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From: Thomas Monjalon <thomas@monjalon.net>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: David Marchand <david.marchand@redhat.com>,
	dev@dpdk.org, Ma Lihong <lihongx.ma@intel.com>,
	Hemant Agrawal <hemant.agrawal@nxp.com>,
	ktraynor@redhat.com, maxime.coquelin@redhat.com,
	olivier.matz@6wind.com, jerinj@marvell.com,
	stephen@networkplumber.org, honnappa.nagarahalli@arm.com,
	andrew.rybchenko@oktetlabs.ru, ferruh.yigit@intel.com,
	akhil.goyal@nxp.com, talshn@nvidia.com, dmitry.kozliuk@gmail.com,
	bluca@debian.org
Subject: Re: [dpdk-dev] [PATCH v2 0/3] Allow overriding of build-time constants
Date: Mon, 19 Oct 2020 23:04:54 +0200
Message-ID: <2056495.F7hjc4fSrx@thomas> (raw)
In-Reply-To: <20201019102112.GB649@bricha3-MOBL.ger.corp.intel.com>

19/10/2020 12:21, Bruce Richardson:
> On Fri, Oct 16, 2020 at 06:46:12PM +0200, David Marchand wrote:
> > On Fri, Oct 16, 2020 at 5:56 PM Bruce Richardson
> > <bruce.richardson@intel.com> wrote:
> > > > librte_eal.so is indeed built with the 64 value:
> > > > $ pahole -C rte_mem_config build/install/lib64/librte_eal.so |grep memsegs
> > > > die__process_function: tag not supported (INVALID)!
> > > >     struct rte_memseg_list     memsegs[64];          /*   136  8704 */
> > > >
> > > >
> > > > But no trace of the custom value for external applications:
> > > > $ grep -r RTE_MAX_MEMSEG_LISTS build/install
> > > > build/install/include/rte_config.h:#ifndef RTE_MAX_MEMSEG_LISTS
> > > > build/install/include/rte_config.h:#define RTE_MAX_MEMSEG_LISTS 128
> > > > Binary file build/install/lib64/librte_eal.a matches
> > > > Binary file build/install/lib64/librte_eal.so.21.0 matches
> > > >
> > > > I can see the same using the meson option -Dc_args.
> > >
> > > Good point, I had not thought of external apps using these values.
> > >
> > > They are mostly for internal use, so maybe its worthwhile looking to not
> > > have them in a public header file. What do you think? Is it likely that
> > > apps would be using some of these values, or needs to know the specifics?
> > 
> > Some are publicly exposed, like RTE_MEMPOOL_CACHE_MAX_SIZE,
> > RTE_PKTMBUF_HEADROOM, RTE_ETHDEV_RXTX_CALLBACKS,
> > For those, either we propagate the overriden value to the installed
> > rte_config.h or we refuse customisation.
> > 
> I'd suggest the first 2 of those should possibly be global meson options.

How the application is reading the meson options?

> Third should probably not be exposed at all.

I think everything should be exposed.
The application may need to know whether a feature is enabled or not,
and what is a specific tuning value.

I suspect it is the last blocker for meson adoption.
Now that we removed the makefiles, we need to fill this gap urgently.



  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-25 11:44 [dpdk-dev] [PATCH 1/2] config: remove explicit undefinition of unset values Bruce Richardson
2020-08-25 11:44 ` [dpdk-dev] [PATCH 2/2] config: allow overriding some build defaults Bruce Richardson
2020-09-01  5:17   ` Ma, LihongX
2020-09-01  6:07     ` Hemant Agrawal
2020-09-01  9:02       ` Bruce Richardson
2020-09-03 14:50       ` Bruce Richardson
2020-09-03 14:49 ` [dpdk-dev] [PATCH v2 0/3] Allow overriding of build-time constants Bruce Richardson
2020-09-03 14:49   ` [dpdk-dev] [PATCH v2 1/3] config: remove explicit undefinition of unset values Bruce Richardson
2020-09-03 14:49   ` [dpdk-dev] [PATCH v2 2/3] config: allow overriding some build defaults Bruce Richardson
2020-09-03 14:49   ` [dpdk-dev] [PATCH v2 3/3] doc: add notes on overriding extra config values Bruce Richardson
2020-09-03 15:43     ` Hemant Agrawal
2020-10-14 14:20   ` [dpdk-dev] [PATCH v2 0/3] Allow overriding of build-time constants Bruce Richardson
2020-10-15  8:55     ` Chen, BoX C
2020-10-15  9:20       ` Bruce Richardson
2020-10-16 15:47   ` David Marchand
2020-10-16 15:55     ` Bruce Richardson
2020-10-16 16:46       ` David Marchand
2020-10-19 10:21         ` Bruce Richardson
2020-10-19 21:04           ` Thomas Monjalon [this message]
2020-10-20  8:34             ` Bruce Richardson
2020-10-20 10:04               ` Thomas Monjalon
2020-10-20 10:15                 ` Bruce Richardson
2020-10-28 16:32   ` Bruce Richardson

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