AZLOCO Meeting Date Changes

Effective 17 February, the Ubuntu Arizona Local Community Team (AZLOCO) will only hold on line meetings on the 1st and 3rd Sundays of each month. The time, 9:00-9:30 pm, and of course the IRC channel, #ubuntu-us-az on, will remain the same. This change is the result of several factors, the low attendance at the on line meetings and the apparent repetitive release of information. The meeting notes will continue to be sent to those members who have subscribed to the AZLOCO mailing list.

gigabit switch test

I setup a gigabit switch and wanted to check the transfer rate between 2 linux systems.

1) Using iperf
install iperf on both server and client, sudo apt install iperf

on server: iperf -s
on client: iperf -c server_host
Client connecting to server_host, TCP port 5001
TCP window size: 85.0 KByte (default)
[ 3] local port 36798 connected with port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1.09 GBytes 939 Mbits/sec

2) Using nc
nothing to install, nc is already installed.

on server: nc -vvlnp 12345 >/dev/null
on client: dd if=/dev/zero bs=1M count=1K | nc -vv server_host 12345

Connection to server_host 12345 port [tcp/*] succeeded!
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 9.16265 s, 117 MB/s

iperf reports 939 Mbits/sec, about same as 117 MB/s (divide 939 / 8 bits/byte)