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#!/usr/bin/env bash

set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]

zenofile

security and hardening options for systemd service units

A common and reliable pattern in service unit files is thus:

NoNewPrivileges=yes
PrivateTmp=yes
PrivateDevices=yes
DevicePolicy=closed
ProtectSystem=strict

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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'

zenofile

#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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#!/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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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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#!/usr/bin/env bash

set -o errexit

MUSL_VERSION=1.2.5
LIBEVENT_VERSION=2.1.12
NCURSES_VERSION=6.5
TMUX_VERSION=3.5a

TARGETDIR=$1

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/*
 * ctx_time Copyright (C) 2018 Matteo Croce <[email protected]>
 * 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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-- 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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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".