NDT-DEV email list created

Status: Accepted
Owner: sekharnv73
Labels: Type-Defect Priority-High

New issue 5 by sekharnv73: Throughput limit displayed related to the  
receive buffer sizes are not correct.
http://code.google.com/p/ndt/issues/detail?id=5

What steps will reproduce the problem?

1. Connect server and client in a 1GBit Switch
2. Start both servers (fakewww and web100)
3. Set the following tcp paramters in both server and client.
        echo 1 > /proc/sys/net/ipv4/tcp_moderate_rcvbuf
        echo 4194304 > /proc/sys/net/core/wmem_max
        echo 4194304 > /proc/sys/net/core/rmem_max
        echo "4096 87380 4194304" > /proc/sys/net/ipv4/tcp_rmem
        echo "4096 16384 4194304" > /proc/sys/net/ipv4/tcp_wmem
        echo "1" > /proc/sys/net/ipv4/tcp_timestamps
        echo "1" > /proc/sys/net/ipv4/tcp_window_scaling
        echo "1" > /proc/sys/net/ipv4/tcp_sack
        echo "0" > /proc/sys/net/ipv4/tcp_ecn

4. Click the start button to start the test and wait till client complete
the test.
5. In the more details window server and client sizes are displayed 1283K
and 1852K. But the throughput limit is displayed as 3801Mbps with server
and 2742Mbs with client.

What is the expected output? What do you see instead?
Since it is showing client is having more buffer client throughput limit
should be more that that server throughput limit displaced.

What version of the product are you using? On what operating system?
NDT server 3.6.0
Client : Linux (Ubuntu 9)

Please provide any additional information below.

Attachments:
        Through calculation problem.png  215 KB

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