microsoft/openvmm
Apr 2025 – Sep 2025
2 Months active
Languages Used
Rust
Technical Skills
Kernel DevelopmentSystem ProgrammingVirtualizationPerformance OptimizationStorage Systems
Feng Liang
PROFILE
Feng Liang
Worked on the microsoft/openvmm repository to enhance storage and virtualization reliability using Rust and system programming expertise. Delivered a targeted fix for IO provisioning failures in hardware-isolated TDX Windows VMs by conditionally increasing the swiotlb buffer size, improving DVD provisioning stability without impacting other VM types. Later, implemented a dynamic poll_mode_queue_depth optimization for remote SCSI storage, selectively boosting IOPS for specific controller instances while preserving local disk behavior. Both changes were validated with benchmarks and careful scoping to minimize risk. The work demonstrated depth in kernel development, performance optimization, and storage systems, focusing on precise, production-safe improvements to virtualization infrastructure.
Overall Statistics
Feature vs Bugs
50%Features
Repository Contributions
2Total
Bugs
1
Commits
2
Features
1
Lines of code
82
Activity Months2
Your Network
4774 peopleSame Organization
@microsoft.com4720
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Shared Repositories
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Work History
September 2025
1 Commits • 1 Features
Sep 1, 2025Monthly performance summary for 2025-09 focused on storage performance optimization for microsoft/openvmm. Delivered a targeted remote SCSI poll_mode_queue_depth optimization to boost IOPS for remote disks with a specific SCSI controller, while preserving local-disk behavior and avoiding unintended side effects.
1 Commits • 1 Features
Sep 1, 2025Monthly performance summary for 2025-09 focused on storage performance optimization for microsoft/openvmm. Delivered a targeted remote SCSI poll_mode_queue_depth optimization to boost IOPS for remote disks with a specific SCSI controller, while preserving local-disk behavior and avoiding unintended side effects.
September 2025
April 2025
1 Commits
Apr 1, 2025April 2025 – Microsoft/OpenVMM: Key stability improvement for IO provisioning in hardware-isolated CVMs under TDX Windows VMs. Implemented a targeted swiotlb buffer size adjustment to 8MB to fix DVD provisioning IO failures, applied conditionally by VM isolation type, improving reliability and reducing provisioning failures in production. Commit: 8903632c5f10ee44689d9822b15020c554ad588a (“openhcl_boot: update swiotlb to 8MB on hardware isolated CVMs (#1116)”).
April 2025
1 Commits
Apr 1, 2025April 2025 – Microsoft/OpenVMM: Key stability improvement for IO provisioning in hardware-isolated CVMs under TDX Windows VMs. Implemented a targeted swiotlb buffer size adjustment to 8MB to fix DVD provisioning IO failures, applied conditionally by VM isolation type, improving reliability and reducing provisioning failures in production. Commit: 8903632c5f10ee44689d9822b15020c554ad588a (“openhcl_boot: update swiotlb to 8MB on hardware isolated CVMs (#1116)”).
Activity
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Quality Metrics
Correctness80.0%
Maintainability80.0%
Architecture80.0%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Rust
Technical Skills
Kernel DevelopmentPerformance OptimizationStorage SystemsSystem ProgrammingVirtualization
Repositories Contributed To
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