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Onur Filiz

@onur.filiz.dev

Principal Software Engineer @Microsoft.com CoreOS. I work on #Azure, #Windows, #Linux, #virtualization, containers, storage, networking. Ex-AWS and Nortel. Science, #demoscene, books and gaming. Also https://linkedin.com/in/ofiliz. Opinions my own.

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17.11.2024
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Latest posts by Onur Filiz @onur.filiz.dev

This is just Windows client revenue shifting from per-user licensing to subscription licensing and cloud.

W&D also does not include Gaming, Windows 365 / VDI, Windows Server, Windows VMs on Azure, etc. which all run Windows. We'd have to add all those up to reach a number comparable to old metrics.

05.01.2026 10:30 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

This seems to be a misunderstanding. As of FY25, "Windows & Devices" includes only the Windows client revenue sold through the OEM channel (i.e. consumer PCs). It does not include Windows commercial revenue: volume licensing and cloud licenses, which are now reported under "M365 Commercial".

05.01.2026 10:05 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

WSL runs microVMs, same tech that was initially developed for running hw-virtualized containers (aka Hyper-V โ€œXenonโ€ containers) on Windows. It exposes a minimal modern (โ€œborn in the cloudโ€) virtual motherboard, plus state mirroring between the two kernels to keep them in-sync. Really cool stuff.

25.11.2025 01:01 ๐Ÿ‘ 7 ๐Ÿ” 3 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Preview
Groove City

Support by listening. He currently has 3,000 monthly listeners. Make it 300,000.

open.spotify.com/album/1K9kvI...

27.12.2025 21:39 ๐Ÿ‘ 4 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
Inside Azure Innovations with Mark Russinovich Join Mark Russinovich, CTO and Technical Fellow of Microsoft Azure. Mark will take you on a tour of the latest innovations in Azure architecture and explain how Azure enables intelligent, modern, and ...

This enables secure and efficient workload orchestration in right-sized microVMs.

Watch @markrussinovich.bsky.social explain it all in "Inside Azure Innovations" (@ 15:45):
ignite.microsoft.com/en-US/sessio... [3/3]

02.12.2025 01:47 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Manifold is Azure's AI infrastructure orchestrator. It uses the new Direct Virtualization feature to securely and efficiently run its workloads.

Manifold is Azure's AI infrastructure orchestrator. It uses the new Direct Virtualization feature to securely and efficiently run its workloads.

direct access to hardware accelerated devices such as GPUs for full performance.

In Direct Virtualization, the parent orchestrator VM can ask the hypervisor to take its CPU, memory and device resources, and create child VMs with those resources to run untrusted workloads it directly controls. [2/3]

02.12.2025 01:47 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Comparison of direct virtualization and nested virtualization. In direct virtualization, the guest does not run a nested hypervisor and can give its child VMs direct access to the hardware.

Comparison of direct virtualization and nested virtualization. In direct virtualization, the guest does not run a nested hypervisor and can give its child VMs direct access to the hardware.

We've announced a new feature called "Direct Virtualization" at #MSIgnite.

We want containers to be 1st-class citizens in #Microsoft #Azure, give container and application orchestrators the ability to run untrusted or confidential workloads securely with hardware virtualization, and give them [1/3]

02.12.2025 01:47 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

...your code in a child VM on top of a nested hypervisor, which requires maintenance and comes with significant performance penalties.
With DV, you can now run child VMs inside your VM using the Azure hypervisor, with full performance parity and device acceleration. No nested hypervisor required.

25.11.2025 22:24 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Inside Azure Innovations with Mark Russinovich Join Mark Russinovich, CTO and Technical Fellow of Microsoft Azure. Mark will take you on a tour of the latest innovations in Azure architecture and explain how Azure enables intelligent, modern, and ...

