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From: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>
To: rsanford@akamai.com
Cc: dev@dpdk.org, john.mcnamara@intel.com
Subject: [PATCH v4 0/3] timer library enhancement
Date: Tue, 19 Sep 2017 12:02:25 -0500	[thread overview]
Message-ID: <1505840548-77004-1-git-send-email-erik.g.carrillo@intel.com> (raw)
In-Reply-To: <1505340308-86141-1-git-send-email-erik.g.carrillo@intel.com>

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 option to enable an
array of skiplists in each lcore's priv_timer struct. Then, 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. This functionality is off by default, and
can be enabled via a new function.

When lcore k processes its pending timers, if the multiple pending list
option is enabled, it will traverse skiplists in its array and acquire 
the current 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 relative order. If the multiple pending list option is not enabled
(the default), only a single list will be traversed, as before.

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

 doc/guides/prog_guide/timer_lib.rst    |  31 +--
 doc/guides/rel_notes/release_17_11.rst |   7 +
 lib/librte_timer/rte_timer.c           | 384 ++++++++++++++++++++++-----------
 lib/librte_timer/rte_timer.h           |  29 ++-
 lib/librte_timer/rte_timer_version.map |   6 +
 5 files changed, 321 insertions(+), 136 deletions(-)

-- 
2.6.4

  parent reply	other threads:[~2017-09-19 17:00 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-23 14:47 [PATCH 0/3] *** timer library enhancements *** Gabriel Carrillo
2017-08-23 14:47 ` [PATCH 1/3] timer: add per-installer pending lists for each lcore Gabriel Carrillo
2017-08-25 20:27   ` [PATCH v2 " Gabriel Carrillo
2017-08-29 10:57     ` Ananyev, Konstantin
2017-08-29 16:13       ` Carrillo, Erik G
2017-08-29 15:11   ` [PATCH " Stephen Hemminger
2017-08-23 14:47 ` [PATCH 2/3] timer: handle timers installed from non-EAL threads Gabriel Carrillo
2017-08-25 20:27   ` [PATCH v2 " Gabriel Carrillo
2017-08-23 14:47 ` [PATCH 3/3] doc: update timer lib docs Gabriel Carrillo
2017-08-25 20:27   ` [PATCH v2 " Gabriel Carrillo
2017-08-23 15:02 ` [PATCH 0/3] *** timer library enhancements *** Wiles, Keith
2017-08-23 16:19   ` Carrillo, Erik G
2017-08-23 16:50     ` Wiles, Keith
2017-08-23 19:28       ` Carrillo, Erik G
2017-08-23 21:04         ` Wiles, Keith
2017-08-24 14:08           ` Carrillo, Erik G
2017-08-25 20:26 ` [PATCH v2 " Gabriel Carrillo
2017-09-13 22:05   ` [PATCH v3 0/3] timer library enhancement Erik Gabriel Carrillo
2017-09-13 22:05     ` [PATCH v3 1/3] timer: add multiple pending lists option for each lcore Erik Gabriel Carrillo
2017-09-13 22:05     ` [PATCH v3 2/3] timer: handle timers installed from non-EAL threads Erik Gabriel Carrillo
2017-09-13 22:05     ` [PATCH v3 3/3] doc: update timer lib docs Erik Gabriel Carrillo
2017-09-18 16:19       ` Mcnamara, John
2017-09-19 17:04         ` Carrillo, Erik G
2017-09-19 17:02     ` Erik Gabriel Carrillo [this message]
2017-09-19 17:02       ` [PATCH v4 1/3] timer: add multiple pending lists option for each lcore Erik Gabriel Carrillo
2017-09-19 17:02       ` [PATCH v4 2/3] timer: handle timers installed from non-EAL threads Erik Gabriel Carrillo
2017-09-19 17:02       ` [PATCH v4 3/3] doc: update timer lib docs Erik Gabriel Carrillo
2017-10-11 20:42       ` [PATCH v4 0/3] timer library enhancement Thomas Monjalon
2018-04-04 22:42         ` Thomas Monjalon
2018-04-05 21:53           ` Carrillo, Erik G

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