From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050512 Red Hat/1.0.4-1.4.1 Firefox/1.0.4 Description of problem: When using a HyperThreaded Pentium 4 CPU, the cpuspeed daemon doens't use an effective algorithm for determining the current CPU utilizization. Since a single CPU intensive process only runs on one "virtual" CPU, the other CPU appears 100% idle, giving a net system usage of 50%. cpuspeed sees this and lowers the clock speed, slowing down the otherwise CPU intensive application. When running on a hyperthreaded system, cpuspeed should use the most active "virtual" processor as its gauge for current system activity. Version-Release number of selected component (if applicable): kernel-utils-2.4-13.1.48 How reproducible: Always Steps to Reproduce: 1. start cpuspeed 2. run an intense cpu benchmark on one "virtual" processor 3. cat /proc/cpuinfo and watch the processor get slowed to its lowest state (2.8 GHz on my 3.6 GHz box) Actual Results: The cpu was frequency scaled down to its lowest state. Expected Results: The cpu should have run at the maximum clock speed since the benchmark was utilizing 100% of one of the "virtual" processors. Additional info:
Is this still an issue with the latest RHEL4 kernel and kernel-utils packages? I'm taking over all cpu frequency scaling bugs, and trying to work my way through them...
4+ months of no activity, 1.5+ years since hearing from the original poster, closing out bug.