Hi Pau and Harald,
> So sgsnemu is passing use_kernel=false, which makes the lib skip gtp-kernel
> functions
That is nice, I can play with that part quite nicely and take a look
how the GGSN handles the switch between kernel and non-kernel GTP.
Thanks for that!
@Harald:
In gtpnl.h there is
int gtp_dev_create()
and
int gtp_dev_create_sgsn()
So it seems there is a different dev create for the SGSN mode. And in
the later one the role is set to "GTP_ROLE_SGSN"
int gtp_dev_create(int dest_ns, const char *gtp_ifname, int fd0, int fd1)
{
return _gtp_dev_create(dest_ns, gtp_ifname, fd0, fd1, GTP_ROLE_GGSN);
}
EXPORT_SYMBOL(gtp_dev_create);
int gtp_dev_create_sgsn(int dest_ns, const char *gtp_ifname, int fd0, int fd1)
{
return _gtp_dev_create(dest_ns, gtp_ifname, fd0, fd1, GTP_ROLE_SGSN);
}
EXPORT_SYMBOL(gtp_dev_create_sgsn);
I just need to find the relevant part is sgsn-emu to see where these
parts are invoked so I can make the modifications.
Regards,
Csaba
<[email protected]> ezt írta (időpont: 2022. dec. 24.,
Szo, 13:00):
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> Today's Topics:
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> 1. Re: SGSNemu performance (Pau Espin Pedrol)
> 2. Re: SGSNemu performance (Harald Welte)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 23 Dec 2022 18:38:55 +0100
> From: Pau Espin Pedrol <[email protected]>
> Subject: Re: SGSNemu performance
> To: Sipos Csaba <[email protected]>,
> "[email protected]" <[email protected]>,
> [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> 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/
> =======================================================================
> * sysmocom - systems for mobile communications GmbH
> * Alt-Moabit 93
> * 10559 Berlin, Germany
> * Sitz / Registered office: Berlin, HRB 134158 B
> * Geschaeftsfuehrer / Managing Director: Harald Welte
>
> ------------------------------
>
> Message: 2
> Date: Fri, 23 Dec 2022 18:47:57 +0100
> From: Harald Welte <[email protected]>
> Subject: Re: SGSNemu performance
> To: Pau Espin Pedrol <[email protected]>
> Cc: Sipos Csaba <[email protected]>,
> "[email protected]" <[email protected]>
> Message-ID: <Y6XpzZoYYdVxYKdb@nataraja>
> Content-Type: text/plain; charset=us-ascii
>
> Hi Csaba and Pau,
>
> On Fri, Dec 23, 2022 at 06:38:55PM +0100, Pau Espin Pedrol wrote:
> > You could try passing use_kernel=true to tun_new(), and see how far you can
> > get. Patches welcome.
>
> The GTP kernel module needs to be told if it operates in SGSN or GGSN mode.
>
> grep for GTP_ROLE_SGSN in libgtpnl. I don't know all of the related functions
> off my head, but on the SGSN side you need to make sure to initialize the
> kernel
> GTP with GTP_ROLE_SGSN instead of GTP_ROLE_GGSN.
>
> --
> - Harald Welte <[email protected]> https://laforge.gnumonks.org/
> ============================================================================
> "Privacy in residential applications is a desirable marketing option."
> (ETSI EN 300 175-7 Ch. A6)
>
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> End of OpenBSC Digest, Vol 98, Issue 9
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