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4a4caa29f1
linux/drivers/target
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Nicholas Bellinger 4a4caa29f1 iscsi-target: Pre-allocate more tags to avoid ack starvation 
This patch addresses an traditional iscsi-target fabric ack starvation
issue where iscsit_allocate_cmd() -> percpu_ida_alloc_state() ends up
hitting slow path percpu-ida code, because iscsit_ack_from_expstatsn()
is expected to free ack'ed tags after tag allocation.

This is done to take into account the tags waiting to be acknowledged
and released in iscsit_ack_from_expstatsn(), but who's number are not
directly limited by the CmdSN Window queue_depth being enforced by
the target.

So that said, this patch bumps up the pre-allocated number of
per session tags to:

  (max(queue_depth, ISCSIT_MIN_TAGS) * 2) + ISCSIT_EXTRA_TAGS

for good measure to avoid the percpu_ida_alloc_state() slow path.

Cc: <stable@vger.kernel.org> #3.12+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2014-01-19 10:59:05 +00:00
..
iscsi iscsi-target: Pre-allocate more tags to avoid ack starvation 2014-01-19 10:59:05 +00:00
loopback tcm_loop: Enable DIF/DIX modes in SCSI host LLD 2014-01-19 02:22:06 +00:00
sbp target: Remove TF_CIT_TMPL macro 2013-10-16 13:35:02 -07:00
tcm_fc drivers: target: Mark functions and structures as static in tfc_conf.c 2014-01-09 21:48:37 -08:00
Kconfig target/iblock: Add blk_integrity + BIP passthrough support 2014-01-18 10:14:22 +00:00
Makefile target: Add support for EXTENDED_COPY copy offload emulation 2013-09-10 16:48:43 -07:00
target_core_alua.c target_core_alua: check for buffer overflow 2014-01-09 21:48:38 -08:00
target_core_alua.h target_core_alua: Referrals configfs integration 2014-01-09 21:48:35 -08:00
target_core_configfs.c target/configfs: Expose protection device attributes 2014-01-18 09:57:47 +00:00
target_core_device.c target/configfs: Expose protection device attributes 2014-01-18 09:57:47 +00:00
target_core_fabric_configfs.c target: Fix sizeof in kmalloc for some default_groups arrays 2013-12-16 12:42:20 -08:00
target_core_fabric_lib.c target: Update copyright ownership/year information to 2013 2013-09-10 20:23:36 -07:00
target_core_file.c target/file: Add DIF protection support to fd_execute_rw 2014-01-19 02:21:55 +00:00
target_core_file.h target/file: Add DIF protection support to fd_execute_rw 2014-01-19 02:21:55 +00:00
target_core_hba.c target: Update copyright ownership/year information to 2013 2013-09-10 20:23:36 -07:00
target_core_iblock.c target/iblock: Add blk_integrity + BIP passthrough support 2014-01-18 10:14:22 +00:00
target_core_iblock.h target: kill struct se_subsystem_dev 2012-11-06 20:55:43 -08:00
target_core_internal.h target/configfs: Expose protection device attributes 2014-01-18 09:57:47 +00:00
target_core_pr.c target core: rename (ex,im)plict -> (ex,im)plicit 2013-11-20 11:24:40 -08:00
target_core_pr.h drivers: target: Move prototype declaration of function to header file target_core_pr.h 2014-01-09 21:48:36 -08:00
target_core_pscsi.c target/pscsi: fix return value check 2013-10-25 10:42:09 -07:00
target_core_pscsi.h target: kill struct se_subsystem_dev 2012-11-06 20:55:43 -08:00
target_core_rd.c target/rd: Add DIF protection into rd_execute_rw 2014-01-19 02:22:06 +00:00
target_core_rd.h target/rd: Add support for protection SGL setup + release 2014-01-19 02:22:05 +00:00
target_core_sbc.c target/sbc: Add P_TYPE + PROT_EN bits to READ_CAPACITY_16 2014-01-18 09:53:13 +00:00
target_core_spc.c target/spc: Expose ATO bit in control mode page 2014-01-18 09:53:14 +00:00
target_core_stat.c target: Convert se_device statistics to atomic_long_t 2013-11-13 18:34:55 -08:00
target_core_tmr.c target: Convert se_device statistics to atomic_long_t 2013-11-13 18:34:55 -08:00
target_core_tpg.c target: Don't use void* when passing dev in core_tpg_add_lun 2013-12-16 13:29:20 -08:00
target_core_transport.c target: Add protection SGLs to target_submit_cmd_map_sgls 2014-01-18 09:58:09 +00:00
target_core_ua.c target: Remove unused ua_dev_list member in struct se_ua 2013-12-16 12:39:04 -08:00
target_core_ua.h target core: rename (ex,im)plict -> (ex,im)plicit 2013-11-20 11:24:40 -08:00
target_core_xcopy.c drivers: target: Move prototype declaration of function to header file target_core_pr.h 2014-01-09 21:48:36 -08:00
target_core_xcopy.h target: Add support for EXTENDED_COPY copy offload emulation 2013-09-10 16:48:43 -07:00