Hyperthreading on 9100

[michaelob]

Hi,

We are using Itanium 2 9100 series Montvale processors and I want to know if this processor supports hyperthreading

#setboot -v

Hyperthreading=on

Do I just need to change kernel parameter lcpu_attr=1 to enable hyperthreading ? It is currently set to 0.

Thanks

Michael

[Dennis Handly]

What HP-UX version are you using?

[michaelob]

Hi Dennis,

We are using hp-ux 11.31 with March 2011 patch bundle.

Thanks

Michael

[Rajesh K Chaurasia]

Itanium 9100 (aka Montvale) supports hyperthreading (2 threads per core). You need to enable hyperthreading in EFI and after the server boots up you can dynamically enable/disable hyperthreading by setting kernel tunable parameter lcpu_attr.

Regards

-Rajesh

[Rajesh K Chaurasia]

An update to my previous post.

Oh well, not all implementations of Itanium 9100 support hyperthreading.

Hyperthreading supported on : 9150M, 9150N, 9140M, 9140N, 9120N

Hypertheading NOT supported on: 9130M, 9110N

For details refer to Intel Itanium 9100 product specification sheet

http://www.intel.com/content/dam/doc/product-brief/high-performance-computing-itanium-9100-powering-mainframe-solutions-on-flexible-industry-standard-servers-brief.pdf

Regards

-Rajesh

[michaelob]

Hi,

Thank you for the update regarding 9100 processor which supports hyperthreading, how can tell which implementation we have installed ?

Thnaks

Michael

[Dennis Handly]

>how can tell which implementation we have installed?

Have you tried machinfo?

[michaelob]

Hi,

Just wanted to clarify that output from machinfo

3 Intel(R) Itanium 2 9100 series processors (1.59 GHz, 18 MB)
          532 MT/s bus, CPU version A1

relates to a 9140N based on the speed and cache detailed in the product brief.

Thanks

Michael