[YBA] TCP connection rate

[Gilad Ben-Yossef]

Jonathan Ben Avraham wrote:

> Dear list members,
> What limits the rate that the Linux kernel TCP stack can accept new 
> connections? How is that rate related to the rate that the application 
> listening on a port can handle the connections? That is, if I try to 
> connect and get ECONNREFUSED is there a way for me to know if I got it 
> because the kernel could not handle the connection rate or if I got it 
> because I had more connection attempts than the backlog parameter of 
> my listen() call? In other words, do I need to tune the kernel or the 
> application (MySQL) for the desired high connection rate and how would 
> I know?

Just check what the value of the backlog parameter is and then use 
netstat to watch the application connections when you get ECONNREFUSED 
error. If the number of connections in netstat is equal (or at least 
very close to) the backlog parameter then it's the backlog parameter, 
otherwise it's something else.

Gilad

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