I've put together a test program that demonstrates the performance degradation introduced by this bug. The attached tar ball contains information about the test program and oprofile runs demonstrating the differences in performance with max_cstate=1 and max_cstate=8.
I believe Ubuntu defect 50153 is a duplicate of 30557 because the symptoms and workarounds are the same. However, 50153 is not reproducible in 2.6.15-23. I first noticed the problem in 2.6.15-25. This is in conflict with what some other reporters have experienced, with 30557 first appearing in 2.6.15-15. The attached tar file contains the oprofile reports, the test program, and a more detailed description of my tests. -- cpu idle time in /proc/stat wrong https://launchpad.net/bugs/30557 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
