[dpdk-dev] [PATCH v2 1/8] net/memif: do not update local copy of tail in tx function

[Jakub Grajciar -X (jgrajcia - PANTHEON TECH SRO at Cisco)]

> > -----Original Message-----
> > From: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> > Sent: Monday, September 28, 2020 2:03 PM
> > To: dev at dpdk.org; Honnappa Nagarahalli
> <Honnappa.Nagarahalli at arm.com>;
> > Phil Yang <Phil.Yang at arm.com>; jgrajcia at cisco.com;
> > ferruh.yigit at intel.com
> > Cc: nd <nd at arm.com>; stable at dpdk.org
> > Subject: [PATCH v2 1/8] net/memif: do not update local copy of tail in
> > tx function
> >
> > In the case of S2M queues, the receiver synchronizes with the sender (i.e.
> > informs of the packets it has received) using ring->tail.
> > Hence, the sender does not need to update last_tail.
> >
> > In the case of M2S queues, the receiver uses last_tail to keep track
> > of the descriptors it has received. The sender is not required to update the
> last_tail.
> > Updating the last_tail makes it a shared variable between the
> > transmitter and receiver affecting the performance.

Hi Honnappa,

The patch series is looking good.

Reviewed-by: Jakub Grajciar <jgrajcia at cisco.com>