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richb-hanover / ndt

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Throughput detected is more than the limit displayed in moredetails window. #29

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
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 client TCP parameters as bellow
    echo 1 > /proc/sys/net/ipv4/tcp_moderate_rcvbuf
    echo 131071 > /proc/sys/net/core/wmem_max
    echo 131071 > /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. Set the server TCP parameters as bellow.
    echo 0 > /proc/sys/net/ipv4/tcp_moderate_rcvbuf
    echo 131071 > /proc/sys/net/core/wmem_max
    echo 131071 > /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

5. Open the browser and open the NDT home page.
6. Start test by clicking Start button and check the results on main window
and in more details window.

What is the expected output? What do you see instead?
Normally the throughput detected should be less than or equal to the
throughput calculated in the more details window.
Server receive buffer limiting the throughput is less where as the outbound
throughput displayed in main window is more.

What version of the product are you using? On what operating system?
NDT server 3.6.1 
Client : Linux (Fedora 8)

Please provide any additional information below.

Original issue reported on code.google.com by sekharn...@gmail.com on 5 Mar 2010 at 6:25

Attachments:

GoogleCodeExporter commented 9 years ago

Original comment by jwzuraw...@gmail.com on 10 Mar 2010 at 9:00