This is a move of the series posted by Emmanuel a few days ago to the
tip of Linus' master. It also applies pretty easily to 3.12.5-rt5
0010: iwlwifi: pcie: stop using _irqsave
* There's no function iwl_trans_pcie_op_mode_leave(), instead
iwl_trans_pcie_stop_hw() was updated
A part from that, the port was relatively straight forward, but someone
should probably have a look to make sure I didn't miss anything
So, some tests on my laptop (Lenovo X220, i5-2520M)
3.12.1-rt4 (which has Sebastians iwlwifi workaround):
cyclictest -p80 -i 1000 -l500000 -a -n -m -t2
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 0.40 2.19 1.69 2/513 4682
T: 0 ( 4118) P:80 I:1000 C: 500000 Min: 2 Act: 12 Avg: 8 Max: 47
T: 1 ( 4119) P:80 I:1500 C: 333338 Min: 2 Act: 20 Avg: 11 Max: 49
Over time (~6hr run), Max grew to about 300us
3.12.5-rt6 (with the iwlwifi patches):
cyclictest -p80 -i 1000 -a -n -m -t2
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 0.35 0.44 0.40 2/518 4244
T: 0 ( 3132) P:80 I:1000 C:1492239 Min: 2 Act: 3 Avg: 2 Max: 3089
T: 1 ( 3133) P:80 I:1500 C: 994824 Min: 2 Act: 3 Avg: 4 Max: 2206
Granted, this was a longer run, but a 3ms spike is pretty awful. Still
trying to recreate that with traces running, but no luck so
far. Removing the iwlwifi module gives low values for cyclictest,
consistent with 3.12.1-rt4 (with iwlwifi disabled).
Emmanuel Grumbach (10):
iwlwifi: pcie: clean up ICT allocation code
iwlwifi: pcie: track interrupt mask in SW
iwlwifi: pcie: re-organize the PCIe ISR code
iwlwifi: pcie: move the ICT / non-ICT handling functions
iwlwifi: pcie: read the interrupt cause from the handler
iwlwifi: pcie: determine the interrupt type in the handler
iwlwifi: pcie: return inta from iwl_pcie_int_cause_{non_}ict
iwlwifi: pcie: no need to save inta in trans_pcie
iwlwifi: pcie: move interrupt prints to the common handler
iwlwifi: pcie: stop using _irqsave
drivers/net/wireless/iwlwifi/iwl-csr.h | 3 +-
drivers/net/wireless/iwlwifi/pcie/internal.h | 9 +-
drivers/net/wireless/iwlwifi/pcie/rx.c | 393 +++++++++++---------------
drivers/net/wireless/iwlwifi/pcie/trans.c | 25 +-
drivers/net/wireless/iwlwifi/pcie/tx.c | 10 +-
5 files changed, 184 insertions(+), 256 deletions(-)
--
1.7.10.4
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