10 Replies Latest reply on Jan 16, 2018 1:50 AM by Hitesh B-Oracle

    4 core vs. 8 core

    2985165

      Can someone comment on what determines how many cores are recognized by the system board?  A CPU reported 8 cores in a T5-2; the same CPU only reports 4 cores in a T4.

       

      Is there a way to purchase a different system board (for the T4) that will recognize all eight cores.

       

      Thank you for any information.

       

      Jason Holly

        • 1. Re: 4 core vs. 8 core
          Andris Perkons-Oracle

          T4 and T5 systems do not share the same CPUs.

          Depending on which T4 system you have, you can have up to 4 8-core SPARC T4 CPUs.

          The T5-2 has 2 16-core SPARC T5 CPUs.

           

          How many CPU cores are recognized is not dependant on the system board. On T-series servers, it is possible to set up virtual machines that are allocated a subset of all physically available cores, and this is what most probably has happened on your servers.

           

          Andris

          • 2. Re: 4 core vs. 8 core
            Hitesh B-Oracle

            First of all, the cpu  in T5-2 & T4 platform are not same.

            T5-2 uses Sparc T5 processor. And Sparc T4-(1/2/4) PLATFORM uses SPARC T4 Processor.

            SPARC T4 Processor has 8 cores embodied in single chip and each core is capable of running 8 threads.

            There is no SPARC T4 available with 4 cores. However it is likely that if using virtualisation (Ldoms) then it may not show all cores in the primary domain.

            You may wish to try booting the host in factory default mode to check the same.

            HTH

            • 3. Re: 4 core vs. 8 core
              Martin PRESSLABER

              You could always ask your ILOM how many CPUs are installed and how many cores they have...

               

              T4-1 example (1 CPU installed):

              -> show -l all /System/Processors/CPUs/ total_cores

               

                /System/Processors/CPUs/CPU_0

                  Properties:

                      total_cores = 8

               

               

              T5-8 example (8 CPUs installed):

              root@server:~# ipmitool sunoem cli 'show -l all /System/Processors/CPUs/ total_cores'

              Connected. Use ^D to exit.

              -> show -l all /System/Processors/CPUs/ total_cores

               

                /System/Processors/CPUs/CPU_0

                  Properties:

                      total_cores = 16

               

               

                /System/Processors/CPUs/CPU_1

                  Properties:

                      total_cores = 16

               

               

                /System/Processors/CPUs/CPU_2

                  Properties:

                      total_cores = 16

               

               

                /System/Processors/CPUs/CPU_3

                  Properties:

                      total_cores = 16

               

               

                /System/Processors/CPUs/CPU_4

                  Properties:

                      total_cores = 16

               

               

                /System/Processors/CPUs/CPU_5

                  Properties:

                      total_cores = 16

               

               

                /System/Processors/CPUs/CPU_6

                  Properties:

                      total_cores = 16

               

               

                /System/Processors/CPUs/CPU_7

                  Properties:

                      total_cores = 16

               

               

              -> Session closed

              Disconnected

               

              M7-8 example (4 CPUs installed)

               

              root@server:~#  ipmitool sunoem cli 'show -l all /System/Processors/CPUs/ total_cores'

              Connected. Use ^D to exit.

              -> show -l all /System/Processors/CPUs/ total_cores

               

                /System/Processors/CPUs/CPU_0

                  Properties:

                      total_cores = 32

               

               

                /System/Processors/CPUs/CPU_1

                  Properties:

                      total_cores = 32

               

               

                /System/Processors/CPUs/CPU_2

                  Properties:

                      total_cores = 32

               

               

                /System/Processors/CPUs/CPU_3

                  Properties:

                      total_cores = 32

               

               

              -> Session closed

              Disconnected

               

              IPMITOOL will only work on a primary LDOM that way...

               

              regards

              - Martin

              • 4. Re: 4 core vs. 8 core
                2985165

                Some confusion on my part. The 8 core CPU came out of a T4-2 and was placed in a T4-1 system

                • 5. Re: 4 core vs. 8 core
                  2985165

                  In regard to the T4 4core CPU

                   

                  7022520 [F] 8Core 2.85GHz System Board Assembly

                  7042220 [F] 4Core 2.85GHz System Board Assembly

                   

                  from the T4 full component list

                  • 6. Re: 4 core vs. 8 core
                    Nik

                    Hi.

                    1.  Please clear what  exactly you do and what expect.

                           Netra SPARC T4-1;  SPARC T4-1  - It's different system with different system board and hardware specifications.

                            So when you use part of full name - is not clear what you have.

                     

                    2. CPU is  not FRU for this system.  In case CPU's problem - you should replace whole board.

                         Of course you can try just replace CPU, but  many information  not available for this case.

                          ( How SB detect avaliable cores ; how SB  should  be configured for  CPU ).

                        So you can win or not...

                     

                     

                    Regards,

                       Nik.

                    • 7. Re: 4 core vs. 8 core
                      2985165

                      We have spare T4-2 systems with 8 core CPUs. We pulled a CPU out of the T4-2 and verified via the Oracle part number on the CPU that it is a 2.85Ghz T4 8 core CPU. We removed the 2.85Ghz T4 4 core CPU from the Netra T4-1 and installed the T4-2 8 core CPU. No other modifications were made to the Netra T4-1. We powered the Netra T4-1 and have noticed the iLOM only reports 4 cores and not 8 cores.

                       

                      All Oracle product literature indicates the T4 processor family is exactly the same except for the difference in the number of cores.

                       

                      We want to know how to enable the additional 4 cores without replacing the system board. Budget is tight and the Netra T4-1 are EOL as well. What is causing the Netra T4-1 to only recognize 4 cores? Is it the iLOM, is it the firmware, is it the system board? We have other Netra T4-1 systems with 8 cores but have several Netra T4-1s with 4 cores that we want to have 8 cores as well.

                      • 8. Re: 4 core vs. 8 core
                        Hitesh B-Oracle

                        This is something, which is not standard recommended practice.

                        You may lose support contract for performing chip level modification in these platform.

                        (Because CPU chips are not field replaceable unit)

                         

                        Anyway, the Netra product is different product line and we have 4 core CPU variant in Netra T4-1.

                        So, in that case you will see, what actually is available, i.e. 4 core.

                         

                        Hope this helps

                        • 9. Re: 4 core vs. 8 core
                          2985165

                          These systems are EOL and don't have and will not have a support contract for them. Upgrading it ourselves is our only option. We wanted to try a CPU upgrade first and then maybe a system board upgrade.

                           

                          I understand the NETRA is a different product line but the underlying CPUs and system board should be the same. A NETRA system is a ruggedized version of the T4-1. A T4 CPU is a T4 CPU. Something on the system board is limiting the 8core from being more than a 4core.

                           

                          That is what I'm trying to figure out. Is it the ILOM? Is it the firmware? Is it the EEPROM chip? Something somewhere is telling the system NOT to recognize the additional 4cores. That's what I need help with.

                          • 10. Re: 4 core vs. 8 core
                            Hitesh B-Oracle

                            For Netra T4-1, there is 4 core T4 CPU used for certain part number.

                            and hence there is no way to get 8 core out of 4 core T4 CPU chip.

                             

                            I would suggest you to check with local Oracle Sales team or Oracle Technical Account Manager, if they can buy back your old machines and offer you newer solutions.