What does this BIOS option mean???

[IBM_THINKPAD_R51]

SO to make things short, i have 2 intel xeon 6-cores in a dual socket HP-Z800. I have 36GB of memory in hexa-channel. I put it so that each cpu has 3 sticks in its own memory bank.

 

I know what Memory Node Interleave is and i will keep that disabled.

 

But what i dont know is what the hell does NUMA Split Mode mean???? 

[Turtle Rig]

4 minutes ago, IBM_THINKPAD_R51 said:

SO to make things short, i have 2 intel xeon 6-cores in a dual socket HP-Z800. I have 36GB of memory in hexa-channel. I put it so that each cpu has 3 sticks in its own memory bank.

 

I know what Memory Node Interleave is and i will keep that disabled.

 

But what i dont know is what the hell does NUMA Split Mode mean???? 

That is going to deep into the BIOS you can fuk something up man.  Leave these settings alone or optimized defaults and what not.

[Windows7ge]

I can only throw out an educated guess but maybe @leadeater can provide a better/more correct answer.

 

NUMA nodes are effectively CPU's paired with memory banks. Depending on how the server is configured information CPU1 may need from memory could be located in CPU2's memory banks which it then needs to fetch. Depending on the task this could reduce performance. Isolating the NUMA nodes forces data for CPU1 to remain in CPU1's memory bank and CPU2's to remain in CPU2's memory bank. For tasks like virtualization this can help a lot.

 

That's just my guess by what it means when it says NUMA Split Mode.

[leadeater]

6 hours ago, IBM_THINKPAD_R51 said:

But what i dont know is what the hell does NUMA Split Mode mean???? 

It's like Threadripper and UMA versus NUMA operating modes. NUMA Split makes the OS see two NUMA nodes which effects how memory is allocated to threads and sockets, things tend to stay in the same NUMA node for a thread. If a new thread is created and allocated on the other NUMA node but needs to reference that other original thread and it's memory this is a remote call across the QPI link. Disabling NUMA Split makes all the memory appear as a single memory node which means memory can be moved between sockets as required and then reference by threads potentially increasing application performance.

 

Some thing benefit with NUMA on and some with it off. You'll have to test to know.

 

You can check what Windows sees by using Task Manager and right clicking on the CPU utilization grah and select 'Change graph to NUMA nodes'.

[IBM_THINKPAD_R51]

7 hours ago, leadeater said:

It's like Threadripper and UMA versus NUMA operating modes. NUMA Split makes the OS see two NUMA nodes which effects how memory is allocated to threads and sockets, things tend to stay in the same NUMA node for a thread. If a new thread is created and allocated on the other NUMA node but needs to reference that other original thread and it's memory this is a remote call across the QPI link. Disabling NUMA Split makes all the memory appear as a single memory node which means memory can be moved between sockets as required and then reference by threads potentially increasing application performance.

 

Some thing benefit with NUMA on and some with it off. You'll have to test to know.

 

You can check what Windows sees by using Task Manager and right clicking on the CPU utilization grah and select 'Change graph to NUMA nodes'.

But my computer already saw 2 numa nodes with it disabled

[leadeater]

4 hours ago, IBM_THINKPAD_R51 said:

But my computer already saw 2 numa nodes with it disabled

Ahh...... I dunno then lol.

[IBM_THINKPAD_R51]

55 minutes ago, leadeater said:

Ahh...... I dunno then lol.

thanks for tryin tho XD

[leadeater]

11 minutes ago, IBM_THINKPAD_R51 said:

thanks for tryin tho XD

I read the doc that explained it and it sounded much like the Threadripper modes, guess there's something more to it. I'd be interested to know what it is.

[IBM_THINKPAD_R51]

1 minute ago, leadeater said:

I read the doc that explained it and it sounded much like the Threadripper modes, guess there's something more to it. I'd be interested to know what it is.

@LinusTech @Slick NEW TECH QUICKI EPISODE