[Dovecot] log message about client_limit may in fact be due to ulimit

[Timo Sirainen]

On 15.2.2012, at 12.30, Timo Sirainen wrote:

>>> Do you see some error message also about "Too many open files",
>> 
>> Ah, now that I grep for it, I see those messages too :)  During one hour, the messages were logged with the following number of occurrences:
>> 
>> - Twice: dovecot: anvil: Error: net_accept() failed: Too many open files
>> - Twice: config: Error: net_accept() failed: Too many open files
>> - Twice: ipc: Error: net_accept() failed: Too many open files
>> - 43 times: master: Warning: service(ipc): client_limit (100000) reached, client connections are being dropped
>> - 43 times: master: Warning: service(anvil): client_limit (100000) reached, client connections are being dropped
> 
> Oh, right. The error message is wrong. There should be a difference between the client_limit having actually reached, and an error condition (e.g. out of fds) that causes a process to temporarily stop listening for new clients (= setting "available client count" to 0, which makes master think it has used up all of its clients). I'll fix it to v2.1.1.

Actually this solves it nicely: http://hg.dovecot.org/dovecot-2.1/rev/701709f472e9

It simply keeps giving net_accept() failures.