8 Replies Latest reply on Jul 20, 2011 2:43 PM by Raistmer

    Unacceptable performance degradation after Catalyst update

    Raistmer
      Updated from Cat 11.2 to Cat 11.6

      1) I got BSoD on Cat 11.2 uninstallation
      2) After removal of Cat 11.2 and installation of Cat 11.6 drivers I see huge performance degradation in my application.

      Moreover, OpenCL query now reports incorrect values for my GPU (HD6950)
      Here what it was reported before and after update:


      Number of OpenCL platforms: 1


      OpenCL Platform Name: ATI Stream
      Number of devices: 1
      Max compute units: 22
      Max work group size: 256
      Max clock frequency: 840Mhz
      Max memory allocation: 536870912
      Cache type: None
      Cache line size: 0
      Cache size: 0
      Global memory size: 2147483648
      Constant buffer size: 65536
      Max number of constant args: 8
      Local memory type: Scratchpad
      Local memory size: 32768
      Queue properties:
      Out-of-Order: No
      Name: Cayman
      Vendor: Advanced Micro Devices, Inc.
      Driver version: CAL 1.4.1016
      Version: OpenCL 1.1 ATI-Stream-v2.3 (451)
      Extensions: cl_amd_fp64 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_gl_sharing cl_amd_device_attribute_query cl_amd_printf cl_amd_media_ops cl_amd_popcnt cl_khr_d3d10_sharing


      after:

      Number of OpenCL platforms: 1


      OpenCL Platform Name: AMD Accelerated Parallel Processing
      Number of devices: 1
      Max compute units: 22
      Max work group size: 256
      Max clock frequency: 800Mhz
      Max memory allocation: 209715200
      Cache type: None
      Cache line size: 0
      Cache size: 0
      Global memory size: 838860800
      Constant buffer size: 65536
      Max number of constant args: 8
      Local memory type: Scratchpad
      Local memory size: 32768
      Queue properties:
      Out-of-Order: No
      Name: Cayman
      Vendor: Advanced Micro Devices, Inc.
      Driver version: CAL 1.4.1417 (VM)
      Version: OpenCL 1.1 AMD-APP-SDK-v2.4 (650.9)
      Extensions: cl_amd_fp64 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_gl_sharing cl_amd_device_attribute_query cl_amd_vec3 cl_amd_printf cl_amd_media_ops cl_amd_popcnt cl_khr_d3d10_sharing


      Wrong values are highlighted
      (not sure about 840MHz because quite possible that card operated on 800MHz before too, but memory amount and single allocation block are definitely bad)