Kaike Wan bcad29137a IB/hfi1: Serve the most starved iowait entry first ... When an egress resource(SDMA descriptors, pio credits) is not available, a sending thread will be put on the resource's wait queue. When the resource becomes available again, up to a fixed number of sending threads can be awakened sequentially and removed from the wait queue, depending on the number of waiting threads and the number of free resources. Since each awakened sending thread will send as many packets as possible, it is highly likely that the first sending thread will consume all the egress resources. Subsequently, it will be put back to the end of the wait queue. Depending on the timing when the later sending threads wake up, they may not be able to send any packet and be again put back to the end of the wait queue sequentially, right behind the first sending thread. This starvation cycle continues until some sending threads exceed their retry limit and consequently fail. This patch fixes the issue by two simple approaches: (1) Any starved sending thread will be put to the head of the wait queue while a served sending thread will be put to the tail; (2) The most starved sending thread will be served first. Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Kaike Wan <kaike.wan@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>		2017-07-31 15:17:54 -04:00
..
affinity.c	IB/hfi1: Replace deprecated pci functions with new API	2017-06-27 16:58:11 -04:00
affinity.h	IB/hfi1: Name function prototype parameters for affinity module	2017-06-27 16:56:33 -04:00
aspm.h	IB/hfi1: Virtual Network Interface Controller (VNIC) HW support	2017-04-20 15:19:35 -04:00
chip_registers.h	RDMA/hfi1: Defer setting VL15 credits to link-up interrupt	2017-06-01 17:04:20 -04:00
chip.c	IB/hfi1: Fix bar0 mapping to use write combining	2017-07-31 15:17:54 -04:00
chip.h	IB/hfi1: Fix bar0 mapping to use write combining	2017-07-31 15:17:54 -04:00
common.h	IB/hfi1: Setup common IB fields in hfi1_packet struct	2017-06-27 16:56:33 -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	infiniband: utilize the new cdev_set_parent function	2017-03-21 06:44:33 +01:00
device.h
driver.c	IB/hfi1: Fix bar0 mapping to use write combining	2017-07-31 15:17:54 -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: Handle missing magic values in config file	2017-06-27 16:58:13 -04:00
eprom.h	IB/hfi1: Add ability to read platform config from the EPROM	2016-10-02 08:42:20 -04:00
exp_rcv.c	IB/hfi1: Initialize TID lists to avoid crash on cleanup	2017-06-27 16:58:13 -04:00
exp_rcv.h	IB/hfi1: Fix bar0 mapping to use write combining	2017-07-31 15:17:54 -04:00
file_ops.c	IB/hfi1: Fix bar0 mapping to use write combining	2017-07-31 15:17:54 -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: Fix bar0 mapping to use write combining	2017-07-31 15:17:54 -04:00
init.c	IB/hfi1: Resolve kernel panics by reference counting receive contexts	2017-06-27 16:58:13 -04:00
intr.c	RDMA/hfi1: Defer setting VL15 credits to link-up interrupt	2017-06-01 17:04:20 -04:00
iowait.h	IB/hfi1: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
Kconfig	Second round of merge items for 4.8	2016-08-04 20:26:31 -04:00
mad.c	IB/hfi1,qib: Do not send QKey trap for UD qps	2017-06-27 16:58:12 -04:00
mad.h	IB/core,rdmavt,hfi1,opa-vnic: Send OPA cap_mask3 in trap	2017-06-27 16:58:12 -04:00
Makefile	IB/hfi1: Create common expected receive verbs/PSM code	2017-06-27 16:58:13 -04:00
mmu_rb.c	IB/hfi1: Don't remove RB entry when not needed.	2017-06-27 16:56:33 -04:00
mmu_rb.h	IB/hfi1: Don't remove RB entry when not needed.	2017-06-27 16:56:33 -04:00
opa_compat.h
pcie.c	IB/hfi1: Fix bar0 mapping to use write combining	2017-07-31 15:17:54 -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: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
pio.h	IB/hfi: Fix up comments in engine mapping	2017-04-25 15:24:51 -04:00
platform.c	IB/hfi1: Remove reading platform configuration from EFI variable	2017-06-27 16:58:13 -04:00
platform.h	IB/hfi1: Define platform_config_table_limits once	2016-12-11 15:29:42 -05:00
qp.c	IB/hfi1: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
qp.h	IB/{rdmavt, qib, hfi1}: Remove gfp flags argument	2017-07-17 21:21:23 -04:00
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: Setup common IB fields in hfi1_packet struct	2017-06-27 16:56:33 -04:00
ruc.c	IB/hfi1: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
sdma_txreq.h
sdma.c	IB/hfi1: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
sdma.h	IB/hfi1: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
sysfs.c	RDMA/hfi1: fix array termination by appending NULL to attr array	2017-06-01 17:03:19 -04:00
trace_ctxts.h	IB/hfi1: Clean up context initialization	2017-05-04 19:31:46 -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: Separate input/output header tracing	2017-06-27 16:56:33 -04:00
trace_misc.h	IB/hfi1: Add traces for TID operations	2017-06-27 16:58:13 -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: Add traces for TID operations	2017-06-27 16:58:13 -04:00
trace_tx.h	IB/hfi1: Fix yield logic in send engine	2017-05-04 19:31:46 -04:00
trace.c	IB/hfi1: Separate input/output header tracing	2017-06-27 16:56:33 -04:00
trace.h	IB/hfi1: Separate tracepoints into specific headers	2016-08-02 12:00:54 -04:00
uc.c	IB/hfi1: Setup common IB fields in hfi1_packet struct	2017-06-27 16:56:33 -04:00
ud.c	IB/hfi1,qib: Do not send QKey trap for UD qps	2017-06-27 16:58:12 -04:00
user_exp_rcv.c	IB/hfi1: Fix bar0 mapping to use write combining	2017-07-31 15:17:54 -04:00
user_exp_rcv.h	IB/hfi1: Create common expected receive verbs/PSM code	2017-06-27 16:58:13 -04:00
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: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
user_sdma.h	IB/hfi1: Fix an assign/ordering issue with shared context IDs	2017-05-04 19:31:46 -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/hfi1: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
verbs.h	IB/hfi1: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
vnic_main.c	Merge branch 'hfi1' into k.o/for-4.14	2017-07-24 08:33:43 -04:00
vnic_sdma.c	IB/hfi1: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00
vnic.h	IB/hfi1: Serve the most starved iowait entry first	2017-07-31 15:17:54 -04:00