tcp roundtrip time performance

[Andrey]

Hi everyone,

I'm trying to benchmark network protocol client, and profiler tells me that client spend most of the time inside uv write request. Simple ping-pong test[1] shows 15k roundtrips/sec limit (MacBookAir5,1/OSX). CPU load is reasonably low ( less than 50% on client and server, 4 cores ). Can anyone explain what is the limit here - libuv, TCP stack, v8, ping script, CPU or something else?

[1] https://gist.github.com/sidorares/5573057

Cheers,

Andrey.

[Jorge]

Sounds like if you were running out of ephemeral ports...
--
( Jorge )();

[Andrey]

no, it's just one connection during whole benchmark

[Sri Vidhya]

HI am sending the header information (like below)to node.js on the server side, but it is not working.
How to pass the header information to server from client. and how to get on the server side .
Pls if anyone knows... let me know
 
this is the ajax request call fron client html page:

client.html:
 
          $.ajax({
                    //  url:'http://10.163.14.52:8888/all',
                    url:'http://IPaddress:port/getTaluk/',
                    type:'POST',
                    datatype:'json',
                    data:inputVal,
                    headers : {
                                'emp_value':s,
                                'signature':hash,
                                'timestamp':t
                                },
                    complete:function(){
                        alert(":"+data);
                     
                      
                    }
                 });

on the server side am getting like this using nodejs:

  console.log("emp_value:"+req.headers['emp_value']);
but i can't able to get it.

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--
Thanks,
N. Srividhya.

[Dominic Tarr]

round trips are just slow.

like compare a normal game of ping-pong with a player on each side of the table,

with a game where all players just stood on the same side, and hit balls over the net as fast as they could.

the second one could be way faster, because your not waiting for anyone to return the ball.

extending this metaphore, node is like a great ping pong player,

10x better than the next player.

but not because node can hit the ball 10 times faster,

but rather they because they can play 10 regular games of ping pong at once.