[LARTC] Problem with bandwidth

[LARTC] Problem with bandwidth

[Tzeh Yeu Leang]

Hi all,

   Here is my setup: Host1 ---> Router ----> Host2

   When i run ttcp -t on Host1 while ttcp -r in Host2, the bandwidth that i 
can get is about 860 Kbytes/s, which is less than 7Mbps. But i am using NIC 
10Mbps for all machines. Why is that so?

   Currently, i am experimenting with the example efcbq. I am using MGEN (a 
UDP traffic generator) to send 2 flows of traffic (EF and BE) from Host1 to 
Host2. I allocate EF 3Mbit and BE 7Mbit in router. But using DREC (a 
receiver that comes with MGEN), i observed the bandwidth obtained by BE and 
EF do not tally with my tc configurations. And the sum of the total 
bandwidth received is about 4-5Mbps. I read somewhere in the mailing list 
that udp will have defragmentation problem. Another reason that i can guess 
is the way the software (MGEN and DREC) measure is not accurate. Any 
suggestions on what software i can use in order to have measurement that 
tally with tc configurations?

   Thanks.


_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.


_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/

[LARTC] Problem with bandwidth

[Tzeh Yeu Leang]

Hi all,

   Here is my setup: Host1 ---> Router ----> Host2

   When i run ttcp -t on Host1 while ttcp -r in Host2, the bandwidth that i 
can get is about 860 Kbytes/s, which is less than 7Mbps. But i am using NIC 
10Mbps for all machines. Why is that so?

   Currently, i am experimenting with the example efcbq. I am using MGEN (a 
UDP traffic generator) to send 2 flows of traffic (EF and BE) from Host1 to 
Host2. I allocate EF 3Mbit and BE 7Mbit in router. But using DREC (a 
receiver that comes with MGEN), i observed the bandwidth obtained by BE and 
EF do not tally with my tc configurations. And the sum of the total 
bandwidth received is about 4-5Mbps. I read somewhere in the mailing list 
that udp will have defragmentation problem. Another reason that i can guess 
is the way the software (MGEN and DREC) measure is not accurate. Any 
suggestions on what software i can use in order to have measurement that 
tally with tc configurations?

   Thanks.


_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.


_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/