cortic opened this issue on Jun 10, 2007 · 41 posts
pjz99 posted Sun, 10 June 2007 at 10:46 PM
One thing to check - set the renderer to only use ONE thread, and render something. Will it take one core to 100%? If it will, that's not a good sign - AMD X2 symmetric multiprocessing guts may not be implemented well, or may be getting used inefficiently for some reason.
AMD utilities downloads:
http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_13118,00.html
This sounds suspiciously like your problem:
AMD Dual-Core Optimizer - The AMD Dual-Core Optimizer can help improve some PC gaming video performance by compensating for those applications that bypass the Windows API for timing by directly using the RDTSC (Read Time Stamp Counter) instruction. Applications that rely on RDTSC do not benefit from the logic in the operating system to properly account for the affect of power management mechanisms on the rate at which a processor core's Time Stamp Counter (TSC) is incremented. The AMD Dual-Core Optimizer helps to correct the resulting video performance effects or other incorrect timing effects that these applications may experience on dual-core processor systems, by periodically adjusting the core time-stamp-counters, so that they are synchronized