[YBA] TCP connection rate

[Jonathan Ben Avraham]

Hi Gilad,
Thanks. The problem is that the connections are exceedingly short-lived. 
By the time I type in "netstat -na" already 1000 of them have come and 
gone.

  - yba


On Mon, 2 Feb 2009, Gilad Ben-Yossef wrote:

> Date: Mon, 02 Feb 2009 16:29:23 +0200
> From: Gilad Ben-Yossef <gilad at codefidence.com>
> To: Jonathan Ben Avraham <yba at tkos.co.il>
> Cc: ILUG <linux-il at cs.huji.ac.il>
> Subject: Re: [YBA] TCP connection rate
> 
> 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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