In a previous blog post, I evaluated the performance penalty of virtual storage. I compared different host filesystems and different hypervisors (including QEMU). The conclusion was pretty harsh: in all tested configurations, virtual disks are almost 10 times slower than host drives. In this blog post, I will test additional QEMU configuration options, to see if I can get better results...
ReadIn a previous blog post, I showed how to use sysbench to benchmark a Linux system. I ran the tool on various systems I had access to, and I was staggered by the performance penalty of virtual storage: a virtual disk (vdi) is roughly 10 times slower than the actual disk it is reading from or writing to. In this blog post, I want to show the results of some additional tests that, sadly enough, will only confirm this observation...
ReadWhen discussing desktop hypervisors, one usually think to the main commercial players: VMware Workstation, VMware Fusion (for Mac), Hyper-V (built-in Windows) and VirtualBox. Actually, on Linux QEMU/KVM is also a solution thanks to the Virtual Machine Manager.
ReadIn a previous blog post, I have shown how to create a Linux kernel module. This time I will show how the Linux kernel uses a task_struct to manage threads and processes. To illustrate, I will show how a kernel module can access and alter these, and thus also alter the inner working of the Linux kernel.
ReadIn a previous blog post, I presented how to build your own Linux kernel. This time I will show how to create, compile and load a very simple kernel module...
ReadIn this blog post I will show how to configure, compile and install a custom Linux kernel.
ReadRunning an complete Laravel development environment requires multiple services: web server, database server, queue worker etc. Laravel Sail helps you install and use all these using docker containers. Here is how to use it...
ReadSystemd is now the defacto standard init process on Linux systems. It is responsible for starting all required services... In this blog post we will present the basic concepts of systemd : basic usage, units and dependencies.
ReadSetting up a Laravel environment requires to install and configure multiple components: the correct PHP version, of course, but also a database, node server, probably queue worker and scheduler. To get you quickly started, here is how to deploy a dev environment for Laravel with docker compose.
ReadIn a previous blog post, we have built a micro-Linux system relying on initramfs. In this blog post, we will add modules to this minimal system.
ReadIf you use GitLab pipelines to build Docker image, you may encounter the error "cgroups: cgroup mountpoint does not exist: unknown". Here is how to fix...
ReadIn this blog post, I will show how to use sysbench to test the CPU, memory and storage performance of a Linux system. I also had the chance to access some diverse hardware (laptop, desktop, servers). So I'll also give some results for you to compare with.
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