We've announced a new feature called "Direct Virtualization" at Ignite. The only acceptable security boundary in Azure to run untrusted code is virtualization. What if you, as a customer, also want to run code in isolation? Conventional answer is to run...

ignite.microsoft.com/en-US/sessio... 15:40

25.11.2025 22:24 ๐Ÿ‘ 6 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

WSL runs microVMs, same tech that was initially developed for running hw-virtualized containers (aka Hyper-V โ€œXenonโ€ containers) on Windows. It exposes a minimal modern (โ€œborn in the cloudโ€) virtual motherboard, plus state mirroring between the two kernels to keep them in-sync. Really cool stuff.

25.11.2025 01:01 ๐Ÿ‘ 7 ๐Ÿ” 3 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Preview
โ€˜Itโ€™s a Messโ€™: A Brain-Bending Trip to Quantum Theoryโ€™s 100th Birthday Party | Quanta Magazine Hundreds of physicists (and a few journalists) journeyed to Helgoland, the birthplace of quantum mechanics, and grappled with what they have and havenโ€™t learned about reality.

Happy 100th birthday, quantum mechanics!

13.09.2025 15:46 ๐Ÿ‘ 40 ๐Ÿ” 10 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 1
Church sign "Imagine all the people living in peace - John Lennon"

Church sign "Imagine all the people living in peace - John Lennon"

The local church demonstrates extreme selective quoting.

๐ŸŽต Imagine there is no hell or heaven ... no religion too... Worship at 10.

02.09.2025 03:57 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

There is a "Skype dial pad" feature in the Teams app (both Windows and iOS), but it is just a link to calling.web.skype.com.

27.08.2025 20:10 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Moving from Skype to Microsoft Teams Free - Microsoft Support

Skype the brand is dead, but Skype the product is still alive; it just merged into Teams. All accounts, contacts, chats, credits etc. are still available in Teams.

27.08.2025 19:45 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Preview
Ending USB Type-Cยฎ Port Confusion: How Windows 11 WHCP Delivers Consistent Performance on Certified Devices Confused by blank displays or missing features on your USB-C ports? Not all ports are created equal. Learn why even the newest Windows 11 PCs can fail...

Nice! Windows now enforces much higher USB-C feature and performance standards than what USB-IF and USB specs allow. Every USB-C port on every new (24H2) Windows PC supports displays, chargers and data.

techcommunity.microsoft.com/blog/microso...

19.06.2025 18:43 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Preview
Bill Gates tears into Elon Musk for being โ€˜involved in the deaths of the worldโ€™s poorest childrenโ€™ Gates said Musk put USAID funding in the โ€œwood chipper.โ€

Bill Gates tears into Elon Musk for being โ€œinvolved in the deaths of the worldโ€™s poorest children.โ€ Heโ€™s also put a 20-year deadline on giving away virtually all of his wealth www.theverge.com/news/663322/...

08.05.2025 21:35 ๐Ÿ‘ 138 ๐Ÿ” 12 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 1

I left Amazon because I hated the politics and bureaucracy there, but I was still proud of the work we did. Now, this, just makes me feel sick.

08.04.2025 04:51 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Preview
Trump Store Welcome to Trump Store, the official retailer of the Trump Organization. We are thrilled to offer the very latest in Trump branded merchandise, apparel, headwear, gifts and much more - all made in Ame...

...and now this. Official Trump Store on Amazon. There is no limit to how deep Amazon will kiss his ass if it gives them an advantage.
www.amazon.com/stores/Trump...

08.04.2025 04:12 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Preview
Amazon to stream Trumpโ€™s โ€˜The Apprenticeโ€™ reality TV series | CNN Business โ€œThe Apprentice,โ€ the NBC reality show that propelled Donald Trump from real estate mogul to TV personality, is getting the streaming treatment at Amazonโ€™s Prime Video.

Amazon (really #Magazon at this point) is openly bribing the new royal family anyway they can. Zero principles, zero backbone.

www.cnn.com/2025/03/10/m...

31.03.2025 19:20 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

So youโ€™ve reached the bargaining stage. Iโ€™ve been stuck in depression since January.

