04-09-2009
What do you mean by "dd's own representation of the data"? The command he gave does just one thing: copy 20480*512 bytes (= 10485760 bytes = 10 MB) from /dev/zero (which always returns the \0 byte as fast as the processor can) to a file on the SD card. And AFAIK using dd to measure throughput is quite common, as it doesn't do any other stuff to the data.
It would be interesting what the numbers would be if you'd transfer 100 or 1000/1024 MB a few times.
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LEARN ABOUT DEBIAN
speedometer
speedometer(1) User Commands speedometer(1)
NAME
speedometer - measure and display the rate of data across a network connection
SYNOPSIS
speedometer [options] tap [[-c] tap] ...
DESCRIPTION
Monitor network traffic or speed/progress of a file transfer. At least one tap option (-f, -rx, -tx) must be entered. Option -c starts a
new column, otherwise taps are piled vertically.
Note: before you use the program, satrt generating traffic by transferring files in/out e.g. with scp(1) in the network you're measuring.
OPTIONS
-b Use old blocky display instead of smoothed display even when UTF-8 encoding is detected.
-f filename [size]
Display download speed with progress bar. This option must be used if directly following another file tap without an expected size
specified.
-i interval
Interval in seconds. Examples: 5 or 0.25". Default is 1.
-p Use plain-text display (one tap only).
-rx iface
Display bytes received on network interface.
-tx iface
Display bytes transmitted on network interface.
-z Report zero size on files that don't exist instead of waiting for them to be created
EXAMPLES
How long it will take for my 38MB transfer to finish?
speedometer favorite_episode.rm $(( 38 * 1024 * 1024 ))
How quickly is another transfer going?
speedometer dl/big.avi
How fast is this LAN?
host-a$ cat /dev/zero | nc -l -p 12345
host-b$ nc host-a 12345 > /dev/null
host-b$ speedometer -rx eth0
How fast is the upstream on this ADSL line?
speedometer -tx ppp0
How fast can I write data to my filesystem? (with at least 1GB free)
dd bs=1000000 count=1000 if=/dev/zero of=bigfile &
speedometer bigfile
ENVIRONMENT
None.
FILES
None.
SEE ALSO
htop(1) iotop(1) scp(1) top(1) vmstat(1)
AUTHORS
Program was written by Ian Ward <ian.ward@excess.org>
This manual page was written by Jari Aalto <jari.aalto@cante.net>. Released under license GNU GPL version 2 or (at your option) any later
version. For more information about license, visit <http://www.gnu.org/copyleft/gpl.html>.
speedometer 2011-12-10 speedometer(1)