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@joemiller
joemiller / 71.patch
Created October 20, 2022 18:55
openbsd 7.1 kernel patch to stop a GFE L6F ACPI interrupt storm
--- /usr/src/sys/dev/acpi/acpi.c.orig Mon Oct 3 16:26:55 2022
+++ /usr/src/sys/dev/acpi/acpi.c Mon Oct 3 16:30:29 2022
@@ -2269,6 +2269,18 @@
{
struct aml_node *node = arg;
uint8_t mask, en;
+
+ /* bad bios. mask/ignore the GPE _L6F (0x6f) interrupt */
+ if (gpe == 0x6f && (sc->gpe_table[gpe].flags & GPE_LEVEL)) {
+ static unsigned short i;
@Juul
Juul / lte_mbim_from_scratch.md
Last active September 18, 2024 12:32
How to use 4G LTE modems like the MC7455 on both Debian/Ubuntu and OpenWRT using MBIM

The purpose of this document is to get you familiar with the concepts and command line tools involved with connecting to the internet using modern 4G LTE modems on both Debian/Ubuntu and OpenWRT.

This writeup is based on my experiences with the Sierra Wireless AirPrime MC7455 modem and a Calyx (Sprint) SIM card, but it should apply to most modern 4G LTE modems.

High level overview

These are the steps required:

  • Physically connect antennas
@giesse
giesse / profile-gab.red
Last active November 20, 2021 19:13
profile function for Red (two variants)
Red []
e.g.: :comment
; ideally not exported on the global context
delta-time*: function [code count] [
start: now/precise
loop count code
difference now/precise start
]
@mjuric
mjuric / DockerUserNamespacesOnCentOS74.md
Last active September 6, 2023 18:31
Setting up Docker with user namespaces on CentOS 7.4

Setting up Docker with user namespaces on CentOS 7.4

The procedure below has been tested on a Digital Ocean VM with CentOS 7.4

# Install docker from RHEL’s standard repos
yum install -y docker

#
# We’ll activate the ‘user namespaces’ feature that defends against
@greggirwin
greggirwin / profile.red
Last active December 28, 2020 06:17
Basic profiling for Red code comparisons
Red []
e.g.: :comment
delta-time: function [
"Return the time it takes to evaluate a block"
code [block! word! function!] "Code to evaluate"
/count ct "Eval the code this many times, rather than once"
][
ct: any [ct 1]
@SemanticallyNull
SemanticallyNull / SyslogFacilityPriorityMatrix.md
Last active February 5, 2024 00:29
Syslog Facility Priority Matrix

The Priority value is calculated by first multiplying the Facility number by 8 and then adding the numerical value of the Severity. For example, a kernel message (Facility=0) with a Severity of Emergency (Severity=0) would have a Priority value of 0. Also, a "local use 4" message (Facility=20) with a Severity of Notice (Severity=5) would have a Priority value of 165. In the PRI of a syslog message, these values would be placed between the angle brackets as <0> and <165> respectively. The only time a value of "0" follows the "<" is for the Priority value of "0". Otherwise, leading "0"s MUST NOT be used. – RFC 5424, Section 6.2.1

Severity ➡️ 0 1 2 3 4 5 6 7
Facilities ⤵️
kernel (0) 0 1 2 3 4 5 6 7
user (1) 8 9 10 11 12 13 14 15
mail (2) 16 17 18 19 20 21 22 23
system (3) 24 25 26 27 28 29 30
@Hengjie
Hengjie / tutorial.md
Last active November 27, 2024 12:51
How to passthrough SATA drives directly on VMWare ESXI 6.5 as RDMs

How to passthrough SATA drives directly on VMWare EXSI 6.5 as RDMs

There aren't many tutorials about this, the only tutorials I've found were about passing through entire PCIe cards to VMs, or refered to old ESXI versions (below 6.5) that used a more comprehensive desktop client instead of the web app. In v6.5, the web app was introduced and the desktop client was deprecated. You used to be able to setup RDMs in the desktop client, but with the introduction of the web console, this is no longer the case. This tutorial shows you how to pass SATA HDDs to the virtual machine on VMWare ESXI 6.5. This tutorial is partially based on VMWare's own KB and the now deprecated Forza IT blog post.

A word about VMWare ESXI 6.7

There is now an option while editing your VM's settings to add a New raw disk when you click `Add ha

@marcan
marcan / linux.sh
Last active July 21, 2024 14:00
Linux kernel initialization, translated to bash
#!/boot/bzImage
# Linux kernel userspace initialization code, translated to bash
# (Minus floppy disk handling, because seriously, it's 2017.)
# Not 100% accurate, but gives you a good idea of how kernel init works
# GPLv2, Copyright 2017 Hector Martin <[email protected]>
# Based on Linux 4.10-rc2.
# Note: pretend chroot is a builtin and affects the current process
# Note: kernel actually uses major/minor device numbers instead of device name
@dcode
dcode / GitHub Flavored Asciidoc (GFA).adoc
Last active October 12, 2024 11:16
Demo of some useful tips for using Asciidoc on GitHub

GitHub Flavored Asciidoc (GFA)

@fntlnz
fntlnz / self-signed-certificate-with-custom-ca.md
Last active November 23, 2024 09:52
Self Signed Certificate with Custom Root CA

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096