[dpdk-dev] [PATCH] compressdev: add feature flag to specify where processing is done

[Trahe, Fiona]

Hi Stephen

//snip//
> > > Subject: Re: [dpdk-dev] [PATCH] compressdev: add feature flag to specify where processing is done
> > >
> > > On Tue, 20 Nov 2018 01:39:48 +0000
> > > Fiona Trahe <fiona.trahe at intel.com> wrote:
> > >
> > > > A new device feature flag, RTE_COMPDEV_FF_SW_OP_DONE_IN_DEQUEUE
> > > > is added. A PMD which processes operations using a software
> > > > acceleration engine should set this if the bulk of the
> > > > processing is done during the dequeue. It should leave it
> > > > cleared if the bulk of the processing is done during the
> > > > enqueue (default).
> > > > An application may find this useful for tuning.
> > > >
> > > > Signed-off-by: Fiona Trahe <fiona.trahe at intel.com>
> > >
> > > What application? or is this "if we build it they will come?"
> > [Fiona] Our storage team asked for this, so not quite.
> > Seems like it might by generically useful, so a bit of the latter too :)
> > Would you prefer I removed that line?
> 
> Hopefully, there would be one or more open source projects using the API.
> I just did a survey of DPDK an 1/3 of it is never used by any open source
> project.  Hate to see more dead code and special cases created.
> 
> At least, some example code in examples would help. Something like a simple
> in memory compressed storage server using a network API (SMB?/SSH?/FTP?)
[Fiona] There is no compressdev sample app yet. 
However I've double-checked with the SPDK team, they're currently integrating
compressdev and intend to push a patch to SPDK - a storage open-source project - using this flag.