OS Dev @OSdev_
Senior Engineer @Qualcomm What makes a system well-engineered? osdev-in.github.io void* Joined June 2024-
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A stolen website key puts one site at risk. eMudhra’s weak CA keys could let attackers forge HTTPS certificates for any domain. If they intercept your connection and your client still trusts those CAs, they could impersonate your bank and read or modify traffic.
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Hello you fine Internet folks, Today we are looking at Qualcomm's System Level Architecture found in the Snapdragon X2 Elite Extreme SoC and how it handles memory access from both the CPU and GPU side. Hope y'all enjoy! chipsandcheese.com/p/qualcomms-sy…
@_alwaysalexandr Interesting. But, Isn't it the same thing but with additional checks and capabilities?
Is AI good at multi threading? Personal experience is that I had to clean up a lot of mess it created. It's not bad but it increases the chances of race conditions by a lot.
@_alwaysalexandr "Do even threads require in os dev." If not threads then what? Also, you're talking about Kernel to usermode boundary. Not about threads
@VazeKshitij FSMs are used everywhere. For example in OS, it's used in thread life cycle tracking, when threads move from ready->running or any other state.
I always wondered what Priority, Preemption, QoS, CPU Affinity and NUMA actually mean when it comes to scheduling. We hear these terms separately, but they all somehow meet when the OS has to answer a simple question: “this thread is ready, where and when should I run it?” I’m going down this rabbit hole now :)
@marklucovsky Thank you! I still need to learn more about scheduling with affinity, QoS, NUMA etc.
Windows NT 3.1 had an interesting bug where starting an application with "START /REALTIME" could make the OS appear to hang. "/REALTIME" put the process in the real-time priority class, where its threads could run above normal dynamic-priority threads and potentially starve lower-priority work. Microsoft documented this as Q103475: “Starting Applications with /REALTIME May Hang Windows NT.” Interestingly, "REALTIME_PRIORITY_CLASS" still exists in Windows today, and Microsoft still warns that misuse can interfere with important system work.
@marklucovsky Is it still the same case with real time priority?
It’s crazy how advanced modern OS schedulers are. When a thread is ready, the scheduler doesn’t just find a free CPU and run it. It has to think about priority, CPU load, affinity, which core the thread ran on before, cache locality, CPU topology, and on heterogeneous systems, which type of core is a better fit. Move the thread too much and you can lose cache locality. Keep it on one busy core and you lose performance. Put background work on a high-performance core and you may waste power. And these decisions happen continuously while hundreds or thousands of threads are waking, sleeping, blocking and competing for CPU time. Scheduling today is as much about power and hardware topology as it is about sharing CPU time.
@ivanrouzanov @davepl1968 Didn't know that. Just read articles on it. Thanks!
One surprising fact about the first Windows NT: NT meant “New Technology,” and NT 3.1 wasn't built just for Windows apps. It was designed with multiple environment subsystems, supporting Win32, POSIX and character-based OS/2 apps on top of the same NT architecture. Windows was basically one personality on top of NT. Pretty wild for 1993.
Say what you will about Windows (OS), but the NT kernel really is an engineering marvel that still puts Linux to shame in many ways. The quickest way to describe it for a programmer, is NT was more like an object-oriented language, with a strong security model from day one,
@lauriewired Exact thoughts !! What's your take on ReactOS ?
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