Issue 51 - Setting TCP Module Parameters

PRANAV VIGNESHWAR KUMAR.

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Oct 25, 2021, 12:50:42 AM10/25/21

to NeST users

Hi,

Our team includes the following people

Arnav - arnav.1...@nitk.edu.in

Dhanwin - dhanwinra...@nitk.edu.in

Pranav - pranavnkp...@nitk.edu.in

We will be working on issue 51 which is Setting TCP Module Parameters. Looking forward to get started.

Thanks

Pranav Vigneshwar Kumar

Shanthanu Rai

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Oct 25, 2021, 12:52:42 AM10/25/21

to PRANAV VIGNESHWAR KUMAR., NeST users

Hey Pranav, thanks for letting us know! You can use this mail thread to ask any doubts related to this issue.

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Regards,

Shanthanu S Rai

PRANAV VIGNESHWAR KUMAR.

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Oct 26, 2021, 9:33:47 PM10/26/21

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Hi,

I had a doubt regarding what would happen if we use a congestion control algorithm whose module has not been loaded in Linux yet. Does NeST load in that particular module or does it just throw an error?

Regards

Pranav

Shanthanu Rai

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Oct 27, 2021, 5:29:24 AM10/27/21

to PRANAV VIGNESHWAR KUMAR., NeST users

Hey Pranav, I haven't tested this before, so I am unsure what will happen. My guess would be that NeST would not throw an error and (silently) use the default cubic algorithm. Could you please modify an example (say examples/prp.py) and run it, and let me know what happens?

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PRANAV VIGNESHWAR KUMAR.

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Oct 27, 2021, 9:32:57 PM10/27/21

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So I tried running prp.py with different TCP algorithms and from what I found, it looks like the modules are actually loaded in automatically if it is not present already. I went through the NeST code but could not find anything which explicitly loaded in the modules. My guess would be that netperf loads it in before it obtains the metrics.

Shanthanu Rai

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Oct 27, 2021, 11:38:52 PM10/27/21

to PRANAV VIGNESHWAR KUMAR., NeST users

Oh right, I remember seeing similar behaviour before. Yes you are right, netperf does automatically load the relevant tcp module. This is possible because NeST is running as a privileged process.

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