additional information: 1) the E6600 is a first generation Core 2 Duo processor. It is not able to increase the clock, if only one core is used.
2) there seems to be no thermal problem: the case is really well cooled and there used to be a thermaltake typhoon sitting on the CPU, now it is an Artic Freezer 7 pro (both fans non-throttled). With both coolers I did not manage to get cpu temperatures above 35 degree celsius when both cores were under full load for more than an hour, but the described problem occured with both coolers. 3) it does not seem to be a general vanilla linux kernel problem: when booting the opensuse cd, cat /proc/cpuinfo shows two cores, yet the speed is the same as on ubuntu hardy with only one core activated. So opensuse does not seem to have this problem. The fedora cd as well as ubuntu gutsy though do all have the same problem ubuntu hardy has. These three observations hint to: a) this does not seem to be a hardware problem. b) this apparent software problem seems to be ubuntu specific. -- Hardy kernel: single thread performance on dual core much worse than with maxcpus=1 https://bugs.launchpad.net/bugs/212201 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
