How do I enable hyperthreading in a Intel Xeon E5-2407?

Question

We have the following CPU that supports hyper-threading. Though Ubuntu doesn't recognize that each core supports 4 threads.

Intel® Xeon® Processor E5-2407 http://ark.intel.com/products/64614/

The server is a Dell PowerEdge R320 http://www.dell.com/support/Manuals/us/en/19/product/poweredge-r320

The results of lscpu is lscpu

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
CPU(s):                2
Thread(s) per core:    1
Core(s) per socket:    2
CPU socket(s):         1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 23
Stepping:              10
CPU MHz:               800.000
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              6144K

I've gone thru and checked the BIOS and I enabled all the features related to virtualization and logical CPUs.

Any ideas?

cpufreq is not being run as asked below

sudo cpufreq-info cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to cpufreq@vger.kernel.org, please. analyzing CPU 0: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. analyzing CPU 1: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. analyzing CPU 2: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. analyzing CPU 3: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms.

are you using any cpufreq utils ?, it seems your processor is in conservative mode .....and your 6 cores are offline — Qasim, Apr 25 '13 at 07:04

score 2 · Accepted Answer · answered Apr 25 '13 at 20:57

2

The Intel Xeon E5-2407 does not have Hyper-threading. Refer to this link. The Intel page you link to also lists the CPU has having only threads across 4 cores.

answered Apr 25 '13 at 20:57

Bert

3,225
1
14
12

Yes this is correct. The link that you gave, @user151932, specifically said it doesn't support hyperthreading. http://ark.intel.com/products/64614/#HyperThreading – bntser Apr 25 '13 at 21:04

score -1 · Answer 2 · edited Apr 13 '17 at 12:23

-1

11.10 is really old. Give 12.04 a try at least (if you want LTS... which you probably do.)
It should see all the cores. If it doesn't, report this as a bug.

How do I report a bug?

edited Apr 13 '17 at 12:23

Community

1

answered Apr 25 '13 at 08:27

Apache

5,030

I ran the 12.04 LiveCd, still the threads per core sees only 1 thread – user151932 Apr 25 '13 at 20:47
@user151932: Simple. Open up "top" in a terminal, and press "1". It will show you how many CPUs you have. Or cat /proc/cpuinfo | grep CPU – Apache Apr 25 '13 at 21:03

How do I enable hyperthreading in a Intel Xeon E5-2407?

2 Answers2