topic X5680 on Linux in Mobile and Desktop Processors

X5680 on Linux

idata — Fri, 20 Aug 2010 22:02:18 GMT

I ran a dual Intel Xeon X5680 on a recent Linux kernel and in procinfo it shows up as 4 cores/siblings per chip for a total of 8 cpus.

This is a surprise since the 5680 has 6 cores per chip, and 2 threads per core.

In contrast on another box with 4 core/2 thread Xeon X5500's procinfo shows 4 cores, 8 siblings per chip for a total 16 http://www.linuxforums.org/forum/# cpus.

Any idea whats going on here?

Re: X5680 on Linux

Salem_W_Intel1 — Thu, 26 Aug 2010 21:13:19 GMT

Hi,

For better undestanding of the situation your system's having, please, provide more details:

1. What's the serverboard you're running the two Intel(R) Xeon(TM) Processor(s) X5680 on?

2. Just to be in sync., what do you mean by siblings? Are you referring to the threads?

3. I checked and there's no Intel(R) Xeon(TM) Processor X5500; see the following URL:

http://ark.intel.com

Hence, please, confirm on the model of this other Intel(R) Xeon(TM) Processor.

4. Have you run the http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=7840&ProdId=1881&lang=eng Intel(R) Processor Identification Utility from DOS to see how the cores are being detected?

Re: X5680 on Linux

idata — Thu, 26 Aug 2010 21:39:48 GMT

My mistake, I jumped the gun on this. The test was inadvertently done on a 32bit Linux kernel. When we switched to the 64 bit Kernel /proc/cpuinfo shows 24 "processors" as I was expecting.