qlyoung

• Snaps don't work if your homedir isn't /home/foo
• Snaps don't work if your homedir is /home/foo but it's nfs
• microk8s straight up doesn't work on zfs (canonical/microk8s#401)

what is software testing

qlyoung

Challenges with running CPU pinned processes within Docker

Programs that want to bind themselves to free cores present some challenges
when run within Docker.

CPU pinning allows a program to request it be assigned exclusively to a core or set of cores This improves cache locality and other factors that become relevant for extremely CPU bound processes, especially in combination with other configurations that prevent the scheduler from assigning other processes

qlyoung

#!/bin/bash

# ----------------------------------------------------------------------------------
# Script for checking the temperature reported by the ambient temperature sensor,
# and if deemed too high send the raw IPMI command to enable dynamic fan control.
#
# Requires:
# ipmitool – apt-get install ipmitool
# slacktee.sh – https://github.com/course-hero/slacktee
# ----------------------------------------------------------------------------------

qlyoung

- hello
+ world

qlyoung

ovrResult mygis(ovrSession session, ovrControllerType controllerType, ovrInputState* inputState)
{
	ovrResult r = gis(session, controllerType, inputState);

	ovrVector2f lh = inputState->Thumbstick[0];
	ovrVector2f rh = inputState->Thumbstick[1];

	if (controllerType == ovrControllerType_Touch) {
		int resx = 500;
		int resy = 500;

qlyoung

• Wherever possible, disable loading the CLI tree for massive performance gains (> 3x)
• If running in parallel, disable pidfile checks
• Skip option parsing
• Disable checksums where applicable

qlyoung

A list of some interesting edge cases in YANG and the FRR Northbound API.

leafrefs as list keys

A leafref is a reference to a leaf in another part of the data tree. Being leaves themselves, they can be used as the key for a list:

list mylist {

qlyoung

• consolidate sockopts into setsockopt.c
• add support for ipv[4|6] pseudoheader checksum to checksum.c

qlyoung

• Linux will send IPv4 (and probably IPv6) datagrams with no payload - just a header.
• It is possible to bind() a socket to an address X on interface A, set the outgoing multicast interface to interface B with IP[V6]_MULTICAST_IF and then send datagrams IP sourced from X but transmitted on B (i.e. using B's MAC address).
• The above does not work when the source address is an IPv6 link local.

qlyoung

#!/usr/bin/python
# Retrieved from: https://gcc.gnu.org/ml/gcc-patches/2015-11/msg01095.html
# Authored by someone at AdaCore
# Copied by Quentin Young with no modifications
# -*- coding: utf-8 -*-

"""Splits an existing .texinfo file into components suitable for
   makeinfo.py
   If "-node <name>" is specified, only that node and its children are
   kept