facebook/fboss
Mar 2025 – Mar 2026
11 Months active
Languages Used
C++PythonThrift
Technical Skills
C++C++ developmentNetwork ProgrammingSoftware Testingnetwork programmingnetworking
Sayeed Tasnim
PROFILE
Sayeed Tasnim
Over 11 months, Sayeed Tanvir engineered advanced network telemetry, testing, and packet processing features for the facebook/fboss repository. He developed and refactored queue management, Mirror-on-Drop, and sFlow telemetry pipelines, focusing on robust C++ and Thrift-based infrastructure. His work included building high-frequency statistics frameworks, modernizing data models for memory safety, and expanding test automation for cross-ASIC validation. Sayeed addressed protocol handling, error management, and performance monitoring, ensuring reliable, production-ready code. By integrating deep packet inspection, protocol deserialization, and system-level instrumentation, he delivered maintainable solutions that improved observability, test coverage, and operational reliability across diverse networking hardware.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
85Total
Bugs
7
Commits
85
Features
17
Lines of code
10,963
Activity Months11
Your Network
2831 peopleSame Organization
@meta.com2597
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234
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Work History
March 2026
7 Commits • 1 Features
Mar 1, 2026March 2026 performance summary for facebook/fboss focusing on MoD (Mirror-on-Drop) enhancements on XGS, IPFIX/PSAMP MoD parsing, expanded test coverage, and sampling reliability improvements. Highlights include end-to-end MoD support for MMU drops, new parsing structures, comprehensive unit tests, enhanced ACL drop verification, and stabilization of VerifySampledPacketRate tests, delivering higher visibility into drop behavior and more reliable metrics.
7 Commits • 1 Features
Mar 1, 2026March 2026 performance summary for facebook/fboss focusing on MoD (Mirror-on-Drop) enhancements on XGS, IPFIX/PSAMP MoD parsing, expanded test coverage, and sampling reliability improvements. Highlights include end-to-end MoD support for MMU drops, new parsing structures, comprehensive unit tests, enhanced ACL drop verification, and stabilization of VerifySampledPacketRate tests, delivering higher visibility into drop behavior and more reliable metrics.
March 2026
February 2026
11 Commits • 3 Features
Feb 1, 2026February 2026 fboss monthly summary: This month delivered XGS TAM telemetry enhancements and Mirror-on-Drop (MoD) capabilities for SAI SDK 13.0+ across XGS ASICs, drove cross-ASIC telemetry parity with DNX, and strengthened testing infrastructure. Key changes included enabling TAM event attributes (device_id, event_id, extensions_collector_list, packet_drop_type_mmu) and ensuring TAM objects unbind cleanly on destruction; extended MoD support with XGS-specific report types (IPFIX) and TAM configuration paths; and refactored TAM object lifecycle (creation/binding/storage) for reusability. On the testing side, MoD test infrastructure improvements and Tomahawk5 NSF cluster coverage were added. However, after roundtrip tests, TAM attributes for XGS and the XGS MoD changes were rolled back to restore stability and reproducible results. Overall, the work increased telemetry coverage and observability while preserving stability across ASICs. Technologies demonstrated include C++ TAM API usage, IPFIX reporting, ASIC-type conditional logic, reusable TAM helpers, and enhanced testing frameworks.
February 2026
11 Commits • 3 Features
Feb 1, 2026February 2026 fboss monthly summary: This month delivered XGS TAM telemetry enhancements and Mirror-on-Drop (MoD) capabilities for SAI SDK 13.0+ across XGS ASICs, drove cross-ASIC telemetry parity with DNX, and strengthened testing infrastructure. Key changes included enabling TAM event attributes (device_id, event_id, extensions_collector_list, packet_drop_type_mmu) and ensuring TAM objects unbind cleanly on destruction; extended MoD support with XGS-specific report types (IPFIX) and TAM configuration paths; and refactored TAM object lifecycle (creation/binding/storage) for reusability. On the testing side, MoD test infrastructure improvements and Tomahawk5 NSF cluster coverage were added. However, after roundtrip tests, TAM attributes for XGS and the XGS MoD changes were rolled back to restore stability and reproducible results. Overall, the work increased telemetry coverage and observability while preserving stability across ASICs. Technologies demonstrated include C++ TAM API usage, IPFIX reporting, ASIC-type conditional logic, reusable TAM helpers, and enhanced testing frameworks.
