I have a workstation with two Xeons that can be put in 'multithreading' mode by setting a flag in the BIOS. Is it useful to do this when running Solaris?
Here is some output about the CPU:
depaepe at dual_xeon:~# kstat -m cpu_info
module: cpu_info instance: 0
name: cpu_info0 class: misc
brand Intel(r) XEON(tm) CPU 2.20GHz
chip_id 0
clock_MHz 2181
clog_id 0
core_id 0
cpu_type i386
crtime 61.60908222
current_clock_Hz 2180748385
family 15
fpu_type i387 compatible
implementation x86 (chipid 0x0 GenuineIntel F24 family
15 model 2 step 4 clock 2181 MHz)
model 2
ncore_per_chip 1
ncpu_per_chip 2
pkg_core_id 0
snaptime 6016.088821629
state on-line
state_begin 1228424451
stepping 4
supported_frequencies_Hz 2180748385
vendor_id GenuineIntel
module: cpu_info instance: 1
name: cpu_info1 class: misc
brand Intel(r) XEON(tm) CPU 2.20GHz
chip_id 3
clock_MHz 2181
clog_id 0
core_id 3
cpu_type i386
crtime 63.264153784
current_clock_Hz 2180748385
family 15
fpu_type i387 compatible
implementation x86 (chipid 0x3 GenuineIntel F24 family
15 model 2 step 4 clock 2181 MHz)
model 2
ncore_per_chip 1
ncpu_per_chip 2
pkg_core_id 0
snaptime 6016.090249247
state on-line
state_begin 1228424452
stepping 4
supported_frequencies_Hz 2180748385
vendor_id GenuineIntel
depaepe at dual_xeon:~# kstat -m cpu_info
module: cpu_info instance: 0
name: cpu_info0 class: misc
brand Intel(r) XEON(tm) CPU 2.20GHz
chip_id 0
clock_MHz 2181
clog_id 0
core_id 0
cpu_type i386
crtime 61.60908222
current_clock_Hz 2180748385
family 15
fpu_type i387 compatible
implementation x86 (chipid 0x0 GenuineIntel F24 family
15 model 2 step 4 clock 2181 MHz)
model 2
ncore_per_chip 1
ncpu_per_chip 2
pkg_core_id 0
snaptime 6032.788613886
state on-line
state_begin 1228424451
stepping 4
supported_frequencies_Hz 2180748385
vendor_id GenuineIntel
module: cpu_info instance: 1
name: cpu_info1 class: misc
brand Intel(r) XEON(tm) CPU 2.20GHz
chip_id 3
clock_MHz 2181
clog_id 0
core_id 3
cpu_type i386
crtime 63.264153784
current_clock_Hz 2180748385
family 15
fpu_type i387 compatible
implementation x86 (chipid 0x3 GenuineIntel F24 family
15 model 2 step 4 clock 2181 MHz)
model 2
ncore_per_chip 1
ncpu_per_chip 2
pkg_core_id 0
snaptime 6032.790026664
state on-line
state_begin 1228424452
stepping 4
supported_frequencies_Hz 2180748385
vendor_id GenuineIntel
depaepe at dual_xeon:~#
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