Hi Csaba,
On 12/22/22 15:00, Sipos Csaba wrote:
Dear Harald,
Sorry to spam the openbsc list with this, but if you (or someone) can
confirm if the Sgsn-emu part of Osmo-GGSN utilizing the kernel GTP
module or not, that would be lovely.
sgsnemu is not using the kernel module, only osmo-ggsn has support for
it so far.
See osmo-ggsn.git/./sgsnemu/sgsnemu.c line 1905 calling:
"""
if (tun_new((struct tun_t **)&tun, options.tun_dev_name, false, -1, -1))
"""
See tun_new() function used by both osmo-ggsn and sgsnemu:
"""
int tun_new(struct tun_t **tun, const char *dev_name, bool use_kernel,
int fd0, int fd1u) {
"""
So sgsnemu is passing use_kernel=false, which makes the lib skip
gtp-kernel functions like gtp_kernel_create().
FYI, I was not able to pass more than 280Mbit and the sgsn-emu process
was maxing out a single core. Based on this I suspect that it does not
use the kernel GTP module. I have seen some commits that indicates
preparation work for this feature, but it is unclear at least to me,
if this was finished or not. In the Osmo-GGSN.cfg example config I can
see the config option for kernel GTP, but not in the sgsn-emu.cfg
example.
You could try passing use_kernel=true to tun_new(), and see how far you
can get. Patches welcome.
Regards,
Pau
--
- Pau Espin Pedrol <[email protected]> http://www.sysmocom.de/
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