ASP.NET Core remains one of the most efficient frameworks for building scalable web applications. This guide walks through deploying an ASP.NET Core MVC application to Azure App Service using Visual Studio — the quickest path from local development to production. Prerequisites You’ll need: An active Azure subscription (free tier accounts work fine for testing) Visual…
When you need to debug kernel behavior without full instrumentation frameworks, module parameters offer a pragmatic shortcut. Rather than immediately reaching for perf, kprobes, or eBPF, you can add simple toggles and state tracking directly in the code you’re investigating, then control them at runtime through sysfs. Frameworks like perf, kprobes, and eBPF are powerful…
QEMU/KVM networking operates across multiple layers — TAP devices, QEMU’s packet queuing, virtio descriptors, and kernel bypass mechanisms. Understanding this stack is essential for debugging connectivity issues and tuning performance in production environments. TAP Device Fundamentals TAP (TUN/TAP) devices create a bridge between the guest and host network stack. A typical QEMU/KVM configuration looks like:…
Most popular task monitoring tools (top, iotop, procfs) sample disk I/O information at granularity limited by kernel timer frequency—typically once per second. This sampling rate misses short-lived I/O bursts and makes it difficult to accurately measure which tasks are truly I/O bound. eBPF and kernel tracepoints let you capture microsecond-level accuracy without heavy overhead. Why…
Google’s search algorithms have become significantly more sophisticated. What passed for acceptable SEO a decade ago—keyword stuffing, aggressive link manipulation, deceptive tactics—now triggers manual penalties or algorithmic demotions. If you’re managing websites, understanding these mistakes can prevent serious ranking damage. Misusing nofollow Tags Many site owners incorrectly use rel=”nofollow” to hide pages from search results…
SEO is not quick. This is the reality that catches most people off guard. The internet has conditioned us to expect instant results — viral content, overnight success, algorithmic magic that transforms a website in weeks. None of that applies to SEO. Be direct about expectations: a newly published page typically needs 3-6 months to…
The HTML5 <canvas> element lets you draw graphics programmatically using JavaScript. Unlike static images or SVG, canvas renders raster (bitmap) graphics directly to a 2D or 3D surface, making it ideal for animations, games, real-time visualizations, and interactive graphics that need frequent updates. This guide covers canvas fundamentals and practical examples for sysadmins and developers…
Xen remains a solid hypervisor choice for specific workloads, though KVM dominates most Linux distributions today. This guide covers installing a paravirtualized DomU on Xen using modern tooling and Rocky Linux 9, which requires specific kernel parameters during installation. Why Paravirtualization Matters Paravirtualized guests communicate directly with the hypervisor rather than emulating hardware, resulting in…
USB technology continues evolving with each generation delivering significant speed improvements. Linux provides comprehensive kernel support across all modern standards through dedicated drivers. USB 2.0 Speed: 480 Mbps (theoretical ~60 MB/s) Status: Legacy but still common. Nearly all systems retain USB 2.0 ports for backward compatibility. Linux support: Built-in via the ehci-hcd driver in all…
Data visualization transforms raw metrics into actionable insights. When you’re managing infrastructure metrics, application logs, business KPIs, or system performance data, visualization is how you extract signal from noise. The human brain processes visual information faster and more reliably than log files or spreadsheet rows—which is why dashboards have become essential infrastructure in modern operations….
The Linux kernel provides the taskstats API to monitor detailed per-task statistics, including I/O wait time, CPU scheduling delays, and memory reclamation waits. Understanding how these metrics are collected at the kernel level is essential for diagnosing performance issues and understanding process behavior. How the Kernel Records I/O Delays The kernel records I/O wait delays…
Picking your first programming language matters, but it’s not the career-defining decision some make it out to be. What matters more is that you pick something reasonable and start building. That said, some choices will save you months of frustration. Know What You’re Optimizing For Before evaluating languages, answer these questions honestly: What do you…
QEMU/KVM uses global locks to synchronize threads, which is necessary for correctness but causes performance problems at scale. When multiple I/O requests and vCPU threads contend for the same lock, you get lock contention that manifests as scheduling jitter, reduced system scalability, and degraded I/O performance. IOThreads (the modern implementation of dataplane) address this by…
Filtering dependent fields based on parent field values is a common requirement in Dynamics 365 CRM. This guide walks through implementing conditional filtering so the salutation dropdown only shows values relevant to the selected gender. Prerequisites Access to a Dynamics 365 environment (2016 or later) with customization rights Basic understanding of option sets and form…
Filtering a dependent lookup field based on another lookup field’s value is a core requirement in Dynamics 365 and Power Apps. The classic example: a Lead entity with Branch and Sub Branch fields where Sub Branch options should only display records matching the selected Branch. The form editor handles this natively—no plugins or JavaScript required….
CFS (Completely Fair Scheduling) is the default process scheduler in modern Linux kernels. Understanding actual timeslice allocation—how long a process runs before being context-switched out—is essential for performance debugging, verifying fairness assumptions, and identifying scheduling anomalies. The challenge is that /proc interfaces and ps commands show scheduling policy but not the actual on-CPU duration per…
This guide covers building REST endpoints in ASP.NET MVC and consuming them from a frontend application. While this example uses AngularJS (end-of-life 2022), the backend patterns remain relevant for legacy system maintenance. For new projects, migrate to ASP.NET Core with modern frontend frameworks like React, Vue, or Angular. Database Setup Create the parts inventory table:…
In computer systems, resources must be balanced across available hardware to maximize performance. The Linux kernel runs migration threads as per-CPU daemons to handle this work. These threads manage task migration between CPUs, CPU hotplug operations, and stop-machine synchronization. You can observe migration threads on any modern system: $ ps aux | grep migration root…
CPU affinity binds a process or thread to specific CPU cores, reducing cache misses, improving performance isolation, and managing NUMA locality. The sched_setaffinity() system call is the primary mechanism in Linux. Understanding how it works at the kernel level clarifies scheduler internals and helps you use it effectively. System Call Entry Point The sched_setaffinity() syscall…
GNOME Shell’s clean, minimal design works well for many users, but the extension ecosystem lets you adapt it to your actual workflow. Here are extensions worth considering for modern GNOME (45+). AlternateTab Changes Alt-Tab behavior from application-grouped switching to per-window switching — more like traditional window managers. If GNOME’s default grouping feels disruptive, this restores…