[dpdk-dev] [PATCH 0/3] *** timer library enhancements ***

Gabriel Carrillo erik.g.carrillo at intel.com
Wed Aug 23 16:47:21 CEST 2017


In the current implementation of the DPDK timer library, timers can be
created and set to be handled by a target lcore by adding it to a
skiplist that corresponds to that lcore.  However, if an application
enables multiple lcores, and each of these lcores repeatedly attempts
to install timers on the same target lcore, overall application
throughput will be reduced as all lcores contend to acquire the lock
guarding the single skiplist of pending timers. 

This patchset addresses this scenario by adding an array of skiplists
to each lcore's priv_timer struct, such that when lcore i installs a
timer on lcore k, the timer will be added to the ith skiplist for
lcore k.  If lcore j installs a timer on lcore k simultaneously,
lcores i and j can both proceed since they will be acquiring different
locks for different lists. 

When lcore k processes its pending timers, it will traverse each skiplist
in its array and acquire a skiplist's lock while a run list is broken
out; meanwhile, all other lists can continue to be modified.  Then, all
run lists for lcore k are collected and traversed together so timers are
executed in their global order. 

Gabriel Carrillo (3):
  timer: add per-installer pending lists for each lcore
  timer: handle timers installed from non-EAL threads
  doc: update timer lib docs

 doc/guides/prog_guide/timer_lib.rst |  19 ++-
 lib/librte_timer/rte_timer.c        | 329 +++++++++++++++++++++++-------------
 lib/librte_timer/rte_timer.h        |   9 +-
 3 files changed, 231 insertions(+), 126 deletions(-)

-- 
2.6.4



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