value for the linux firebird user
su - firebird
ulimit -Ha
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
scheduling priority (-e) unlimited
file size (blocks, -f) unlimited
pending signals (-i) unlimited
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 999999
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) unlimited
real-time priority (-r) 0
stack size (kbytes, -s) unlimited
cpu time (seconds, -t) unlimited
max user processes (-u) unlimited
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

I have the linux debian 64 bits.

--- In firebird-support@yahoogroups.com, Philippe Makowski <makowski@...> wrote:
>
> 2010/10/19 mick_dang <mickael.danguelle@...>
>
> > mode classsic process server, I have a number of connections élévés.mais, my server starts up in RAM and has completed the swap.
> add more ram
> and be sure using a x86_64 kernel and Firebird
>
> > mode thread, I have 510 connections on the database employee.fdb and I end up with an error message connection refused
> > My ulimit-Ha
> your's ?
> or the values for the linux firebird user ?
>
> and again, check your tcp stack, look for SOMAXCONN (google can help)
> for example : http://www.sysarchitects.com/files/VanDyk_Des_Moines_Web_Geeks_09.pdf
>
> netdev_max_backlog: http://www.google.com/linux?&q=netdev_max_backlog
> somaxconn: http://www.google.com/linux?&q=somaxconn
>