2 Replies Latest reply on Aug 26, 2010 3:39 PM by kmand

    X5680 on Linux


      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 cpus.

      Any idea whats going on here?

        • 1. Re: X5680 on Linux


          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:




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



          4. Have you run the Intel(R) Processor Identification Utility from DOS to see how the cores are being detected?

          • 2. Re: X5680 on Linux

            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.