Max telnet sessions Redhat AS2.1

[Geoff Dunk_1]

I am having trouble with telent sessions failing at about 120 when connecting to our RH AS2.1. We are performance testing our machines and I am getting the error:
xinetd[1037]: telnet: fork failed: Cannot allocate memory (errno = 12)
I need to connect to the machine with around 2000 sessions. Can anyone out there help please?

[Geoff Dunk_1]

I have tried the CONFIG_UNIX98_PTY_COUNT option, but this is an invalid parameter under AS2.1.

[Ivajlo Yanakiev]

Offhand what are the limits for the system? (ulimit -Ha and ulimit -Sa)

/proc/sys/fs/file-nr and inode-nr values What is swap usage ?
#free

It can be lack of indos for FD
or low memory

[Ivajlo Yanakiev]

Also you cant install glance to see waht kernel parm is 100 % used.

[Geoff Dunk_1]

I have these values on my system, and at the time of error, there was no swapping going on.

inode-nr
132772 132303

file-nr
374 32 262144

core file size (blocks) 0
data seg size (kbytes) unlimited
file size (blocks) unlimited
max locked memory (kbytes) unlimited
max memory size (kbytes) unlimited
open files 1024
pipe size (512 bytes) 8
stack size (kbytes) 8192
cpu time (seconds) unlimited
max user processes 14335
virtual memory (kbytes) unlimited

Any good ideas?

[Ivajlo Yanakiev]

what kind of kernel you use ?
#uname -a

[Steven E. Protter]

It may be other problems. You may not have the ability to create more processes or inadequate swap memory.

The fact it happens at 120 users does point to a limit in the kernel. The error message itself brings up the possibility of other issues.

SEP

[Geoff Dunk_1]

Steven
Any pointers the direction or area I need to look?

[Ivajlo Yanakiev]

I have some idea.
do not use xinetd for fork telnet
start telnetd daemon and test again.

Pls give me your kernel version
#uname -a

[Geoff Dunk_1]

kernel version is:
2.4.9-e.12smp