Posts
499
Following
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Followers
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A relatively new professional kernel hacker, born in August 6, 2000, and living in Korea (South!).

- Linux Kernel Developer @ Oracle (Linux Kernel MM) (2025.02 ~ Present)
- Reviewer for the Linux Slab & Reverse Mapping 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
hyeyoo

Harry (Hyeonggon) Yoo

Edited 1 year ago
Visiting Scholar at Purdue University, West Lafayette, Indiana State (2024.01.04 ~ 2024.02.24)
Good bye Purdue University!

It has been so intense, now suffering from jet lag and getting back to real life.
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hyeyoo

Harry (Hyeonggon) Yoo

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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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ptesarik@fosstodon.org
Edited 1 year ago
@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
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hyeyoo

Harry (Hyeonggon) Yoo

At this point obviously I'm here to drink more
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @hyeyoo
Feeling like I'm gaining weight :(
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @hyeyoo
I love drinking
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hyeyoo

Harry (Hyeonggon) Yoo

First week at purdue
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hyeyoo

Harry (Hyeonggon) Yoo

when @ljs is low on cat
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
Edited 1 year ago
@vbabka @ljs @lkundrak
yeah I don't (try not to) care
It's now just an empty bottle :)
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
@ljs @lkundrak @vbabka
Here we go!
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @Andi
@Andi *sending a screenshot of the picture you've sent to GM being sent to me*
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hyeyoo

Harry (Hyeonggon) Yoo

At OSS Festival last week (in Seoul)
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hyeyoo

Harry (Hyeonggon) Yoo

War and Peace
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hyeyoo

Harry (Hyeonggon) Yoo

Shared bicycles (not a biker gang)
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 1 year ago
I WILL (NEVER) DRINK AGAIN
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 1 year ago
dude that's an undefined behavior.
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hyeyoo

Harry (Hyeonggon) Yoo

GERMAN VILLAGE IN KOREA
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hyeyoo

Harry (Hyeonggon) Yoo

Where are you going sir
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hyeyoo

Harry (Hyeonggon) Yoo

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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hyeyoo

Harry (Hyeonggon) Yoo

This is why I go to the gym
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