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how to reach 1M concurrent TCP connections?

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I am trying to setup a environment with multiple nodes (1 receiver + 16 senders) to establish 1,000,000 (1M) concurrent TCP connections.

Using this tool: https://github.com/Microsoft/ntttcp-for-linux

Using Ubuntu 1804 with latest kernel

Currently, I am easily reached 262,156 concurrent TCP connections with 3+ senders. but after this, seems that the receiver is not able to accept any new TCP connections.

Is there any configuration on Linux I can tune to make 1M TCP connections?

What I have done:

• Receiver side:

ulimit -n 1024000

./ntttcp -P 64 -M -e    ### '-e' to use epoll()

I run this command on receiver side to monitor the number of TCP connections:

ss -ta | grep ESTA | wc -l

• Sender sides

ulimit -n 1024000

echo 1024 65535 > /proc/sys/net/ipv4/ip_local_port_range

./ntttcp -s10.0.0.4 -P 64 -n 10 -l 100    ### 64,000 concurrent TCP connections from one sender

linux networking tcp performance-tuning

share

asked 3 mins ago

Howard ShaneHoward Shane

1061

add a comment | 

0

I am trying to setup a environment with multiple nodes (1 receiver + 16 senders) to establish 1,000,000 (1M) concurrent TCP connections.

Using this tool: https://github.com/Microsoft/ntttcp-for-linux

Using Ubuntu 1804 with latest kernel

Currently, I am easily reached 262,156 concurrent TCP connections with 3+ senders. but after this, seems that the receiver is not able to accept any new TCP connections.

Is there any configuration on Linux I can tune to make 1M TCP connections?

What I have done:

• Receiver side:

ulimit -n 1024000

./ntttcp -P 64 -M -e    ### '-e' to use epoll()

I run this command on receiver side to monitor the number of TCP connections:

ss -ta | grep ESTA | wc -l

• Sender sides

ulimit -n 1024000

echo 1024 65535 > /proc/sys/net/ipv4/ip_local_port_range

./ntttcp -s10.0.0.4 -P 64 -n 10 -l 100    ### 64,000 concurrent TCP connections from one sender

linux networking tcp performance-tuning

share

asked 3 mins ago

Howard ShaneHoward Shane

1061

add a comment | 

I am trying to setup a environment with multiple nodes (1 receiver + 16 senders) to establish 1,000,000 (1M) concurrent TCP connections.

Using this tool: https://github.com/Microsoft/ntttcp-for-linux

Using Ubuntu 1804 with latest kernel

Currently, I am easily reached 262,156 concurrent TCP connections with 3+ senders. but after this, seems that the receiver is not able to accept any new TCP connections.

Is there any configuration on Linux I can tune to make 1M TCP connections?

What I have done:

• Receiver side:

ulimit -n 1024000

./ntttcp -P 64 -M -e    ### '-e' to use epoll()

I run this command on receiver side to monitor the number of TCP connections:

ss -ta | grep ESTA | wc -l

• Sender sides

ulimit -n 1024000

echo 1024 65535 > /proc/sys/net/ipv4/ip_local_port_range

./ntttcp -s10.0.0.4 -P 64 -n 10 -l 100    ### 64,000 concurrent TCP connections from one sender

linux networking tcp performance-tuning

share

asked 3 mins ago

Howard ShaneHoward Shane

1061

share

asked 3 mins ago

Howard ShaneHoward Shane

1061

share

asked 3 mins ago

Howard ShaneHoward Shane

1061

asked 3 mins ago

Howard ShaneHoward Shane

1061

asked 3 mins ago

Howard ShaneHoward Shane

1061