This way we avoid triggering timers and doing extra poll loops for each
BTS which is configured but not up. It also has the effect of removing
logging about estimating paging buffers for BTS which are down, which
can be confusing.
Furthermore, since work is delayed until the TRX and cell in general is
configured, the first estimation is properly done now since the correct
configuration is in place at that time.
Related: SYS#5922
Change-Id: I1b5b1a98115b4e9d821eb3330fc5b970a0e78a44
This allows external monitoring to see where the T3113 timer has been
adjusted to, in case it is set dynamically.
Change-Id: I533f2ca3c8e66c143154cbf03b827c9cbbacccdf
Reaching this point will only make system load (CPU, mem) grow, making
it hard for the process to keep up with work to do, with no benefit
since the requests will anyway be scheduled too late.
Related: SYS#5922
Change-Id: I6523c6816a4d16b71084d004e979be40cf0aeeb0
We have seen an increased CPU load in osmo-bsc recently since the paging
improvements where merged, centered round poll() calls.
It is expected most of them will be fixed with previous patch. In any
case, let's avoid unnecessary poll() calls being called for no reason.
Related: OS#5922
Change-Id: Ie767bdc8d4353aafe375a424e02d698ef7fd3dea
We want to recalculate the timer based on last time the work_timer was
triggered (that is, the time when the worker re-armed the pag req to
retransmit). We don't want to recalculate based on the last time the pag
ret tro retransmit was scheduled.
In loaded paging queue, there's lots of retrans (let's say 200) and it
may take more than 500ms to actually retransmit them. That means in most
cases we could end up in a situation where only pag req to retrans where
in the queue, hitting this recalculate path. Since the 500ms were for
sure elapsed, that would most probably schedule the work_timer at {0,0}
for each new paging request that arrived. As a result, the worker would
be scheduled lots of times per second (once for each new req arriving)
and only submitting 1 pag req (the new one) plus potentially 1 or
serveral pag req to retransmit.
In summary, there was not throthling applied in the scenario where only
pag req to retransmit where in the queue and new pag reqs kept arriving.
This incurrs into augmented paging throughput and also augmented
frequency of polls().
Related: OS#5922
Fixes: 4821c9f4df
Change-Id: I7ce6f436286b50dc31331d218ff256cf7be3f619
So far we only calculated the expiration time based on the amount of
requests of the same paging group in the BSC queue.
However, also extra time has to be taken into account regarding requests
of other paging groups. This is important because requests of all paging
groups are mixed in the BSC queue, meaning having a lot of requests from
other groups before a certain req will anyway delay transmit of that
req to some extend.
Related: OS#5537
Change-Id: Ib55f947c5d3490b27e1d08d39392992919512f9a
If the queue is only holding requests in retransmition state, when we
add a new one, we have to re-calculate the work timer to a lower value
instead of letting it wait for the first retransmit to be ready.
Change-Id: Ibd4f8921c92f7481f0b9943041c141640ab812c8
There's no need to keep the timer running, since anyway upon next
trigger it will simply early exit in paging_handle_pending_requests()
becuase there's no more work to do.
Change-Id: I096ab7231f52c741c5fded37acd5b309e1de06e3
Before this patch, on each BTS a 500ms timer was used to schedule some
work, sending up to 20 paging requests verytime.
This means, however, for an initial paging request it may take up to
500ms delay to be scheduled to the BTS, which is huge.
While we still want to maintain this 500ms interval for retransmits, it
doesn't make sense to wait that much for other cases. It's far better
sending less requests (10 instead of 20) every half time (250ms instead
of 500ms), since it will spread the load and paging more over time,
allowing for other work to be done in the middle.
Change-Id: I7a1297452cc4734b6ee8c38fb94cf32f38d57c3d
PAging happens over C0 RSL link, not over OML, so let's actually
validate that the C0 RSL link is up before paging instead of the OML
one.
Change-Id: I11e5bb6f952534763935aa01470e514d4af247ed
Decouple credit_timer from event "available_slots became 0".
Let's actually relate credit_timer to the fact of not receiving CCCH
Load Indication: If no CCCH Load Indication is received (cch_load_ind_period * 2),
then assume we are below CCH Load Indication threshold (10% load) and
start estimating the available_slots in a cch_load_ind_period*2 time
frame.
Moreover, in paging_schedule_if_needed(), there's no use in delaying
start of processing work if the work_timer is not already doing work.
Related: OS#5537
Change-Id: I6a0da03c408270044079e81d431f6641527c00cd
Currently, the Tx paging_req queue at the BSC always has new paging
requests adding at the end (as long as the subscriber is not already in
the queue).
That means, if the queue is full of retransmitions, it will take a long
time until the first paging_req is sent towards that subscriber.
The rationale here is that it makes sense to attempt the first paging
ASAP, and give lower prio to paging_req retransmitions, since it may
well be that those other subsribers are not available/reachable and
won't answer.
Related: SYS#5922
Change-Id: I1ae6d97152c458247bc538233b97c2d245196359
Having one paging request being sent every PAGING_TIMER (500msec) is too
slow in case BSC is serving lots of subscribers on a BTS. Hence, we want
to send many paging requests at once while still trying not to fill the
BTS buffer.
Morever, we don't want to send tons of paging requests at once, hence we
limit the amount of paging requests sent in one timer iteration
(MAX_PAGE_REQ_PER_ITER) in order to avoid the BSC doing lots of work
there at once, keeping it busy from processing other tasks.
