upa

MIT License

Copyright (c) 2021 Ryo Nakamura

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

arr2036

#!/bin/bash
# root qdisc handle
r_handle=1
# netem qdisc handle
n_handle=2 

interface=
delay=
dstip=
qdpresent=

edmonds

21:08:07.858612 CQ 127.0.0.1 UDP 40b "dnstap.info." IN A
21:08:07.858604 RQ 192.5.5.241 UDP 28b "." IN NS
21:08:07.872825 RR 192.5.5.241 UDP 857b "." IN NS
21:08:07.872825 RQ 192.5.5.241 UDP 40b "dnstap.info." IN A
21:08:07.901990 RR 192.5.5.241 UDP 686b "dnstap.info." IN A
21:08:07.901990 RQ 199.254.49.1 UDP 40b "dnstap.info." IN A
21:08:07.964484 RR 199.254.49.1 UDP 596b "dnstap.info." IN A
21:08:07.964484 RQ 192.5.5.241 UDP 48b "ns7.dnsmadeeasy.com." IN AAAA
21:08:07.964484 RQ 192.5.5.241 UDP 48b "ns7.dnsmadeeasy.com." IN A
21:08:07.979984 RR 192.5.5.241 UDP 743b "ns7.dnsmadeeasy.com." IN AAAA

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

antonlindstrom

#!/bin/bash 
#$Id: keepalivepin,v 1.2 2006/02/27 07:30:41 hmy Exp hmy $
#use dig check the powerdns's status.
#in the dns database,have a IN TXT RR keepalivepin.vmmatrix.net,content is "AaBbCcDdEeFf"
# Source: http://puppet-manifest-share.googlecode.com/svn/trunk/vmx-puppet/modules/lvs/files/keepalived.dns-pin
#
RR=keepalivepin.vmmatrix.net
[ $# -le 1 ]&&{ echo "usage: ${0} -h <ip>"; exit 126;}
while getopts "h:" OPT;do
        case $OPT in