Prev: ksoftirq consumes >80% CPU on embedded platform
Next: send SMS from Java on linux
From: annalissa on 28 Jul 2010 01:08
Hi all,

I measured jitter values for a LAN about 30 computers using iperf as
follows:-


iperf -c 192.168.0.210 -ub 100m
------------------------------------------------------------
Client connecting to 192.168.0.210, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 110 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.17 port 45559 connected with 192.168.0.210 port
5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 109 MBytes 91.3 Mbits/sec
[ 3] Sent 77631 datagrams
[ 3] Server Report:
[ 3] 0.0-10.0 sec 109 MBytes 91.2 Mbits/sec 0.405 ms 0/77630 (0%)
[ 3] 0.0-10.0 sec 1 datagrams received out-of-order



[root(a)backup ~]# iperf -su -i 1
------------------------------------------------------------
Server listening on UDP port 5001
Receiving 1470 byte datagrams
UDP buffer size: 126 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.210 port 5001 connected with 192.168.0.17 port
45559

[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 3] 0.0- 1.0 sec 10.9 MBytes 91.1 Mbits/sec 0.041 ms 0/ 7745 (0%)
[ 3] 1.0- 2.0 sec 10.9 MBytes 91.4 Mbits/sec 0.027 ms 0/ 7768 (0%)
[ 3] 2.0- 3.0 sec 10.8 MBytes 90.8 Mbits/sec 0.059 ms 0/ 7722 (0%)
[ 3] 3.0- 4.0 sec 10.9 MBytes 91.3 Mbits/sec 0.175 ms 0/ 7761 (0%)
[ 3] 4.0- 5.0 sec 10.9 MBytes 91.3 Mbits/sec 0.031 ms 0/ 7763 (0%)
[ 3] 5.0- 6.0 sec 10.9 MBytes 91.3 Mbits/sec 0.026 ms 0/ 7762 (0%)
[ 3] 6.0- 7.0 sec 10.9 MBytes 91.3 Mbits/sec 0.161 ms 0/ 7762 (0%)
[ 3] 7.0- 8.0 sec 10.9 MBytes 91.3 Mbits/sec 0.034 ms 0/ 7760 (0%)
[ 3] 8.0- 9.0 sec 10.9 MBytes 91.3 Mbits/sec 0.039 ms 0/ 7763 (0%)
[ 3] 9.0-10.0 sec 10.9 MBytes 91.2 Mbits/sec 0.027 ms 0/ 7759 (0%)
[ 3] 0.0-10.0 sec 109 MBytes 91.2 Mbits/sec 0.405 ms 0/77630 (0%)
[ 3] 0.0-10.0 sec 1 datagrams received out-of-order


Now what I want to know is what are the acceptable values/limits/
ranges for Jitter ?

what is the unit for measuring jitter or what is meant by this ms is
it metre per second ?
From: Arimus on 28 Jul 2010 04:14
On Jul 28, 6:08 am, annalissa <aark...(a)gmail.com> wrote:
> Hi all,
>
> I measured jitter values for a LAN about 30 computers using iperf as
> follows:-
>
> iperf -c 192.168.0.210 -ub 100m
> ------------------------------------------------------------
> Client connecting to 192.168.0.210, UDP port 5001
> Sending 1470 byte datagrams
> UDP buffer size: 110 KByte (default)
> ------------------------------------------------------------
> [ 3] local 192.168.0.17 port 45559 connected with 192.168.0.210 port
> 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 109 MBytes 91.3 Mbits/sec
> [ 3] Sent 77631 datagrams
> [ 3] Server Report:
> [ 3] 0.0-10.0 sec 109 MBytes 91.2 Mbits/sec 0.405 ms 0/77630 (0%)
> [ 3] 0.0-10.0 sec 1 datagrams received out-of-order
>
> [root(a)backup ~]# iperf -su -i 1
> ------------------------------------------------------------
> Server listening on UDP port 5001
> Receiving 1470 byte datagrams
> UDP buffer size: 126 KByte (default)
> ------------------------------------------------------------
> [ 3] local 192.168.0.210 port 5001 connected with 192.168.0.17 port
> 45559
>
> [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
> [ 3] 0.0- 1.0 sec 10.9 MBytes 91.1 Mbits/sec 0.041 ms 0/ 7745 (0%)
> [ 3] 1.0- 2.0 sec 10.9 MBytes 91.4 Mbits/sec 0.027 ms 0/ 7768 (0%)
> [ 3] 2.0- 3.0 sec 10.8 MBytes 90.8 Mbits/sec 0.059 ms 0/ 7722 (0%)
> [ 3] 3.0- 4.0 sec 10.9 MBytes 91.3 Mbits/sec 0.175 ms 0/ 7761 (0%)
> [ 3] 4.0- 5.0 sec 10.9 MBytes 91.3 Mbits/sec 0.031 ms 0/ 7763 (0%)
> [ 3] 5.0- 6.0 sec 10.9 MBytes 91.3 Mbits/sec 0.026 ms 0/ 7762 (0%)
> [ 3] 6.0- 7.0 sec 10.9 MBytes 91.3 Mbits/sec 0.161 ms 0/ 7762 (0%)
> [ 3] 7.0- 8.0 sec 10.9 MBytes 91.3 Mbits/sec 0.034 ms 0/ 7760 (0%)
> [ 3] 8.0- 9.0 sec 10.9 MBytes 91.3 Mbits/sec 0.039 ms 0/ 7763 (0%)
> [ 3] 9.0-10.0 sec 10.9 MBytes 91.2 Mbits/sec 0.027 ms 0/ 7759 (0%)
> [ 3] 0.0-10.0 sec 109 MBytes 91.2 Mbits/sec 0.405 ms 0/77630 (0%)
> [ 3] 0.0-10.0 sec 1 datagrams received out-of-order
>
> Now what I want to know is what are the acceptable values/limits/
> ranges for Jitter ?
>
> what is the unit for measuring jitter or what is meant by this ms is
> it metre per second ?

ms = miliseconds.

Acceptable value for jitter? Depends... email doesn't really care,
ditto file transfer, web browsing etc. For voice over ip/video
conferencing and some streaming protocols jitter impacts on the buffer
sizes required and packetisation applied to the data - but 10's of
miliseconds isn't unheard of so your figures look fine -- as they
should on your LAN.


On your LAN you are below 1ms so that's more than acceptable.

/Ari.
From: david on 28 Jul 2010 20:21
On Tue, 27 Jul 2010 22:08:22 -0700, annalissa rearranged some electrons to
say:


> what is the unit for measuring jitter or what is meant by this ms is it
> metre per second ?

Clearly, you don't understand what you're doing.
 | 
Pages: 1
Prev: ksoftirq consumes >80% CPU on embedded platform
Next: send SMS from Java on linux