[dpdk-dev] [PATCH v6 1/1] eventdev: add new software event timer adapter

Jerin Jacob Kollanukkaran jerinj at marvell.com
Wed Jun 5 15:34:37 CEST 2019


> -----Original Message-----
> From: Carrillo, Erik G <erik.g.carrillo at intel.com>
> Sent: Saturday, April 27, 2019 12:29 AM
> To: Honnappa Nagarahalli <Honnappa.Nagarahalli at arm.com>;
> jerin.jacob at caviumnetworks.com
> Cc: mattias.ronnblom at ericsson.com; pbhagavatula at caviumnetworks.com;
> dev at dpdk.org; nd <nd at arm.com>; nd <nd at arm.com>
> Subject: RE: [dpdk-dev] [PATCH v6 1/1] eventdev: add new software event timer
> adapter
> 
> 
> 
> > -----Original Message-----
> > From: Honnappa Nagarahalli [mailto:Honnappa.Nagarahalli at arm.com]
> > Sent: Friday, April 26, 2019 1:51 PM
> > To: Carrillo, Erik G <erik.g.carrillo at intel.com>;
> > jerin.jacob at caviumnetworks.com
> > Cc: mattias.ronnblom at ericsson.com; pbhagavatula at caviumnetworks.com;
> > dev at dpdk.org; Honnappa Nagarahalli <Honnappa.Nagarahalli at arm.com>; nd
> > <nd at arm.com>; nd <nd at arm.com>
> > Subject: RE: [dpdk-dev] [PATCH v6 1/1] eventdev: add new software
> > event timer adapter
> >
> > Hi Erik,
> > 	A quick question.
> >
> > > -----Original Message-----
> > > From: dev <dev-bounces at dpdk.org> On Behalf Of Erik Gabriel Carrillo
> > > Sent: Friday, April 26, 2019 10:14 AM
> > > To: jerin.jacob at caviumnetworks.com
> > > Cc: mattias.ronnblom at ericsson.com;
> > pbhagavatula at caviumnetworks.com;
> > > dev at dpdk.org
> > > Subject: [dpdk-dev] [PATCH v6 1/1] eventdev: add new software event
> > > timer adapter
> > >
> > > This patch introduces a new version of the event timer adapter
> > > software
> > PMD.
> > > In the original design, timer event producer lcores in the primary
> > > and secondary processes enqueued event timers into a ring, and a
> > > service core in the primary process dequeued them and processed them
> further.
> > > To improve performance, this version does away with the ring and

In general idea and patch looks good to me.
Could you update git commit log with 
# Percentage of performance improvement seen with this method?
# Means(test command etc) of measuring the performance improvement?



> > > lets lcores in both primary and secondary processes insert timers
> > > directly into timer skiplist data structures; the service core
> > > directly accesses the lists as well, when looking for timers that have expired.
> > How do you ensure concurrent access to the timer skiplist? Are you
> > using any locks or is it a lock-free data structure?
> >
> > <snip>
> 
> There are multiple timer skiplists,  one for each lcore, and each has its lock that
> is acquired as necessary when adding or removing timers from the skiplists.  This
> locking occurs in the underlying timer library, in the timer reset and stop
> functions.
> 
> Regards,
> Erik


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