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

[Honnappa Nagarahalli]

<snip>

> 
> On Mon, 28 Sep 2020 14:03:27 -0500
> Honnappa Nagarahalli <honnappa.nagarahalli at arm.com> wrote:
> 
> > 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.
> >
> > Fixes: 09c7e63a71f9 ("net/memif: introduce memory interface PMD")
> > Cc: jgrajcia at cisco.com
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> > Reviewed-by: Phil Yang <phil.yang at arm.com>
> > Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
> 
> This patch series will conflict with the pending master/slave patchset.
> Please let the master/slave renaming go in first.
+1, review can go on.