From: Jerin Jacob <jerinjacobk@gmail.com>
To: Ferruh Yigit <ferruh.yigit@amd.com>
Cc: Thomas Monjalon <thomas@monjalon.net>,
Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
Ori Kam <orika@nvidia.com>,
Ivan Malov <ivan.malov@arknetworks.am>,
Nithin Kumar Dabilpuram <ndabilpuram@marvell.com>,
Aman Singh <aman.deep.singh@intel.com>,
Yuying Zhang <yuying.zhang@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
Hanumanth Reddy Pothula <hpothula@marvell.com>,
Slava Ovsiienko <viacheslavo@nvidia.com>,
Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
"david.marchand@redhat.com" <david.marchand@redhat.com>
Subject: Re: [EXT] Re: [PATCH v5 2/2] app/testpmd: add command to process Rx metadata negotiation
Date: Wed, 1 Feb 2023 19:18:17 +0530 [thread overview]
Message-ID: <CALBAE1N1R_Q--6p6CKmbgCPXHA+rOBTfbNL7L2Q8fV9DfcMC1w@mail.gmail.com> (raw)
In-Reply-To: <22a65100-bee8-1726-6e27-14b9028a29d4@amd.com>
On Wed, Feb 1, 2023 at 5:06 PM Ferruh Yigit <ferruh.yigit@amd.com> wrote:
>
> On 2/1/2023 11:15 AM, Jerin Jacob wrote:
> > On Wed, Feb 1, 2023 at 4:35 PM Thomas Monjalon <thomas@monjalon.net> wrote:
> >>
> >> 01/02/2023 11:58, Andrew Rybchenko:
> >>> On 2/1/23 13:48, Jerin Jacob wrote:
> >>>> On Wed, Feb 1, 2023 at 2:59 PM Andrew Rybchenko
> >>>> <andrew.rybchenko@oktetlabs.ru> wrote:
> >>>>> Frankly speaking I don't understand why default value is so
> >>>>> important if we have a way to change it. Reasons should be
> >>>>> really strong to change existing defaults.
> >>>>
> >>>> The only reason is, typically testpmd will be used performance
> >>>> benchmarking as an industry standard. It is difficult to tell/educate
> >>>> the QA or customers
> >>>> that, "BTW if you need to get better performance add more flag to
> >>>> testpmd command line".
> >>
> >> I disagree.
> >> When you do performance benchmark, you tune settings accordingly.
> >
> > IMO, We tune the system resources like queue depth not the disabling
> > features for raw performance.
> > queue depth etc people know to tune so it is obvious. What is not
> > obvious is, testpmd only
> > negotiated some features by default.I am not using that feature, hence
> > I need to explicitly
> > disable it.
> >
>
> When 'rte_eth_rx_metadata_negotiate()' API is NOT used at all, and I
> believe that is the case for almost all applications since API is a
> relatively new one, PMD default behavior should be to enable Rx metadata
> flow rules, in case user requests them later.
>
> So, enabling all in application is same with not calling the API at all.
>
> In this perspective, disabling Rx metadata is additional
> optimization/tuning that application can do if it is sure that Rx
> metadata flow rules won't be used at all.
> And API is more meaningful when it is used to disable Rx metadata.
>
> I think it is reasonable to enable all Rx metadata by default in testpmd
> with a capability to disable it when wanted.
>
> OR
>
> May be we don't call 'rte_eth_rx_metadata_negotiate()' API by default in
> testpmd, it is only called when it is requested explicitly from user,
> enable or disable.
Second option looks good to me.
When
1) user request for action which is needed negotiate(),
AND
2) rte_eth_rx_metadata_negotiate() != ENOSUP
then, testpmd print a warning that need to enable
rte_eth_rx_metadata_negotiate().
> >
> >>
> >>>> To make that worst, only some PMD needs to give the additional
> >>>> parameter to get better number.
> >>>> And also, testpmd usage will be treated as application modeling.
> >>>>
> >>>> Since this feature only used on sfc and cnxk driver, What is the
> >>>> situation with sfc driver?
> >>>> Keeping it as negotiated and not use the feature, will impact the per
> >>>> core performance of sfc or
> >>>> is it just PCI bandwidth thing which really dont show any difference in testpmd?
> >>>
> >>> Yes, sfc could run faster if no Rx metadata are negotiated. So,
> >>> it is better to negotiate nothing by default. But it is always
> >>> painful to change defaults. You need to explain that now you
> >>> need to negotiate Rx metadata to use mark, flag and tunnel offloads.
> >>> Yes, it will be required on sfc and cnxk only.
> >>> As an sfc maintainer I don't mind to change testpmd defaults.
> >>
> >> If we change testpmd defaults to "do nothing",
> >> then we should disable MBUF_FAST_FREE as well.
> >
> > if you see MBUF_FAST_FREE, it does nothing. Actually,
> > !MBUF_FAST_FREE is doing more work.
