Harry (Hyeonggon) Yoo
Posts
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106- Linux Kernel Developer @ Oracle (Linux Kernel MM) (2025.02 ~ Present)
- Reviewer for the Linux Slab subsystem
- Former Intern @ NVIDIA, SK Hynix, Panmnesia (Security, MM and CXL)
- B.Sc. in Computer Science & Engineering, Chungnam National University (Class of 2025)
Opinions are my own.
My interests are:
Memory Management,
Computer Architecture,
Circuit Design,
Virtualization
Harry (Hyeonggon) Yoo
hyeyoo
Edited 1 year ago
Was working out today wearing this tshirt, suddenly someone asked me "You use Linux? I use Arch by the way..."
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@ptesarik @lkundrak @ljs @sj @vbabka @Aissen
I got a reply from Lenovo HW team. For a reason that I don't understand, he said a part of 32GB DIMM belongs to a dual channel with 8GB DIMM and the remaining part belongs to a single channel thus a separate NUMA node.
```
[...]
the summary is that the performance for the two nodes is different. Node 0 is dual channel interleaved whereas Node 1 is single channel - so this is working as designed.
[...]
```
https://forums.lenovo.com/t5/ThinkBook-Laptops/BIOS-problem-Bogus-NUMA-configuration-on-thinkbook/m-p/5260517?page=1#6212698
I got a reply from Lenovo HW team. For a reason that I don't understand, he said a part of 32GB DIMM belongs to a dual channel with 8GB DIMM and the remaining part belongs to a single channel thus a separate NUMA node.
```
[...]
the summary is that the performance for the two nodes is different. Node 0 is dual channel interleaved whereas Node 1 is single channel - so this is working as designed.
[...]
```
https://forums.lenovo.com/t5/ThinkBook-Laptops/BIOS-problem-Bogus-NUMA-configuration-on-thinkbook/m-p/5260517?page=1#6212698
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Harry (Hyeonggon) Yoo
hyeyoo
Edited 1 year ago
A few diagrams about PCIe. 1) An example PCIe topology 2) PCIe Switch and 3) Root Complex
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