerto agp de la placa me limita esta característica puesto ke soporta hasta 2x: es un AMD 751 alias Irongate]
(los resultaos son nuevos, tan pillaos rulando en un rethat 6.2, kde 1 actualizao Xfree 4.1.0 & kernel 2.4.19 entre otras cosas ;) )
Athlon 600 slot A, 256 MB PC133 a 100Mhz, Matrox G400 DH 32 MB, agp aperture size=128MB, AGP MODE : 2x, irongate wth superbypass mode enable
Resolución de escritorio: 1024x768 16bits
Con la ventana de glxgears por defecto.
[root@localhost home]$ glxgears -info
GL_RENDERER = Mesa DRI G400 20010321 AGP 2x x86/MMX/3DNow!
GL_VERSION = 1.2 Mesa 3.4.2
GL_VENDOR = VA Linux Systems Inc.
GL_EXTENSIONS = GL_ARB_multitexture GL_ARB_transpose_matrix GL_EXT_abgr GL_EXT_b
lend_func_separate GL_EXT_clip_volume_hint GL_EXT_histogram GL_EXT_packed_pixels
GL_EXT_polygon_offset GL_EXT_rescale_normal GL_EXT_stencil_wrap GL_EXT_texture3
D GL_EXT_texture_env_add GL_EXT_texture_object GL_EXT_vertex_array GL_MESA_windo
w_pos GL_MESA_resize_buffers GL_NV_texgen_reflection GL_PGI_misc_hints GL_SGIS_p
ixel_texture GL_SGIS_texture_edge_clamp
6405 frames in 5.0 seconds = 1281.000 FPS
6491 frames in 5.0 seconds = 1298.200 FPS
6490 frames in 5.0 seconds = 1298.000 FPS
6491 frames in 5.0 seconds = 1298.200 FPS
6490 frames in 5.0 seconds = 1298.000 FPS
6490 frames in 5.0 seconds = 1298.000 FPS
6491 frames in 5.0 seconds = 1298.200 FPS
6491 frames in 5.0 seconds = 1298.200 FPS
6491 frames in 5.0 seconds = 1298.200 FPS
6491 frames in 5.0 seconds = 1298.200 FPS
6491 frames in 5.0 seconds = 1298.200 FPS
6492 frames in 5.0 seconds = 1298.400 FPS
6491 frames in 5.0 seconds = 1298.200 FPS
X connection to :0.0 broken (explicit kill or server shutdown).
[root@localhost home]$
Con esta distro y la misma conf salvo poner el agp a 1x consigo 1225fps : tonces de agp1x-->agp2x +6%, argo es argo XD
Con la ventana de glxgears máximizada y agp a 2x:
[root@localhost home]$ glxgears -info
GL_RENDERER = Mesa DRI G400 20010321 AGP 2x x86/MMX/3DNow!
GL_VERSION = 1.2 Mesa 3.4.2
GL_VENDOR = VA Linux Systems Inc.
GL_EXTENSIONS = GL_ARB_multitexture GL_ARB_transpose_matrix GL_EXT_abgr GL_EXT_blend_func_separate GL_EXT_clip_volume_hint GL_EXT_histogram GL_EXT_packed_pixels GL_EXT_polygon_offset GL_EXT_rescale_normal GL_EXT_stencil_wrap GL_EXT_texture3D GL_EXT_texture_env_add GL_EXT_texture_object GL_EXT_vertex_array GL_MESA_window_pos GL_MESA_resize_buffers GL_NV_texgen_reflection GL_PGI_misc_hints GL_SGIS_pixel_texture GL_SGIS_texture_edge_clamp
3585 frames in 5.0 seconds = 717.000 FPS
1190 frames in 5.0 seconds = 238.000 FPS
1190 frames in 5.0 seconds = 238.000 FPS
1191 frames in 5.0 seconds = 238.200 FPS
1190 frames in 5.0 seconds = 238.000 FPS
1190 frames in 5.0 seconds = 238.000 FPS
1191 frames in 5.0 seconds = 238.200 FPS
1190 frames in 5.0 seconds = 238.000 FPS
1190 frames in 5.0 seconds = 238.000 FPS
1191 frames in 5.0 seconds = 238.200 FPS
1190 frames in 5.0 seconds = 238.000 FPS
1191 frames in 5.0 seconds = 238.200 FPS
1188 frames in 5.0 seconds = 237.600 FPS
1191 frames in 5.0 seconds = 238.200 FPS
1190 frames in 5.0 seconds = 238.000 FPS
X connection to :0.0 broken (explicit kill or server shutdown).