A professional Linux technology community and learning platform covering the kernel, memory management, process management, file system and I/O, performance tuning, device drivers, virtualization, and cloud computing.
This article explains how PCIe width, speed, Max Payload Size, and Max Read Request affect network adapter performance, shows how to query and adjust these attributes with lspci and setpci, and provides formulas and examples for calculating the resulting PCIe bandwidth limits.
The article explains what memory semantics means in modern data‑center contexts, compares Infiniband and CXL definitions, clarifies load/store and DMA operations, and highlights the distinction between memory space and memory access with concrete examples and references.
The article reviews ten years of RDMA development, tracing its origins, the rise and pitfalls of RoCEv1/v2, alternative approaches like iWARP and Cisco usNIC, and recent modernizations such as AWS SRD, Google Falcon and UltraEthernet, highlighting why protocol design choices have repeatedly stalled industry progress.
Didi migrated its massive PB‑scale log data from Elasticsearch to ClickHouse, redesigning storage with separate Log and Trace clusters, optimizing partition and sorting keys, introducing native TCP connectors, and revamping HDFS cold‑hot separation, achieving up to four‑fold query speed gains and 30% lower hardware costs.
This article examines how Xline performs safe cluster membership changes, comparing Joint Consensus and single‑step approaches, and provides a detailed source‑code walkthrough of leader and follower handling, configuration commits, node addition, removal, and the integration with the Curp protocol.
This article explains how Ethernet storage networks handle congestion by detailing MAC learning methods, lossless traffic classification over VXLAN using DSCP and ECN, PFC flow control, congestion notification, troubleshooting steps, and preventive measures, supported by diagrams and industry references.
The article examines high‑level strategies for preventing and recovering from congestion in lossless Ethernet storage networks, including disconnecting faulty devices, early frame dropping, traffic isolation, endpoint notifications, rate limiting, pause‑timeout, PFC watchdog mechanisms, detailed Cisco configuration commands, and the benefits and limitations of each approach.
A port alarm revealed a missing Java process, which was later traced to an OOM kill triggered by vim loading a 37 GB nginx log into an 8 GB container, illustrating how editor behavior and Linux's OOM killer can unexpectedly terminate critical services.
This article explains a step‑by‑step methodology for detecting, diagnosing, and resolving congestion in lossless Ethernet storage networks, covering severity levels, spine‑leaf troubleshooting workflows, remote monitoring, comparative analysis of pause‑frame metrics, and real‑world case studies that illustrate the impact of over‑utilization and mixed traffic on network performance.
The article surveys the 40‑year history of the Free Software Foundation, hacker culture, the GPL licenses, the rise of Linux and open‑source movements, examines corporate responses from IBM, Microsoft and Google, and outlines a wide range of interdisciplinary research questions for the open‑source ecosystem.
