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dd1ed10817
linux/drivers/infiniband/hw/hfi1
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Mike Marciniszyn dd1ed10817 IB/hfi1: Fix yield logic in send engine 
When there are many RC QPs and an RDMA READ request
is sent, timeouts occur on the requester side because
of fairness among RC QPs on their relative SDMA engine
on the responder side.  This also hits write and send, but
to a lesser extent.

Complicating the issue is that the current code checks if workqueue
is congested before scheduling other QPs, however, this
check is based on the number of active entries in the
workqueue, which was found to be too big to for
workqueue_congested() to be effective.

Fix by reducing the number of active entries as revealed by
experimentation from the default of num_sdma to
HFI1_MAX_ACTIVE_WORKQUEUE_ENTRIES.  Retry counts were monitored
to determine the correct value.

Tracing to investigate any future issues is also added.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-05-04 19:31:46 -04:00
..
affinity.c sched/core: Remove the tsk_cpus_allowed() wrapper 2017-03-02 08:42:24 +01:00
affinity.h Updates for 4.10 kernel merge window 2016-12-15 12:03:32 -08:00
aspm.h IB/hfi1: Virtual Network Interface Controller (VNIC) HW support 2017-04-20 15:19:35 -04:00
chip_registers.h IB/hfi1: Add active channel and backplane support for integrated devices 2016-11-15 16:37:27 -05:00
chip.c IB/hfi1: Fix checks for Offline transient state 2017-05-04 19:31:46 -04:00
chip.h IB/hfi1: Virtual Network Interface Controller (VNIC) HW support 2017-04-20 15:19:35 -04:00
common.h IB/hfi1: Use defines from common headers 2017-04-28 13:48:01 -04:00
debugfs.c IB/hfi1: Virtual Network Interface Controller (VNIC) HW support 2017-04-20 15:19:35 -04:00
debugfs.h IB/hfi1: Add transmit fault injection feature 2017-04-05 14:45:09 -04:00
device.c
device.h
driver.c IB/core: Use rdma_ah_attr accessor functions 2017-05-01 14:32:43 -04:00
efivar.c IB/hfi1: Check upper-case EFI variables 2017-02-19 09:18:37 -05:00
efivar.h
eprom.c IB/hfi1: Read new EPROM format 2016-12-11 15:25:13 -05:00
eprom.h IB/hfi1: Add ability to read platform config from the EPROM 2016-10-02 08:42:20 -04:00
file_ops.c IB/hfi: Protect against writable mmap 2017-04-28 13:56:23 -04:00
firmware.c IB/hfi1: Add a patch value to the firmware version string 2017-04-05 14:45:09 -04:00
hfi.h IB/hfi1: Use bool in process_ecn 2017-04-28 13:56:24 -04:00
init.c IB/hfi1: Fix yield logic in send engine 2017-05-04 19:31:46 -04:00
intr.c IB/hfi1: Cache neighbor secure data after link up 2017-04-28 13:56:20 -04:00
iowait.h IB/hfi1: Add unique txwait_lock for txreq events 2016-11-15 16:25:59 -05:00
Kconfig Second round of merge items for 4.8 2016-08-04 20:26:31 -04:00
mad.c IB/core: Use rdma_ah_attr accessor functions 2017-05-01 14:32:43 -04:00
mad.h IB/hfi1: Clean up port state structure definition 2016-08-02 12:00:54 -04:00
Makefile IB/hfi1: VNIC SDMA support 2017-04-20 15:19:41 -04:00
mmu_rb.c IB/hfi1: constify mmu_notifier_ops structure 2016-12-11 15:29:42 -05:00
mmu_rb.h IB/hfi1: Remove unneeded mm argument in remove function 2016-08-02 22:46:21 -04:00
