NDT-DEV email list created

Status: New
Owner: ----
Labels: Type-Defect Severity-Medium

New issue 50 by sekharnv73: Setup_ethtool script affecting the inbound  
throughput.
http://code.google.com/p/ndt/issues/detail?id=50

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 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 16384 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. Run above steps after executing setup_ethtool script and compare results.

What is the expected output? What do you see instead?
Inbound throughput should be around 1Gbit but throughput reported is around  
700MBit if we run the setup_ethtool script at the NDT server. When this  
script is not executed throughput reported is around 940Mbit.



What version of the product are you using? On what operating system?
NDT server 3.6.3
Client : Linux (Ubuntu 9)



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Attachments:
        setup_tool_inbound.png  180 KB