December 2025
11 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary focusing on business value and technical achievements for facebook/fboss. Delivered cross-ASIC Mirror-on-Drop (MoD) enhancements across DNX (Jericho3) and XGS (Tomahawk5) with Telemetry and Monitoring (TAM) integration, expanding reporting semantics to support SDK 13.0+ and per-ASIC behavior. Implemented XGS MoD reporting path and platform-specific dispatch, enabling IPFIX-based reports for XGS and DNX-aligned MMU/ingress reporting where applicable. Improved test infra and stability to support multi-ASIC MoD in production while maintaining qualification pace.
11 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary focusing on business value and technical achievements for facebook/fboss. Delivered cross-ASIC Mirror-on-Drop (MoD) enhancements across DNX (Jericho3) and XGS (Tomahawk5) with Telemetry and Monitoring (TAM) integration, expanding reporting semantics to support SDK 13.0+ and per-ASIC behavior. Implemented XGS MoD reporting path and platform-specific dispatch, enabling IPFIX-based reports for XGS and DNX-aligned MMU/ingress reporting where applicable. Improved test infra and stability to support multi-ASIC MoD in production while maintaining qualification pace.
December 2025
October 2025
17 Commits • 1 Features
Oct 1, 2025October 2025 Monthly Summary — FBOSS (facebook/fboss) Key features delivered: - Modernized sFlow data model with Owned structs and vector-based data to improve ownership, safety, and maintainability. - Implemented a complete sFlow deserialization pipeline (FlowSample, SampleRecord, FlowRecord, SampleDatagram, SampleDatagramV5, and SampledHeader) with integration into the FBOSS sFlow path. - Reworked sample data handling by updating SampledHeader to a vector-based representation to align with the new ownership model and reduce memory risks. Major bugs fixed: - ECN counting fix for Broadcom Jericho3 ASICs: corrected counting for packets marked with ECT1 and added tests to prevent regressions. Testing and quality improvements: - Added unit tests for sFlow SampledHeader serialization and introduced utilities to compare captured vs. expected sFlow packets, shifting verification from bytes to structured data. Overall impact and accomplishments: - Enhanced robustness and maintainability of sFlow support in the FBOSS agent, reducing memory-safety risks and enabling faster future iterations and feature work. The changes provide stronger telemetry handling and more reliable packet processing on diverse hardware. Technologies and skills demonstrated: - C++ memory ownership best practices, vector-based data modeling, protocol deserialization, test-driven development, and differential revision workflow.
October 2025
17 Commits • 1 Features
Oct 1, 2025October 2025 Monthly Summary — FBOSS (facebook/fboss) Key features delivered: - Modernized sFlow data model with Owned structs and vector-based data to improve ownership, safety, and maintainability. - Implemented a complete sFlow deserialization pipeline (FlowSample, SampleRecord, FlowRecord, SampleDatagram, SampleDatagramV5, and SampledHeader) with integration into the FBOSS sFlow path. - Reworked sample data handling by updating SampledHeader to a vector-based representation to align with the new ownership model and reduce memory risks. Major bugs fixed: - ECN counting fix for Broadcom Jericho3 ASICs: corrected counting for packets marked with ECT1 and added tests to prevent regressions. Testing and quality improvements: - Added unit tests for sFlow SampledHeader serialization and introduced utilities to compare captured vs. expected sFlow packets, shifting verification from bytes to structured data. Overall impact and accomplishments: - Enhanced robustness and maintainability of sFlow support in the FBOSS agent, reducing memory-safety risks and enabling faster future iterations and feature work. The changes provide stronger telemetry handling and more reliable packet processing on diverse hardware. Technologies and skills demonstrated: - C++ memory ownership best practices, vector-based data modeling, protocol deserialization, test-driven development, and differential revision workflow.
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly work summary for facebook/fboss: Delivered Egress Mirror Packet Truncation Feature, updated production features enumeration in Thrift, enabling controlled egress mirror truncation for diagnostics and security. This work involved a targeted Thrift file update and a focused commit to production features, with emphasis on safe rollout and compatibility.
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly work summary for facebook/fboss: Delivered Egress Mirror Packet Truncation Feature, updated production features enumeration in Thrift, enabling controlled egress mirror truncation for diagnostics and security. This work involved a targeted Thrift file update and a focused commit to production features, with emphasis on safe rollout and compatibility.
