Load at 1.00 on SMP machine
Axel S. Gruner
liste at encephalon.de
Mon Nov 21 17:21:03 GMT 2005
Am 21.11.2005 um 16:17 schrieb <myfreebsd at cox.net> <myfreebsd at cox.net>:
>> i got a Problem on my dual XEON 3.06 GhZ machine, 2GB of >RAM,
>> I got "option SMP" in the kernel config and
>> >"machdep.hlt_logical_cpus=1" in
>> There are just 20 processes running (typical ones like >getty and
>> stuff) and
>> the load of this machine is at 1.xx. There is no bgfsck and >other
>> So, i built a new kernel without "option SMP", rebooted, >and the
>> load was
>> at 0.0x. But only one CPU was used (detected).
>> So, what could bei the Problem?
>> Well, the machine shows me 4 CPUs, HTT is not enabled via >/boot/
>> and "machdep.hyperthreading_allowed". So, how to disable >HTT?
>> Maybe this is
>> the problem of the high load?
> Why are you setting machdep.hlt_logical_cpus=1? My understanding,
> this would turn off one of the cpus. It should be set to 0 to have
> both cpus going. Also it is set in sysctl.conf not loader.conf, at
> least, that is how I have it.
Both CPUs are working. Also, works with machdep in loader.conf.
Thats not the problem.
> I am also curious how machdep.hyperthreading_allowed works. I run 6
> so I believe it is turned on by default. Is this correct? Also if
> it is a solo cpu with HTT, do you need option SMP and
> machdep.hlt_logical_cpus=0 set or not with
> machdep.hyperthreading_allowed on?
I do not know. I just want turn off HTT, but stay with SMP. So i want
my two phyiscal CPUs working, but not the logical (HTT) one.
This is because is think maybe the load of 1.0x comes from turning on
HTT. Well, if i do not use SMP in the kernel, the load is fine, but
there is just one of the physical CPUs working.
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