top output, hyper-threading, and 2.5.69 kernel
I have a dual-Xeon (hyperthread) processor system on an Intel serverboard.
When booted up under kernel 2.4.20, the top output indicates 4 processors are
running. I can toggle the output using the "1" key to show all processors
combined, or 4 independent processors.
When I boot up under the 2.5.69 kernel (there does not appear to be a HT
switch in the menuconfig, but I do have CONFIG_X86_HT=y in the .config file),
the top command only shows 2 processors running.
Does this mean that hyperthreading is not enabled ?
If hyperthreading is enabled, and I have two physical processors, should the
top command show 4 processors running ?
Why is the top output different between 2.4.20 and 2.5.69 ?
James D. Freels, Ph.D.
Oak Ridge National Laboratory