September 2025
August 2025
6 Commits • 2 Features
Aug 1, 2025August 2025 (facebook/fboss): Strengthened performance validation and traffic mirroring reliability through targeted test work and a critical stat-ID fix. Key features delivered include high-frequency CPU statistics polling tests and enhancements, and mirroring tests enhancements with IPv6 support. Major bugs fixed include correcting BCM BST stat IDs for high-frequency polling. Overall impact: improved accuracy of CPU polling under load, expanded visibility into sFlow/ERSPAN mirroring on Jericho3, and stronger test automation. Technologies/skills demonstrated: test automation, performance testing, sFlow/ERSPAN, Jericho3, IPv6, test refactoring, and constants-driven utilities.
August 2025
6 Commits • 2 Features
Aug 1, 2025August 2025 (facebook/fboss): Strengthened performance validation and traffic mirroring reliability through targeted test work and a critical stat-ID fix. Key features delivered include high-frequency CPU statistics polling tests and enhancements, and mirroring tests enhancements with IPv6 support. Major bugs fixed include correcting BCM BST stat IDs for high-frequency polling. Overall impact: improved accuracy of CPU polling under load, expanded visibility into sFlow/ERSPAN mirroring on Jericho3, and stronger test automation. Technologies/skills demonstrated: test automation, performance testing, sFlow/ERSPAN, Jericho3, IPv6, test refactoring, and constants-driven utilities.
July 2025
15 Commits • 2 Features
Jul 1, 2025July 2025 performance summary for facebook/fboss: Delivered two core enhancements that materially boost observability, configurability, and reliability of network telemetry. The initiatives establish a foundation for near real-time health signals and QoS tuning, enabling faster issue detection and data-driven optimization across the fleet. Key features delivered: - High Frequency Stats Collection Framework: built core infrastructure for collecting and reporting high-frequency statistics (HF stats) for BcmHandler, including PFC port statistics, per-iteration data collection, and robustness improvements. Introduced start/stop HF stats endpoints and Thrift hardware HF stats struct to standardize data interchange. - High Frequency Watermark Stats Management and Configurability: unified, configurable collection and reporting of high-frequency watermark statistics with port-level gathering, change-detection optimization, selective synchronization, vector-based collection, and memory/config flags. Added per-port watermark stats with flags for data size and active-interval behavior. Major bugs fixed: - Hardened error handling: Throw FbossError when no VLAN is found for an aggregate port, improving stability in edge cases. - Test and configuration hygiene: updated AgentAQM tests to reflect Ecn threshold logic (AQM test rename) and removed a PG-configured check for high-frequency port watermark stats to align runtime behavior with configuration. Overall impact and accomplishments: - Significantly improved observability with high-frequency telemetry, enabling proactive troubleshooting and faster QoS tuning. - Laid the groundwork for scalable, configurable telemetry pipelines across FBOSS, reducing MTTR and enabling data-driven decisions. - Improved reliability and correctness of high-frequency statistics collection and reporting through robust error handling and streamlined configuration. Technologies/skills demonstrated: - C++ core infrastructure, threading/concurrency, and system-level instrumentation. - Thrift-based data structures for HF stats and inter-component communication. - Per-port telemetry pipelines (PFC statistics, watermark metrics) and feature flag/config-driven behavior. - Testing and maintenance of telemetry features, including test updates and behavior alignment.
15 Commits • 2 Features
Jul 1, 2025July 2025 performance summary for facebook/fboss: Delivered two core enhancements that materially boost observability, configurability, and reliability of network telemetry. The initiatives establish a foundation for near real-time health signals and QoS tuning, enabling faster issue detection and data-driven optimization across the fleet. Key features delivered: - High Frequency Stats Collection Framework: built core infrastructure for collecting and reporting high-frequency statistics (HF stats) for BcmHandler, including PFC port statistics, per-iteration data collection, and robustness improvements. Introduced start/stop HF stats endpoints and Thrift hardware HF stats struct to standardize data interchange. - High Frequency Watermark Stats Management and Configurability: unified, configurable collection and reporting of high-frequency watermark statistics with port-level gathering, change-detection optimization, selective synchronization, vector-based collection, and memory/config flags. Added per-port watermark stats with flags for data size and active-interval behavior. Major bugs fixed: - Hardened error handling: Throw FbossError when no VLAN is found for an aggregate port, improving stability in edge cases. - Test and configuration hygiene: updated AgentAQM tests to reflect Ecn threshold logic (AQM test rename) and removed a PG-configured check for high-frequency port watermark stats to align runtime behavior with configuration. Overall impact and accomplishments: - Significantly improved observability with high-frequency telemetry, enabling proactive troubleshooting and faster QoS tuning. - Laid the groundwork for scalable, configurable telemetry pipelines across FBOSS, reducing MTTR and enabling data-driven decisions. - Improved reliability and correctness of high-frequency statistics collection and reporting through robust error handling and streamlined configuration. Technologies/skills demonstrated: - C++ core infrastructure, threading/concurrency, and system-level instrumentation. - Thrift-based data structures for HF stats and inter-component communication. - Per-port telemetry pipelines (PFC statistics, watermark metrics) and feature flag/config-driven behavior. - Testing and maintenance of telemetry features, including test updates and behavior alignment.