> >
> >
> >>
> >>
>
next prev parent reply other threads:[~2023-02-01 13:48 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-01 4:41 [PATCH] app/testpmd: add command line argument 'rx-metadata' Hanumanth Pothula
2022-08-01 13:11 ` Hanumanth Pothula
2022-08-01 13:13 ` Hanumanth Pothula
2022-08-01 19:41 ` Ivan Malov
2022-08-02 16:45 ` [PATCH] app/testpmd: add command line argument 'nic-to-pmd-rx-metadata' Hanumanth Pothula
2022-08-02 16:45 ` [PATCH v2 1/2] version: 22.11-rc0 Hanumanth Pothula
2022-08-02 16:45 ` [PATCH v2 2/2] app/testpmd: add command line argument 'nic-to-pmd-rx-metadata' Hanumanth Pothula
2022-08-02 17:51 ` [PATCH v2 1/1] " Hanumanth Pothula
2022-08-30 12:36 ` Hanumanth Reddy Pothula
2022-09-01 8:03 ` Singh, Aman Deep
2022-10-04 14:48 ` Andrew Rybchenko
2022-10-06 18:35 ` [PATCH v3 1/1] app/testpmd: control passing Rx metadata to PMD Hanumanth Pothula
2022-10-17 8:32 ` Andrew Rybchenko
2022-10-27 7:34 ` Thomas Monjalon
2022-10-27 12:54 ` Thomas Monjalon
2022-12-02 16:14 ` [EXT] " Hanumanth Reddy Pothula
2022-12-02 19:41 ` Thomas Monjalon
2022-12-05 7:59 ` Hanumanth Reddy Pothula
2022-12-05 8:28 ` Thomas Monjalon
2022-12-05 9:43 ` Slava Ovsiienko
2022-12-20 20:02 ` [PATCH v4 1/2] ethdev: control Rx metadata negotiation Hanumanth Pothula
2022-12-20 20:02 ` [PATCH v4 2/2] app/testpmd: add command to process " Hanumanth Pothula
2022-12-20 21:23 ` Stephen Hemminger
2022-12-21 2:07 ` [PATCH v5 1/2] ethdev: fix ethdev configuration state on reset Hanumanth Pothula
2022-12-21 2:07 ` [PATCH v5 2/2] app/testpmd: add command to process Rx metadata negotiation Hanumanth Pothula
2023-01-18 10:32 ` Thomas Monjalon
2023-01-19 10:33 ` [EXT] " Hanumanth Reddy Pothula
2023-01-25 12:51 ` Thomas Monjalon
2023-01-24 18:04 ` Ferruh Yigit
2023-01-25 9:30 ` [EXT] " Hanumanth Reddy Pothula
2023-01-25 12:55 ` Thomas Monjalon
2023-01-25 13:55 ` Ferruh Yigit
2023-01-25 13:59 ` Thomas Monjalon
2023-01-25 14:42 ` Nithin Kumar Dabilpuram
2023-01-26 11:03 ` Thomas Monjalon
2023-01-27 5:02 ` Nithin Kumar Dabilpuram
2023-01-27 8:54 ` Thomas Monjalon
2023-01-27 10:42 ` Nithin Kumar Dabilpuram
2023-01-27 15:01 ` Thomas Monjalon
2023-01-31 16:17 ` Jerin Jacob
2023-01-31 23:03 ` Thomas Monjalon
2023-02-01 6:10 ` Ivan Malov
2023-02-01 7:16 ` Andrew Rybchenko
2023-02-01 8:53 ` Jerin Jacob
2023-02-01 9:00 ` Ori Kam
2023-02-01 9:05 ` Thomas Monjalon
2023-02-01 9:07 ` Andrew Rybchenko
2023-02-01 9:14 ` Jerin Jacob
2023-02-01 9:29 ` Andrew Rybchenko
2023-02-01 10:48 ` Jerin Jacob
2023-02-01 10:58 ` Andrew Rybchenko
2023-02-01 11:04 ` Thomas Monjalon
2023-02-01 11:15 ` Jerin Jacob
2023-02-01 11:35 ` Ferruh Yigit
2023-02-01 13:48 ` Jerin Jacob [this message]
2023-02-01 14:50 ` Ferruh Yigit
2023-02-01 15:22 ` Jerin Jacob
2023-02-02 8:43 ` Ferruh Yigit
2023-02-02 8:50 ` Ivan Malov
2023-02-02 9:17 ` Ferruh Yigit
2023-02-02 10:41 ` Ivan Malov
2023-02-02 10:48 ` Ivan Malov
2023-02-02 11:41 ` Thomas Monjalon
2023-02-02 11:55 ` Ivan Malov
2023-02-02 12:03 ` Thomas Monjalon
2023-02-02 12:21 ` Andrew Rybchenko
2023-02-01 11:20 ` Ivan Malov
2023-01-25 13:17 ` Ferruh Yigit
2023-01-25 13:21 ` Ferruh Yigit
2023-01-25 13:21 ` Ferruh Yigit
2023-01-16 10:43 ` [PATCH v5 1/2] ethdev: fix ethdev configuration state on reset Hanumanth Reddy Pothula
2023-01-18 10:29 ` Thomas Monjalon
2023-01-24 18:14 ` Ferruh Yigit
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