Linux networking, NFS, AI inference, distributed systems, and C++ explained through practical examples and primary sources.https://palashvij.pages.dev/https://palashvij.pages.dev/writing/bounded-blocking-queue/https://palashvij.pages.dev/writing/bounded-blocking-queue/Build a small C++ integer queue with explicit capacity, condition-variable predicates, graceful close, and defined producer/consumer behavior. Understand what the example leaves out.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/conntrack-nat/https://palashvij.pages.dev/writing/conntrack-nat/Understand how Linux connection tracking records flows, how NAT chooses and reuses mappings, and how to diagnose state without confusing it with firewall policy.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/consistent-hashing/https://palashvij.pages.dev/writing/consistent-hashing/Learn how consistent hashing assigns keys, why virtual nodes improve distribution, and what happens on node failure. Explore placement in a deterministic hash-ring lab.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/continuous-batching/https://palashvij.pages.dev/writing/continuous-batching/Learn how iteration-level scheduling admits and retires LLM requests, why token budgets matter, and how to measure throughput without sacrificing first-token or streaming latency.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/cpp-atomics-ordering/https://palashvij.pages.dev/writing/cpp-atomics-ordering/Understand atomicity, release/acquire publication, relaxed counters, and object lifetime. Use a complete one-shot example without mistaking atomics for a general lock-free design.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/epoll-readiness/https://palashvij.pages.dev/writing/epoll-readiness/Understand Linux epoll readiness semantics, level- versus edge-triggered handling, EAGAIN, writable interest, and connection lifetime pitfalls in event-driven servers.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/hung-nfs-mount/https://palashvij.pages.dev/writing/hung-nfs-mount/Diagnose a stuck Linux NFS operation without unsafe remount advice. Separate process waits, RPC recovery, network reachability, server health, and mount semantics.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/kv-cache-memory/https://palashvij.pages.dev/writing/kv-cache-memory/Calculate KV cache bytes per token from layers, KV heads, precision, and context. Account for concurrency and block allocation without confusing estimates with GPU measurements.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/linux-packet-journey/https://palashvij.pages.dev/writing/linux-packet-journey/Trace a conventional receive path from NIC queues and DMA through NAPI, IP, TCP, and the application—with execution context and observation points at every stage.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/ls-on-nfs/https://palashvij.pages.dev/writing/ls-on-nfs/Follow a directory listing from userspace to VFS, the NFS client, RPC, and the server—and learn why a slow listing is not automatically a slow READDIR.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/memory-reclaim-oom/https://palashvij.pages.dev/writing/memory-reclaim-oom/Distinguish reclaim, cache eviction, swapping, cgroup limits, and OOM kills. Use memory and pressure observations without treating low free memory as a diagnosis.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/nfs-client-caching/https://palashvij.pages.dev/writing/nfs-client-caching/Separate NFS directory, attribute, and data caching. Understand close-to-open behavior, rsize/wsize, writeback, and what caching changes mean for correctness and performance.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/nfsv3-rpc-xdr/https://palashvij.pages.dev/writing/nfsv3-rpc-xdr/Understand the NFSv3 mount and request path, XDR encoding, file handles, stable writes, and the limits of statelessness. Compare the right boundaries with NFSv4.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/numa-networking/https://palashvij.pages.dev/writing/numa-networking/Distinguish NIC locality, IRQ affinity, process affinity, and memory placement. Design a controlled NUMA networking comparison without inventing universal latency penalties.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/packet-drops-retransmissions/https://palashvij.pages.dev/writing/packet-drops-retransmissions/Locate packet loss across NIC, kernel, TCP, and application layers using counter deltas and scoped observations. Avoid confusing retransmissions with proof of NIC drops.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/page-cache-writeback/https://palashvij.pages.dev/writing/page-cache-writeback/Follow buffered reads and writes through the Linux page cache, dirty-page accounting, writeback, and synchronization. Measure useful work without confusing RAM speed with durability.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/paged-attention/https://palashvij.pages.dev/writing/paged-attention/Understand how PagedAttention separates logical token order from physical KV storage, reduces allocation waste, and enables sharing without making attention cost disappear.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/prefill-decode/https://palashvij.pages.dev/writing/prefill-decode/Separate prompt prefill from autoregressive decode, time to first token from inter-token latency, and compute-bound work from memory and communication limits.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/prefix-caching/https://palashvij.pages.dev/writing/prefix-caching/Understand token-prefix identity, reusable KV blocks, cache-key compatibility, and prefix-cache measurement. Learn why a cache hit mainly changes prefill, not future decode work.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/quorums-stale-reads/https://palashvij.pages.dev/writing/quorums-stale-reads/Understand replica-set intersection, asynchronous replication, failed writes, and the limits of quorum arithmetic. Explore stale reads in a deterministic single-writer lab.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/retries-backpressure/https://palashvij.pages.dev/writing/retries-backpressure/Design retries with deadlines, jitter, idempotency, and budgets. Combine bounded queues and load shedding to prevent transient failures from becoming sustained overload.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/rss-rps-rfs-xps/https://palashvij.pages.dev/writing/rss-rps-rfs-xps/Separate hardware queue selection, software CPU steering, application locality, and transmit queue selection before deciding what to tune.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/tail-latency/https://palashvij.pages.dev/writing/tail-latency/Understand nearest-rank latency percentiles, sample-size limits, coordinated omission, and benchmark methodology. Analyze a concrete sample in the browser.Sun, 15 Nov 2026 00:00:00 GMThttps://palashvij.pages.dev/writing/tcp-buffer-tuning/https://palashvij.pages.dev/writing/tcp-buffer-tuning/Diagnose TCP window limits using bandwidth-delay product and socket observations. Understand Linux buffer controls without applying universal sysctl values.Sun, 15 Nov 2026 00:00:00 GMT