From: "Jakub Grajciar -X (jgrajcia - PANTHEON TECH SRO at Cisco)" <jgrajcia@cisco.com>
To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
"dev@dpdk.org" <dev@dpdk.org>, Phil Yang <Phil.Yang@arm.com>,
"ferruh.yigit@intel.com" <ferruh.yigit@intel.com>
Cc: nd <nd@arm.com>, "stable@dpdk.org" <stable@dpdk.org>, nd <nd@arm.com>
Subject: Re: [dpdk-stable] [PATCH v2 1/8] net/memif: do not update local copy of tail in tx function
Date: Fri, 9 Oct 2020 11:23:51 +0000 [thread overview]
Message-ID: <BN8PR11MB3572E3634BFD479200B6A38BDF080@BN8PR11MB3572.namprd11.prod.outlook.com> (raw)
In-Reply-To: <DBAPR08MB58145A6AA444F7FC2C725527980A0@DBAPR08MB5814.eurprd08.prod.outlook.com>
> > -----Original Message-----
> > From: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> > Sent: Monday, September 28, 2020 2:03 PM
> > To: dev@dpdk.org; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>;
> > Phil Yang <Phil.Yang@arm.com>; jgrajcia@cisco.com;
> > ferruh.yigit@intel.com
> > Cc: nd <nd@arm.com>; stable@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@cisco.com>
next prev parent reply other threads:[~2020-10-09 11:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-21 19:22 [dpdk-stable] [PATCH 1/4] " Honnappa Nagarahalli
2020-09-21 19:22 ` [dpdk-stable] [PATCH 2/4] net/memif: relax the load of ring tail pointer for M2S ring Honnappa Nagarahalli
2020-09-21 19:22 ` [dpdk-stable] [PATCH 3/4] net/memif: relax the load of ring head pointer for S2M ring Honnappa Nagarahalli
2020-09-21 19:22 ` [dpdk-stable] [PATCH 4/4] net/memif: relax the load of ring head pointer for M2S ring Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-stable] [PATCH v2 1/8] net/memif: do not update local copy of tail in tx function Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-stable] [PATCH v2 2/8] net/memif: relax the load of ring tail pointer for M2S ring Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-stable] [PATCH v2 3/8] net/memif: relax the load of ring head " Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-stable] [PATCH v2 4/8] net/memif: relax the load of ring head pointer for S2M ring Honnappa Nagarahalli
2020-09-28 20:53 ` [dpdk-stable] [dpdk-dev] [PATCH v2 1/8] net/memif: do not update local copy of tail in tx function Stephen Hemminger
2020-09-29 5:24 ` Honnappa Nagarahalli
2020-10-07 17:08 ` [dpdk-stable] " Honnappa Nagarahalli
2020-10-09 11:23 ` Jakub Grajciar -X (jgrajcia - PANTHEON TECH SRO at Cisco) [this message]
2020-10-09 15:59 ` Ferruh Yigit
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