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Dave Ellis contact at madvase.co.ukHi Pau,
Thanks for the help so far. I have tried using the kernel-gtp mode and
only managed to cause crashes in the omso-ggsn program. I have updated to
the latest git repository for the osmo-ggsn.
I followed the instructions here
https://osmocom.org/projects/openggsn/wiki/Kernel_GTP to load the kernel
gtp module and the 'lsmod | grep gtp' shows the same as the results in the
instructions.
After that the instructions mention using openggsn. I'm not sure if there
is further configuration required for the kernel gtp module - do I need to
create a tunnel? Or should this be done by osmo-ggsn as it did for the
gtpu-mode tun setting?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
<0002> ggsn.c:203 APN(S1U): Starting
<0002> ggsn.c:281 APN(S1U): Opening Kernel GTP device gtp0
<0002> gtp-kernel.c:75 Initialized GTP kernel mode (genl ID is 30)
Program received signal SIGSEGV, Segmentation fault.
gtp_kernel_init (gsn=0x0, devname=0x6a6fe0 "gtp0",
prefix=prefix at entry=0x6a76e0, ipup=0x0) at gtp-kernel.c:94
94 if (gtp_dev_create(-1, devname, gsn->fd0, gsn->fd1u) < 0) {
I have tried, without success, to find a sample config file with the
kernel-gtp mode in for osmo-ggsn. Is there a sample config file for
osmo-ggsn with the kernel-gtp mode selected?
This is my current config file - I have gone through various attempts with
different tun_device names.
!
! OpenGGSN (0.94.1-adac) configuration saved from vty
!!
!
! kernel-gtp
log stderr
logging filter all 1
logging color 1
logging print category 0
logging timestamp 0
logging level ip info
logging level tun info
logging level ggsn info
logging level sgsn notice
logging level icmp6 notice
logging level lglobal notice
logging level llapd notice
logging level linp notice
logging level lmux notice
logging level lmi notice
logging level lmib notice
logging level lsms notice
logging level lctrl notice
logging level lgtp info
logging level lstats notice
logging level lgsup notice
logging level loap notice
logging level lss7 notice
logging level lsccp notice
logging level lsua notice
logging level lm3ua notice
logging level lmgcp notice
!
stats interval 5
!
line vty
no login
!
ggsn tun1
gtp state-dir /tmp
gtp bind-ip 172.16.8.1
apn S1U
gtpu-mode kernel-gtp
tun-device gtp0
type-support v4
ip prefix dynamic 10.1.1.0/24
ip dns 0 192.168.100.1
ip dns 1 8.8.8.8
ip ifconfig 10.1.1.2/24
no shutdown
default-apn S1U
no shutdown ggsn
Thanks
Dave
On Thu, Mar 29, 2018 at 3:14 PM, Pau Espin Pedrol <pespin at sysmocom.de>
wrote:
> Hi Dave,
>
> I never personally used it, but as far as I know you should be able to get
> more performance by using "gtpu-mode kernel-gtp" instead of "gtpu-mode tun"
> in your config, to avoid doing all packet processing in userspace. Please
> someone else confirm this. I think you need a capable kernel and libgtpnl
> to be able to use it.
>
> Also, it would be nice if you could provide a linux "perf" output on
> osmo-ggsn while running your test setup so we can spot possible
> optimizations to improve osmo-ggsn performance.
>
> --
> - Pau Espin Pedrol <pespin at sysmocom.de> http://www.sysmocom.de/
> =======================================================================
> * sysmocom - systems for mobile communications GmbH
> * Alt-Moabit 93
> * 10559 Berlin, Germany
> * Sitz / Registered office: Berlin, HRB 134158 B
> * Geschaeftsfuehrer / Managing Director: Harald Welte
>
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