question: tcp rmem/wmem

[diptanshu singh]

Hi,

First of all, this is great work and i have started using this for various simulations. I have a question:  Assuming reno as congestion avoidance algo with 20ms RTT,  I would need to tweak the net.ipv4.tcp_rmem/tcp_wmem to make sure the snd/rcv buffers are not a bottleneck. In my example, my BDP for a 10G link * 20ms = 25Mbytes.

My question is, how is this being currently handled? Is this something a user needs to set, and if so, how can I do that?

Thanks

Dip 

[Shanthanu Rai]

Hey Diptanshu, thank you for showing your interest in NeST! Please find my reply inline below:

 My question is, how is this being currently handled? Is this something a user needs to set, and if so, how can I do that?

 

There is an API in NeST to configure TCP parameters in node. 

For e.g., if you want to update net.ipv4.tcp_wmem in a `node`, the API is

node = Node("node")

node.configure_tcp_param("wmem", "<value>") # Replace <value> with appropriate value

You can find more information about the API here: https://nest.nitk.ac.in/docs/v0.4.1/api/topology.html#nest.topology.node.Node.configure_tcp_param

Thanks,

Shanthanu

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Regards,

Shanthanu S Rai

[dip]

perfect thanks. I missed that in my search.