2 Replies Latest reply on Dec 3, 2014 4:30 AM by kmgl

    GL_AMD_bus_addressable_memory - W5100

    kmgl

      Hello,

      I try to use DirectGMA but I cannot find the required extension: GL_AMD_bus_addressable_memory from glxinfo nor when using CodeXL.

      I use the new APP-SDKv2.9.1 and fglrx-14.41 on the FirePro W5100. My OS is RHEL 6.6.

       

      What am I missing?

       

      Thank you,

      KmgL

        • Re: GL_AMD_bus_addressable_memory - W5100
          chm

          Hi,

           

          the extension is only exposed if a PCIE Aperture that can be used for DirectGMA is enabled. This is not done by default. You need to run the following commands as root and reboot (restarting X is not enough):

           

          aticonfig --set-pcs-val=MCIL,DMAOGLExtensionApertureMB,96

          aticonfig --set-pcs-u32=KERNEL,InitialPhysicalUswcUsageSize,96

           

          This will set the size of the aperture to 96 MB. The max that is currently supported is 128 MB. Now you should see the GL_AMD_bus_addressable_memory extension when calling glxinfo.

           

          Chris