opa_compat.h
pcie.c IB/hfi1: Convert %Lx to %llx 2017-04-28 13:56:22 -04:00
pio_copy.c IB/hfi1: Optimize pio_buf and send_context structs 2016-11-15 16:37:27 -05:00
pio.c IB/hfi1: Virtual Network Interface Controller (VNIC) HW support 2017-04-20 15:19:35 -04:00
pio.h IB/hfi: Fix up comments in engine mapping 2017-04-25 15:24:51 -04:00
platform.c IB/hfi1: Add special setting for low power AOC 2016-12-11 15:29:42 -05:00
platform.h IB/hfi1: Define platform_config_table_limits once 2016-12-11 15:29:42 -05:00
qp.c IB/hfi1, IB/rdmavt: Move r_adefered to r_lock cache line 2017-05-04 19:31:46 -04:00
qp.h IB/hfi1, qib, rdmavt: Move AETH credit functions into rdmavt 2017-02-19 09:18:38 -05:00
qsfp.c IB/hfi1: Extend i2c timeout 2016-10-02 08:42:13 -04:00
qsfp.h IB/hfi1: Fetch monitor values on-demand for CableInfo query 2016-08-22 14:31:41 -04:00
rc.c IB/hfi1, IB/rdmavt: Move r_adefered to r_lock cache line 2017-05-04 19:31:46 -04:00
ruc.c IB/hfi1: Fix yield logic in send engine 2017-05-04 19:31:46 -04:00
sdma_txreq.h
sdma.c IB/hfi1: Ensure VL index is within bounds 2017-04-05 14:45:09 -04:00
sdma.h IB/hfi: Fix up comments in engine mapping 2017-04-25 15:24:51 -04:00
sysfs.c IB/hfi1: Virtual Network Interface Controller (VNIC) HW support 2017-04-20 15:19:35 -04:00
trace_ctxts.h IB/hfi1: Fix user-space buffers mapping with IOMMU enabled 2016-10-02 08:42:07 -04:00
trace_dbg.h IB/hfi1: Separate tracepoints into specific headers 2016-08-02 12:00:54 -04:00
trace_ibhdrs.h IB/hfi1: Use defines from common headers 2017-04-28 13:48:01 -04:00
trace_misc.h IB/hfi1: Add receive fault injection feature 2017-04-05 14:45:09 -04:00
trace_rc.h IB/rdmavt, IB/hfi1: Fix timer migration regressions 2017-04-05 14:45:09 -04:00
trace_rx.h IB/hfi1: Remove leftover snoop references 2016-11-15 16:16:43 -05:00
trace_tx.h IB/hfi1: Fix yield logic in send engine 2017-05-04 19:31:46 -04:00
trace.c IB/hfi1: Add functions to parse 9B headers 2017-04-28 13:48:01 -04:00
trace.h IB/hfi1: Separate tracepoints into specific headers 2016-08-02 12:00:54 -04:00
uc.c IB/core: Use rdma_ah_attr accessor functions 2017-05-01 14:32:43 -04:00
ud.c IB/core: Use rdma_ah_attr accessor functions 2017-05-01 14:32:43 -04:00
user_exp_rcv.c IB/hfi1: Validate the TID count before using it 2017-04-28 13:48:01 -04:00
user_exp_rcv.h
user_pages.c IB/hfi1: Virtual Network Interface Controller (VNIC) HW support 2017-04-20 15:19:35 -04:00
user_sdma.c IB/hfi1: Coding style improvement (make sizeof use safer) 2017-04-20 16:25:04 -04:00
user_sdma.h IB/hfi1: Use evict mmu rb operation 2016-08-02 22:46:21 -04:00
verbs_txreq.c IB/hfi1: Add unique txwait_lock for txreq events 2016-11-15 16:25:59 -05:00
verbs_txreq.h IB/hfi1: Remove dependence on qp->s_cur_size 2016-12-11 15:25:13 -05:00
verbs.c IB/core: Define 'ib' and 'roce' rdma_ah_attr types 2017-05-01 14:32:43 -04:00
verbs.h IB/hfi1: Fix yield logic in send engine 2017-05-04 19:31:46 -04:00
vnic_main.c IB/hfi1: VNIC SDMA support 2017-04-20 15:19:41 -04:00
vnic_sdma.c IB/hfi1: VNIC SDMA support 2017-04-20 15:19:41 -04:00
vnic.h IB/hfi1: VNIC SDMA support 2017-04-20 15:19:41 -04:00