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remove gnome apps

sudo dnf remove gnome-tour gnome-abrt gnome-calculator gnome-calendar gnome-maps gnome-weather \
    rhythmbox gnome-contacts totem gnome-logs gnome-photos gnome-clocks gedit gnome-system-moniter \
    gnome-user-docs gnome-screenshot gnome-remote-desktop

remove fedora chromium policies

sudo dnf remove fedora-chromium-config

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Install

Run a nix container with podman, with the container destination mounted as /mnt:

DEST=~/containers/nixos
mkdir -p $DEST/{dev,proc,etc/nixos}

podman run -v $DEST:/mnt -it --rm --cap-add SYS_ADMIN docker.io/nixos/nix:latest

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Using VAAPI's hardware accelerated video encoding on Linux with Intel's hardware on FFmpeg and libav

Hello, brethren :-)

As it turns out, the current version of FFmpeg (version 3.1 released earlier today) and libav (master branch) supports full H.264 and HEVC encode in VAAPI on supported hardware that works reliably well to be termed "production-ready".

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-- Thank @sbengo to figure out foreign_keys constraints is defaults to false in sqlite
-- Enable to delete logs by cascading delete
PRAGMA foreign_keys = ON;

WITH n_build_ids_per_repo as (
  SELECT build_id
  FROM (
    SELECT
      build_id,
      build_repo_id,

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/*
 * ctx_time Copyright (C) 2018 Matteo Croce <mcroce@redhat.com>
 * a tool measure the context switch time in clock cycles
 */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>

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#!/usr/bin/env bash
# vi: set ft=sh ts=4 sw=0 sts=-1 sr noet nosi tw=0 fdm=manual:

set -o errexit

declare -A version

version[musl]=1.2.4
version[libevent]=2.1.12
version[ncurses]=6.4

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Wireguard + XVLAN demo

Scripts to confgire a group of hosts on a LAN to use VXLAN over Wireguard.

Wireguard routing

• Making your own private Internet
• VXLAN & Linux
• Bridge vs Macvlan
• iproute2 bridging

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#!/bin/bash

# Bash script to calculate throughput and packets/sec
# Based on code from https://discuss.aerospike.com/t/benchmarking-throughput-and-packet-count-with-iperf3/2791

if [ -z "$1" ]; then
        echo
        echo usage: $0 [network-interface]
        echo
        echo defaulting to eth0

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#include "txq.h"

kprobe:ena_com_prepare_tx
{
  // grab/cast the transmit queue param
  $io_sq = (struct ena_com_io_sq *) arg0;

  // logic copied from from ena_com_free_q_entries
  $queuelen = (uint16) $io_sq->tail - (uint16) $io_sq->next_to_comp;

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AWSTemplateFormatVersion: '2010-09-09'

Description: Extreme Performance Tuning Benchmark Environment


Parameters:
  AmiId:
    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
    Default: '/aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2'