Related: SYS#5922
Change-Id: I609fa67834b426456f48f6fb2acb601c5905f178
Similar to paging:attempted, count paging:expired not only per BTS, but
also for the whole BSC. Add active_paging_requests to struct bsc_subscr,
to increase the counter only once if paging expires, and not once per
BTS where paging expired.
Related: SYS#4878
Change-Id: I9c118e7e3d61ed8c9f1951111255b196905eba4d
Instead of having static const structs in header files (which end up
duplicated in each and every compile unit!), have one .c file with the
rate_ctr and stat_item descriptions.
Related: SYS#5542
Change-Id: I8fd6380b5ae8ed2d3347e7cfbf674c30b6841ed9
During LCS development, I'm getting use count bugs and would like to see use
token strings to figure it out.
Change-Id: I29bf60059d4cf7bb99a00753e6cdc149baf95f94
To distinguish between the CN requiring a Complete Layer 3 response, or just
the BSC requiring a TA, allow recording a separate for-LCS paging reason.
Change-Id: Ib28d1599ae4e483727398859d07de4490fbc31f0
For LCS, I would like to add an enum indicating the paging reason. Instead of
modifying extremely many function signatures to pass the reason across all
levels of paging, introduce a struct combining these.
Change-Id: I27ca78fc6ff8ef1101554c0a8429e34945ca6f3c
Instead of iterating the llist of gsm_paging_requests first to find an MSC, and
then again right away to mark the paging as served, do both in the same step.
Change-Id: I447e61afc9934f3a5a82f6076e41c155d3328041
I beleive MSC split is finished a long time ago and everything is
already re-wired for the A-interface.
Change-Id: If2a0b15e360c44abc92fdeb9004be7ccc0537cdd
Place all code related to the object into the related file.
Having all the data model in one file made sense in early stage of
development to make progress quickly, but nowadays it hurts more than
helps, due to constantly growing size and more and more bits being
added to the model, gaining in complexity.
Currently, having lots of different objects mixed up in gsm_data.h is a hole
of despair, where nobody can make any sense were to properly put new stuff
in, ending up with functions related to same object in different files
or with wrong prefixes, declarations of non-existing functions, etc.
because people cannot make up their mind on strict relation to objects
in the data model.
Splitting them in files really helps finding code operating on a
specific object and helping with logically splitting in the future.
Change-Id: I00c15f5285b5c1a0109279b7ab192d5467a04ece
It's quite ugly to have manual "bts=%d" printf-statements all over
the BSC code. Let's change this to use shared logging helper functions
all over the place, whenever we need to log something related to one
BTS or one TRX.
This can also help us as the first step to later add alternative logging
of BTS identities, e.g. by printing the Cell Global Identifier or
LAC+CI, or even a human-readable/vty-defined 'name' of the BTS, rather
than its numeric bts number. With this change in place, we can
introduce such changes at a single location in the code.
Change-Id: I4a7814d164384eecfb6913c31802cf2faead6e6c
Move the T_defs API to libosmocore as osmo_tdefs: remove the local T_defs API
and use libosmocore's osmo_tdef* API instead.
The root reason is moving the mgw_endpoint_fsm to libosmo-mgcp-client to be
able to use it in osmo-msc for inter-MSC handover.
When adding osmo_tdef, the new concept of timer groups was added to the API. It
would make sense to apply group names here as well, but do not modify the VTY
configuration for timers. The future might bring separate groups (or not).
Depends: Ibd6b1ed7f1bd6e1f2e0fde53352055a4468f23e5 (libosmocore)
Change-Id: I66674a5d8403d820038762888c846bae10ceac58
In theroy the function T_def_get_entry() may return a nullpointer. In
this case we would run straight into a nullpointer dereference problem.
However, the requested timer is statically defined and should always be
there. However Coverity still reports this as a problem. Lets put an
OSMO_ASSERT to make clear that there is no problem here.
Fixes: CID#190403
Change-Id: If5238132d9d5a1507b9955a0b2dc4b1bced220e8
The idea is to have a base static value which is set like before "timer
t3113 [seconds]", but now have a part of this timeout calculated
dynamically based on BTS channel configuration and channel load.
This patch only implements initial support to calculate based on channel
configuration, but doesn't include code to calculate based on channel
load. To implement the later part, we probably need to keep track of BTS
paging queues per paging group, which we don't do nowadays.
Dynamic calculation is enabled by default, and default static base value
is decreased accordingly. This way, in a typical setup were the default
10 seconds were used, now the calculated final value is 11 seconds.
That's intended because it was observed experimentally in osmo-gsm-tester with
a similar channel setup that sometimes paging response can arrive slightly
later than 10 seconds.
Related: OS#3680
Change-Id: I4fb2969b690151415038631fb6ad059aa6835c7f
gsm0808_page() is just a thin wrapper for rsl_paging_cmd(), the only caller is
page_ms() from paging.c. Directly call rsl_paging_cmd() instead.
Move gsm0808_cipher_mode() to the only caller in osmo_bsc_bssap.c, make static.
Change-Id: Ib7ce026b52d4ba3e53a8b2824e74ea92432c48c5
Pau Espin
Harald Welte
Oliver Smith
Neels Hofmeyr
Neels Hofmeyr
Martin Hauke
Philipp Maier