01.03.2025 18:19 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

it looks like Microsoft CEO Satya Nadella is notably absent from Trumpโ€™s inauguration ๐Ÿค”

20.01.2025 17:37 ๐Ÿ‘ 311 ๐Ÿ” 14 ๐Ÿ’ฌ 21 ๐Ÿ“Œ 5
Fortune cookie with the text "You will have a happy adventure soon."

Fortune cookie with the text "You will have a happy adventure soon."

A note of gratitude as we welcome 2025.

I've kept this fortune cookie slip in my home office for the past 20 years. It's from our first team lunch after joining Microsoft in late 2004.

Finding peace, meaning and purpose in your work is a blessing.

May 2025 bring you your own happy new adventures.

07.01.2025 08:49 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

XPS isnโ€™t dead. It is just being rebranded as โ€œMaxโ€, starting with the next generation in mid-2025.

07.01.2025 01:38 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0
Code snippet showing GitHub Copilot auto-complete the word "#define" to an entire macro, reading my mind.

Code snippet showing GitHub Copilot auto-complete the word "#define" to an entire macro, reading my mind.

I have a basic understanding of how LLMs work, so I realize calling this "intelligence" would be akin to seeing ghosts in a teacup. But from a strictly practical get-stuff-done point of view, GitHub #Copilot surprises me a few times a day by practically reading my mind.

Note I only typed "#define".

22.12.2024 21:12 ๐Ÿ‘ 4 ๐Ÿ” 1 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0
A black and white photo of Max Planck. His arms are crossed and he is looking at the camera. Planck has a substantial mustache and his hair is receding. He is wearing a heavy, dark suit with a high-collared white shirt and a small black bowtie.

A black and white photo of Max Planck. His arms are crossed and he is looking at the camera. Planck has a substantial mustache and his hair is receding. He is wearing a heavy, dark suit with a high-collared white shirt and a small black bowtie.

Happy #QuantumDay to all who celebrate!

Max Planck submitted work on blackbody radiation to the German Physical Society #OTD in 1900.

His novel โ€œquantum hypothesisโ€ suggested that matter emits and absorbs light with frequency f only in discrete chunks of energy E=hf. ๐Ÿงช โš›๏ธ (1/n)

Image: AIP

14.12.2024 15:06 ๐Ÿ‘ 295 ๐Ÿ” 98 ๐Ÿ’ฌ 8 ๐Ÿ“Œ 6

That's the beauty of incremental improvements. I enjoy the simplicity, the ROI, the craft, as much as those shiny big projects. We overstate impact of "new". Impact is putting in that extra effort in everyday work, making the right engineering trade-offs, wherever you can find it. 2 MiBs at a time.

03.12.2024 21:36 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

On a typical Windows client, savings amount to ~2MiB of nonpaged pool. Not much. When you install the Windows 11 24H2 update, you won't notice it. On scale, for 1.5 billion eligible Windows clients, these 20 lines save 3 PiBs (~2^51) of memory globally. And I've done it 3 times already this year.

03.12.2024 21:36 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Simply growing it would "fix the bug". But at Microsoft's scale, every line of code impacts tens, hundreds of millions of people. One-size-fits-all, doesn't. So, I wrote a heuristic that adjusts the buffer size dynamically based on the OS SKU, processor count, memory size, etc. 20 lines in an hour.

03.12.2024 21:36 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

The hypervisor runs everywhere nowadays, from Xbox to Azure, ranging from hw with a few cores and MBs of memory, to giants in Azure with 100s of cores and TBs of memory. It also runs on Windows 10/11, where it's the foundation for virtualization-based security. The buffer needed to grow for Azure.

03.12.2024 21:36 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Case in point, when I restarted in the Microsoft CoreOS team last year, my 1st task was a 1-liner bugfix for the hypervisor diagnostic log circular buffer size. The buf needs to stay resident in memory and be large enough to ensure no logs are dropped while a thread flushes it to persistent storage.

03.12.2024 21:36 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0