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From: Jerin Jacob <jerinjacobk@gmail.com>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: dpdk-dev <dev@dpdk.org>,
	David Marchand <david.marchand@redhat.com>,
	 Ferruh Yigit <ferruh.yigit@intel.com>,
	Olivier Matz <olivier.matz@6wind.com>,
	 Morten Brørup <mb@smartsharesystems.com>,
	 "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	 Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	 Viacheslav Ovsiienko <viacheslavo@nvidia.com>,
	Ajit Khaparde <ajit.khaparde@broadcom.com>,
	 Jerin Jacob <jerinj@marvell.com>,
	Hemant Agrawal <hemant.agrawal@nxp.com>,
	 Ray Kinsella <mdr@ashroe.eu>,
	Neil Horman <nhorman@tuxdriver.com>,
	 Nithin Dabilpuram <ndabilpuram@marvell.com>,
	Kiran Kumar K <kirankumark@marvell.com>
Subject: Re: [dpdk-dev] [PATCH 1/1] mbuf: move pool pointer in first half
Date: Sun, 8 Nov 2020 00:35:38 +0530
Message-ID: <CALBAE1PMq=8KD-C4Au4RTK+aLPp532vBsMJjqad1Pq4YFSWsOQ@mail.gmail.com> (raw)
In-Reply-To: <4509916.LqRtgDRpI1@thomas>

On Sun, Nov 8, 2020 at 12:09 AM Thomas Monjalon <thomas@monjalon.net> wrote:
>
> 07/11/2020 18:12, Jerin Jacob:
> > On Sat, Nov 7, 2020 at 10:04 PM Thomas Monjalon <thomas@monjalon.net> wrote:
> > >
> > > The mempool pointer in the mbuf struct is moved
> > > from the second to the first half.
> > > It should increase performance on most systems having 64-byte cache line,
> >
> > > i.e. mbuf is split in two cache lines.
> >
> > But In any event, Tx needs to touch the pool to freeing back to the
> > pool upon  Tx completion. Right?
> > Not able to understand the motivation for moving it to the first 64B cache line?
> > The gain varies from driver to driver. For example, a Typical
> > ARM-based NPU does not need to
> > touch the pool in Rx and its been filled by HW. Whereas it needs to
> > touch in Tx if the reference count is implemented.

See below.

> >
> > > Due to this change, tx_offload is moved, so some vector data paths
> > > may need to be adjusted. Note: OCTEON TX2 check is removed temporarily!
> >
> > It will be breaking the Tx path, Please just don't remove the static
> > assert without adjusting the code.
>
> Of course not.
> I looked at the vector Tx path of OCTEON TX2,
> it's close to be impossible to understand :)
> Please help!

Off course. Could you check the above section any share the rationale
for this change
and where it helps and how much it helps?


>
>

  reply	other threads:[~2020-11-07 19:05 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-07 15:53 Thomas Monjalon
2020-11-07 17:12 ` Jerin Jacob
2020-11-07 18:39   ` Thomas Monjalon
2020-11-07 19:05     ` Jerin Jacob [this message]
2020-11-07 20:33       ` Thomas Monjalon
2020-11-09  5:18         ` Jerin Jacob
2020-11-09  8:04           ` Thomas Monjalon
2020-11-09  8:27             ` Jerin Jacob
2020-11-09  9:47               ` Bruce Richardson
2020-11-09 12:01                 ` Jerin Jacob
2020-11-09 12:59                   ` Thomas Monjalon
2020-11-09 13:35                     ` Jerin Jacob
2020-11-09 14:02                       ` Thomas Monjalon
2020-11-09 14:08                         ` Jerin Jacob
2020-11-09 14:42                           ` Thomas Monjalon
2020-11-09 14:53                             ` Jerin Jacob
2020-11-09  8:16           ` Morten Brørup
2020-11-09 10:06             ` [dpdk-dev] [dpdk-techboard] " Bruce Richardson
2020-11-09 10:21               ` Morten Brørup
2020-11-09 18:04                 ` Stephen Hemminger
2020-11-10  7:15                   ` Morten Brørup
2020-11-07 18:57 ` [dpdk-dev] " Morten Brørup
2020-11-09 10:08   ` Bruce Richardson
2020-11-09 10:30     ` Morten Brørup
2020-11-09 10:33     ` Ananyev, Konstantin
2020-11-09 10:36       ` Bruce Richardson
2020-11-09 11:24       ` Ananyev, Konstantin
2020-11-09 21:29 ` [dpdk-dev] [PATCH v2 0/2] move mbuf pool pointer Thomas Monjalon
2020-11-09 21:29   ` [dpdk-dev] [PATCH v2 1/2] drivers: disable OCTEON TX2 in 32-bit build Thomas Monjalon
2020-11-10 18:05     ` Jerin Jacob
2020-11-09 21:29   ` [dpdk-dev] [PATCH v2 2/2] mbuf: move pool pointer in first half Thomas Monjalon
2020-11-10 10:05     ` Morten Brørup
2020-11-10 10:44       ` Thomas Monjalon
2020-11-10 16:25     ` Olivier Matz
2020-11-10 18:06       ` Jerin Jacob
2020-11-12 14:39         ` Thomas Monjalon
2020-11-10 18:08       ` Stephen Hemminger

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