Hello everyone - Thanks for the suggestions. I tried a few things, but no luck so far.
1) I went into the BIOS and disabled Intel EIST.
2) I edited /etc/sysconfig/cpupower to have "performance" as the driver on all lines.
# See 'cpupower help' and cpupower(1) for more info
CPUPOWER_START_OPTS="frequency-set -g performance"
CPUPOWER_STOP_OPTS="frequency-set -g performance"
3) I edited the scaling-governor files under each CPU. They all read "performance" now.
4) cpupower frequency-info now gives this information:
[root@main2 sysconfig]# cpupower frequency-info
analyzing CPU 0:
no or unknown cpufreq driver is active on this CPU
boost state support:
2200 MHz max turbo 4 active cores
2200 MHz max turbo 3 active cores
2500 MHz max turbo 2 active cores
2500 MHz max turbo 1 active cores
The processor is an Intel i5-760 on a SuperMicro C7SIM-Q mainboard.
After steps 1 through 4, I rebooted.
5) I do not have another system where I can do a clean install. I can build VirtualBox systems, but I don't think that will help diagnose this problem. My VirtualBox host is the same mainboard with an i7 processor and Fedora 15. I am disinclined to upgrade it to F16 ...
This system will rip audio CD at full speed, but it is very inconvenient to use it because it does not have a good connection to the final storage location for the ripped files. I have to copy gigabytes of stuff up to a server temp dir, then down to a workstation.
6) Yesterday I ran "yum update" and took everything it offered. I am running the latest kernel. The update did not improve the speed of ripping.