> I don't know what Jeff meant by that, but we haven't seen a feasible way > of disabling HT without rebooting and using the BIOS options.
According to this page: http://dag.wieers.com/blog/is-hyper-threading-enabled-on-a-linux-system in RHEL5/CentOS-5 it's easy to switch it on and off on the fly. No wizardry required. (Disclaimer: I neither run RHEL nor bugger about with HT.)
