Re: [dpdk-dev] [PATCH v3 1/2] examples: add performance thread sample application

["Kulasek, TomaszX" <tomaszx.kulasek@intel.com>]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of ibetts
> Sent: Tuesday, November 17, 2015 13:11
> To: dev@dpdk.org
> Cc: Betts, Ian
> Subject: [dpdk-dev] [PATCH v3 1/2] examples: add performance thread
> sample application
> 
> From: Ian Betts <ian.betts@intel.com>
> 
> This example comprises a layer 3 forwarding derivative intended to
> facilitate characterization of performance with different
> threading models, specifically:-
> 
> 1. EAL threads running on different physical cores
> 2. EAL threads running on the same physical core
> 3. Lightweight threads running in an EAL thread
> 
> Purpose and justification
> 
> Since dpdk 2.0 it has been possible to assign multiple EAL threads to
> a physical core ( case 2 above ).
> Currently no example application has focused on demonstrating the
> performance constraints of differing threading models.
> 
> Whilst purpose built applications that fully comprehend the DPDK
> single threaded programming model will always yield superior
> performance, the desire to preserve ROI in legacy code written for
> multithreaded operating environments  makes lightweight threads
> (case 3 above) worthy of consideration.
> 
> As well as aiding with legacy code reuse, it is anticipated that
> lightweight threads will make it possible to scale a multithreaded
> application with fine granularity allowing an application  to more
> easily take advantage of headroom on EAL cores, or conversely occupy
> more cores, as dictated by system load.
> 
> To explore performance with lightweight threads a simple cooperative
> scheduler subsystem is being included in this example application.
> If the expected benefits and use cases prove to be of value, it is
> anticipated that this lightweight thread subsystem would become a
> library in some future DPDK release.
> 
> Signed-off-by: Ian Betts <ian.betts@intel.com>
> ---

Acked-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>