calculating Bandwidth delay product

Hi,
Please guide me regarding some doubts on calculating the BDP

I am using the following formula,

BDP = bandwidth * RTT
= 100 mbs * 67 ms
= 13107200 byte * .067 sec
= 878182.4 bytes/sec
= 857.6 KBytes
= 860 KBytes approx

Based on that , I have done the following changes.

sysctl -w net.core.ipv4.rmem = 4096 87380 878182
sysctl -w net.core.ipv4.wmem = 4096 87380 878182


sysctl -w net.core.wmem_max = 878182
sysctl -w net.core.rmem_max = 878182

Is the following are corrects. After doing these settings , I am
receiving a transfer rate of 70 mbs using iperf , a TCP and UDP
performance measurement tool. But if i double
the value of BDP i.e if I use 1600 Kbytes of BDP , then I am
reaching the bandwidth
of 97 mbs .
My question is . is it O.K to assign a greater value (as twice
as ) , then the calculated
BDP . Or the RFCs does not allow this.

Also another doubt which bandwidth we should consider.



query.cdac@gmail.com

On Sun, 22 Apr 2007 23:55:54 -0700, query.cdac rearranged some electrons
to form:

> Hi,
> Please guide me regarding some doubts on calculating the BDP
>
> I am using the following formula,
>
> BDP = bandwidth * RTT
> = 100 mbs * 67 ms
> = 13107200 byte * .067 sec
> = 878182.4 bytes/sec
> = 857.6 KBytes
> = 860 KBytes approx

It's not bytes per second, it's bytes * sec.

--
David M (dmacchiarolo)
http://home.triad.rr.com/redsled
T/S 53
sled351 Linux 2.4.18-14 has been up 7 days 11:33

On Sun, 22 Apr 2007 23:55:54 -0700, query.cdac rearranged some electrons
to form:

> Hi,
> Please guide me regarding some doubts on calculating the BDP
>
> I am using the following formula,
>
> BDP = bandwidth * RTT
> = 100 mbs * 67 ms
> = 13107200 byte * .067 sec
> = 878182.4 bytes/sec
> = 857.6 KBytes
> = 860 KBytes approx
>
I meant, "bytes/sec" * sec = "bytes".

--
David M (dmacchiarolo)
http://home.triad.rr.com/redsled
T/S 53
sled351 Linux 2.4.18-14 has been up 7 days 11:37

On Mon, 23 Apr 2007 05:23:33 -0400, David M rearranged some electrons to
form:

> On Sun, 22 Apr 2007 23:55:54 -0700, query.cdac rearranged some electrons
> to form:
>
>> Hi,
>> Please guide me regarding some doubts on calculating the BDP
>>
>> I am using the following formula,
>>
>> BDP = bandwidth * RTT
>> = 100 mbs * 67 ms
>> = 13107200 byte * .067 sec
>> = 878182.4 bytes/sec
>> = 857.6 KBytes
>> = 860 KBytes approx
>
> It's not bytes per second, it's bytes * sec.
Sorry, I meant: bytes per second * sec = bytes.

--
David M (dmacchiarolo)
http://home.triad.rr.com/redsled
T/S 53
sled351 Linux 2.4.18-14 has been up 7 days 11:39