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From: Thomas Monjalon <thomas@monjalon.net>
To: rsanford@akamai.com
Cc: dev@dpdk.org, Erik Gabriel Carrillo <erik.g.carrillo@intel.com>,
	john.mcnamara@intel.com
Subject: Re: [PATCH v4 0/3] timer library enhancement
Date: Wed, 11 Oct 2017 22:42:26 +0200	[thread overview]
Message-ID: <53861185.JAf0AvXReA@xps> (raw)
In-Reply-To: <1505840548-77004-1-git-send-email-erik.g.carrillo@intel.com>

This patchset is waiting for review.

Robert, are you available?

19/09/2017 19:02, Erik Gabriel Carrillo:
> 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

  parent reply	other threads:[~2017-10-11 20:42 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     ` [PATCH v4 0/3] timer library enhancement Erik Gabriel Carrillo
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       ` Thomas Monjalon [this message]
2018-04-04 22:42         ` [PATCH v4 0/3] timer library enhancement Thomas Monjalon
2018-04-05 21:53           ` Carrillo, Erik G

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