July 2025
June 2025
2 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for facebook/fboss focusing on two key enhancements: testing infrastructure consolidation and high-frequency statistics collection configuration. These changes tighten test coverage, reduce maintenance overhead, and boost observability, delivering business value through faster release readiness and deeper performance insights.
June 2025
2 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for facebook/fboss focusing on two key enhancements: testing infrastructure consolidation and high-frequency statistics collection configuration. These changes tighten test coverage, reduce maintenance overhead, and boost observability, delivering business value through faster release readiness and deeper performance insights.
May 2025
6 Commits • 2 Features
May 1, 2025May 2025 was focused on delivering QoS test infrastructure and ECN-related validation for facebook/fboss, with a targeted bug fix to improve code correctness. The work emphasizes cross-platform ECN/scenario coverage, VOQ switch test robustness, and maintainability of test configurations.
6 Commits • 2 Features
May 1, 2025May 2025 was focused on delivering QoS test infrastructure and ECN-related validation for facebook/fboss, with a targeted bug fix to improve code correctness. The work emphasizes cross-platform ECN/scenario coverage, VOQ switch test robustness, and maintainability of test configurations.
May 2025
April 2025
3 Commits • 1 Features
Apr 1, 2025April 2025: Facebook/fboss AQM Testing Framework Improvements delivered to strengthen QA coverage, reliability, and end-to-end validation of AQMs. Key work included refactoring and organizing AQM test code for readability, ensuring statistics are updated before sending packets to improve accuracy in queue buildup tests, and introducing a mechanism to wait for positive packet counts to prevent overflow. Added a new end-to-end ECN traffic test in the Agent AQM module to validate behavior with ECN and no drops. These changes reduce regression risk in AQM paths and enable more deterministic QA cycles in production-like scenarios.
April 2025
3 Commits • 1 Features
Apr 1, 2025April 2025: Facebook/fboss AQM Testing Framework Improvements delivered to strengthen QA coverage, reliability, and end-to-end validation of AQMs. Key work included refactoring and organizing AQM test code for readability, ensuring statistics are updated before sending packets to improve accuracy in queue buildup tests, and introducing a mechanism to wait for positive packet counts to prevent overflow. Added a new end-to-end ECN traffic test in the Agent AQM module to validate behavior with ECN and no drops. These changes reduce regression risk in AQM paths and enable more deterministic QA cycles in production-like scenarios.
March 2025
6 Commits • 1 Features
Mar 1, 2025March 2025 performance review for facebook/fboss: Delivered enhanced queue management with a robust testing framework to validate per-queue QoS behavior. Implementations include ECN threshold per queue, WRED per-queue drop testing coverage, AQM threshold validation in tests, and packet-based performance verification to ensure reliable user-facing queue performance. Completed a stability-focused refactor converting SwitchConfig pointers to references. Fixed a critical symbol resolution blocker by correcting the resolveNeighborAndProgramRoutes typo, eliminating build/test failures. These efforts improved QoS guarantees, expanded test coverage, and reduced production risk.
6 Commits • 1 Features
Mar 1, 2025March 2025 performance review for facebook/fboss: Delivered enhanced queue management with a robust testing framework to validate per-queue QoS behavior. Implementations include ECN threshold per queue, WRED per-queue drop testing coverage, AQM threshold validation in tests, and packet-based performance verification to ensure reliable user-facing queue performance. Completed a stability-focused refactor converting SwitchConfig pointers to references. Fixed a critical symbol resolution blocker by correcting the resolveNeighborAndProgramRoutes typo, eliminating build/test failures. These efforts improved QoS guarantees, expanded test coverage, and reduced production risk.
March 2025
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Quality Metrics
Correctness92.6%
Maintainability85.0%
Architecture87.2%
Performance84.0%
AI Usage48.0%
Skills & Technologies
Programming Languages
C++PythonThrift
Technical Skills
API designC++C++ developmentData SerializationNetwork ProgrammingPythonSoftware DevelopmentSoftware TestingTestingThriftUnit Testingalgorithm optimizationbackend developmentcode refactoringconcurrent programming
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