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http://cgit.osmocom.org/osmo-pcu/commit/?id=efe62a73953349ba38781af2c264f273b2dde6e6
commit efe62a73953349ba38781af2c264f273b2dde6e6
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Thu Jul 2 15:48:25 2015 +0200
alloc: Use least reserved PDCH for algo A
Currently the slot selection of algorithm A is based on the current
slot usage by active TBF. Especially in the Dl after UL case which
reflects the commen use case "MS initiates TCP connection", the
resulting distribution is not optimal with respect to PDCH usage.
This commit changes the implementation to use the slot reservation
information instead.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=14376a73a5916a3dfa5bb65a2487d364a933e4c8
commit 14376a73a5916a3dfa5bb65a2487d364a933e4c8
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Tue Jul 7 11:31:28 2015 +0200
alloc/test: Delete first TBF after the second is allocated
Currently when using the test modes TEST_MODE_DL_AFTER_UL or
TEST_MODE_UL_AFTER_DL, the first TBF is deleted before the second is
allocated. The far more interesting case were to keep the first TBF a
little bit longer until the second TBF has been created and delete
then. This comes closer the the situation observed with real MS,
where the first TBF takes some time (timeout or waiting for Ack)
before it gets deleted and thus detached from the MS object.
This commit delays the call to tbf_free accordingly.
The effect can be observed in the results of the algo A tests, where
the uniform distribution of the allocated PDCH is lost.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=506f156f7a4aebb52dace00a760f86b2b4f5e19a
commit 506f156f7a4aebb52dace00a760f86b2b4f5e19a
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Thu Jul 2 13:19:49 2015 +0200
sba: Reverse TS search order
Currently the search for an enabled PDCH slot for SBA start with the
first TS. If there are more than 2 PDCH slots enabled, this slot will
conflict with an existing multislot reservation for most multislot
classes. This were less likely if the search were reversed and
started with the last slot due to the 3 slot shift between Tx and Rx.
When multislot allocation is enabled and several MS are connected,
and increased rate of poll timeouts can be observed.
This commit tries to reduce the number of poll timeouts by reverting
the slot search order for SBA allocation.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=1653f837e3be32d94eeaabf29ae89fdf1dc66bac
commit 1653f837e3be32d94eeaabf29ae89fdf1dc66bac
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Tue Jun 30 14:48:13 2015 +0200
alloc: Disable inner loop debugging by default
The current logging statements within the inner loop of
find_multi_slots drain quite a lot of CPU resources even if
LOGL_DEBUG is not enabled. This might cause issues on the target
hardware.
This commit disables these LOGP calls unless the
ENABLE_TS_ALLOC_DEBUG macro has been set explicitly. This results in
a reduction in the CPU usage reported by callgrind for
find_multi_slots from 42% to 25% when executing AllocTest.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=20b7ba75017a590294dcd4e38135293f33f66740
commit 20b7ba75017a590294dcd4e38135293f33f66740
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Tue Jun 30 14:34:24 2015 +0200
alloc: Optimize find_free_usf
According to callgrind, this function consumes 33% CPU when running
the AllocTest program.
This commit uses the assigned_usf() method to get the USFs allocated
by a PDCH instead of traversing the TBFs.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=cc9358f95aca618db451faf53971c45dfe0b505a
commit cc9358f95aca618db451faf53971c45dfe0b505a
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Tue Jun 30 14:10:13 2015 +0200
tbf: Keep a set of used TFI and USF per PDCH
Currently is is rather expensive to get TFI and USF usage per PDCH,
because the TBFs need to be scanned to get that information.
This commit adds corresponding bit sets which get updated by the
attach_tbf/detach_tbf methods of the gprs_rlcmac_pdch class.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=16c6ecc3657f62728845764731c189b3cb8daca2
commit 16c6ecc3657f62728845764731c189b3cb8daca2
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Tue Jun 30 13:40:18 2015 +0200
alloc: Skip common TS without free USF when rating
Currently the search of the "best" slot combination is done
separately from the UL slot selection, which can lead to an
allocation failure due to USF exhaustion even if another combination
had been possible.
This commit reduces the probability for this event by skipping UL
slots without free USF while calculation the capacity.
Note that the implementation is rather inefficient which will be
fixed by the following commits.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=5f494b8415ff4e5c9bf323ea7bc8326ad423c7ae
commit 5f494b8415ff4e5c9bf323ea7bc8326ad423c7ae
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Wed Jul 1 13:10:41 2015 +0200
alloc: Only reserve 1 UL slot with algorithm B
Since currently the algorithm B will only allocate a single UL slot
and will have to stick to it (first common TS), the other possible UL
slots will not be allocated while the reservation is kept.
This commit adds code to update the reserved set of UL slots to only
reserve the single common TS when the UL TBF is allocated.
Interestingly this leads to fewer allocated TBF in some cases due to
USF exhaustion. This will be improved by the following commit "alloc:
Skip common TS without free USF".
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=9ae282372c9b3e10050244b8a1c9179122556175
commit 9ae282372c9b3e10050244b8a1c9179122556175
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Wed Jul 1 12:27:30 2015 +0200
alloc: Set minimum slot capacity to 1
Currently the capacity of a PDCH slot is calculated as 32 - N_reserved
for each direction. This can result in a capacity of 0 and even
negative values.
This commit forces the capacity of an usable slot to be at least zero
under the assumption, that an overly reserved PDCH is still better
than none.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=ed46afda6f647e47702379abacf632e7dcc9ee5b
commit ed46afda6f647e47702379abacf632e7dcc9ee5b
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Wed Jul 1 12:19:40 2015 +0200
alloc: Only use common UL slots when calculating the capacity
Currently al possible UL slots are included in the capacity
calculation which is the base of the slot selection. Nevertheless
UL-only slots will never be used, since only one uplink slot (which
must be a common slot) will be used.
This patch changes the code to only include common slots in the
capacity sum.
Note that this might not be optimal if algorithm B supported
multiple uplink slots.
Sponsored-by: On-Waves ehf
http://cgit.osmocom.org/osmo-pcu/commit/?id=ea65c72d069c279951c022daf337d99e3aaa670a
commit ea65c72d069c279951c022daf337d99e3aaa670a
Author: Jacob Erlbeck <jerlbeck at sysmocom.de>
Date: Mon Jun 22 16:14:23 2015 +0200
alloc: Replace Algorithm B implementation
The current implementation always starts the downlink slot allocation
with the first possible slot, depending on which channels are enabled
and which multislot class is offered by the MS. So in configurations
with many (>4) PDCH, some PDCH are not really used.
The new implementation introduced by this commit differs as follows:
- The reservation mechanism provided by GprsMs is used to avoid
incompatibilities is used in the same way like algo A does. This
basically means, that the allocation is done once when the first
TBF is requested and then used until all TBF have been released.
- All combinations of Rx and Tx slots are checked for compatibility
with the multiscot class. Basically the combination with the most
usable PDCH and the least number of reservations is used.
- Only one UL slots is provided.
- Tta and Tra are checked.
Sponsored-by: On-Waves ehf
-----------------------------------------------------------------------
Summary of changes:
src/bts.cpp | 28 +-
src/bts.h | 15 +
src/gprs_rlcmac_ts_alloc.cpp | 882 ++++++++++++++++++++++---------------------
src/sba.cpp | 4 +-
tests/alloc/AllocTest.cpp | 46 +--
tests/alloc/AllocTest.err | 14 +-
tests/alloc/AllocTest.ok | 470 ++++++++++++++---------
tests/tbf/TbfTest.err | 106 +++---
8 files changed, 878 insertions(+), 687 deletions(-)
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