Can I enable Hyper-Threading?

[ron999]

Hi
I've checked my CPU specs and it says that Hyper-Threading is supported.
When I use command:-

dmesg | grep CPU

It tells me that Hyper-Threading is disabled.

When I looked in my BIOS settings there is no option there to enable/disable Hyper-Threading.
There are some threads on the UbuntuForums that suggest Hyper-Threading can be enabled by making an entry in the GRUB.
I think that these threads are out-dated now. I'm using a later version of GRUB.

So, has anybody been successful in enabling Hyper-Threading with Karmic Koala 9.10?

ron@ubuntu:~$ dmesg | grep CPU
[ 0.000000] Transmeta TransmetaCPU
[ 0.000000] SMP: Allowing 4 CPUs, 3 hotplug CPUs
[ 0.000000] NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:4 nr_node_ids:1
[ 0.000000] PERCPU: Embedded 14 pages at c1985000, static data 35612 bytes
[ 0.000000] Initializing CPU#0
[ 0.000000] SLUB: Genslabs=13, HWalign=128, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.001962] CPU: Trace cache: 12K uops, L1 D cache: 16K
[ 0.001967] CPU: L2 cache: 256K
[ 0.001972] CPU: Hyper-Threading is disabled
[ 0.001978] mce: CPU supports 4 MCE banks
[ 0.002003] CPU0: Thermal monitoring enabled (TM1)
[ 0.087381] CPU0: Intel(R) Celeron(R) CPU 2.26GHz stepping 01
[ 0.088001] Brought up 1 CPUs
[ 0.088001] CPU0 attaching NULL sched-domain.
[ 0.519637] ACPI Error (psparse-0537): Method parse/execution failed [\_PR_.CPU1._PDC] (Node f700e150), AE_INVALID_TABLE_LENGTH
[ 0.519762] processor LNXCPU:00: registered as cooling_device0
[ 0.519770] ACPI: Processor [CPU0] (supports 16 throttling states)
[ 0.696041] Switched to high resolution mode on CPU 0

[mc4man]

Can you post some info on the cpu you have and or any other relevant info (manufacturer of computer, model ect.

never had a celeron, not sure if they are ht enabled ( you'd expect a bios setting if it was.

This may provide some info (use the blue, though sudo w/ lshw crashed my maverick it should be fine on karmic

sudo lshw -C cpu

For full pc info in a easy to browse form try this (look in home folder for the file

sudo lshw -html > hardware.html

[pommie]

According to Intel it is not a hyperthreading chip

http://ark.intel.com/Product.aspx?id=27447

Cheers David

[jerome1232]

You just linked a Pentium 4 and he's got a Celeron so....

[inso_741]

none of the celerons support HT(look here)
and if it did the linux kernel would detect it automatically, you dont have to configure it...


Edit: I think this is your processor

[pommie]

ooops

Same answer though

http://ark.intel.com/Product.aspx?id=27182

Cheers David

[cascade9]

none of the celerons support HT(look here)
and if it did the linux kernel would detect it automatically, you dont have to configure it...

Edit: I think this is your processor

Actually, there is one celeron that does have hyperthreading (and its even on that linked list), the P1053 model-

http://ark.intel.com/Product.aspx?id=47647

Intel disabled Hyperthreading on the P4 celerons, Core2 doesnt have hyperthreading, and the newest core iX based celerons are only just coming out now.......so unless its a very, very new CPU, celeron = no hyperthreading.

BTW, I agree with what you think the actual CPU is (celeron 315D), though it could be a G1011 or a 570.

[ron999]

Hi

@ mc4man
I've posted the CPU information here:-http://pastebin.ca/1930348

This part of cat /proc/cpuinfo indicates Hyper-Threading:-

flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc up pebs bts pni dtes64 monitor ds_cpl cid xtpr

This part of sudo dmidecode -t 4 indicates Hyper-Threading:-

HTT (Hyper-threading technology)

This part of cpuid indicates Hyper-Threading:-

HT Hyper Threading

@ inso_741
I think that your link is the correct one here:- http://ark.intel.com/Product.aspx?id...AW,SL8HH,SL93Q
That document states:-

Intel® Hyper-Threading Technology.....No

So probably the document is correct and the reports from cpuinfo/dmidecode/cpuid are errors.

In the handbook for my motherboard [eSys P4M800/478] it explains how to tinker with the BIOS settings.
It shows a picture with an option to enable/disable 'Hyper Threading Function' but on my screen the option isn't there. I assumed that it must be a different BIOS version. Maybe the option's not there because the CPU just doesn't support Hyper-Threading.

In those old UbuntuForum threads it said that the Linux kernel wasn't turning on Hyper-Threading automatically and that it needed to be enabled some other way if required. But that was then - probably the kernel has been updated several times since.

Thanks for your help guys.
It looks like the CPU doesn't support Hyper-Threading after all.

[inso_741]

the bios will display an option for HT only if the processor supports it....if you replace your processor with a P4-HT you'll get the option as the handbook suggests