From: Bruce Richardson <bruce.richardson@intel.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: Dharmik Thakkar <dharmik.thakkar@arm.com>,
dev@dpdk.org, nd@arm.com, Ed Czeck <ed.czeck@atomicrules.com>,
Jerin Jacob Kollanukkaran <jerinj@marvell.com>
Subject: Re: [dpdk-dev] [PATCH 0/6] app/testpmd: add runtime config
Date: Wed, 26 Aug 2020 17:41:23 +0100 [thread overview]
Message-ID: <20200826164123.GC564@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <3092c394-29e2-df76-6b99-01022875cde6@intel.com>
On Wed, Aug 26, 2020 at 05:33:20PM +0100, Ferruh Yigit wrote:
> On 7/14/2020 10:51 PM, Dharmik Thakkar wrote:
> > Meson build system lacks support for
> > CONFIG_RTE_TEST_PMD_RECORD_CORE_CYCLES and
> > CONFIG_RTE_TEST_PMD_RECORD_BURST_STATS configuration options.
> >
> > One solution is to add these options within meson_options.txt
> >
> > Since adding these as runtime config causes no performance impact,
>
> Hi Dharmik,
>
> These are on the datapath, and even disable there will be additional
> checks, isn't it expected to have some impact? Did you do any
> measurements for it?
>
Branches that always predict the same way can be very cheap, and unless
proven to be a problem, I'd see no issue with having a few on the datapath
- especially if it just one or two per burst. If we start seeing a
significant number, or ones that occur for every packet, then we perhaps
need to be more cautious.
I also think that using lots of different CFLAGS for turning things on and
off is as bad - or even worse - than using the old build-time config
options, just this time we don't have a single list of them somewhere!
Therefore, I think we really need to start converting these to runtime
options where we can.
Regards,
/Bruce
next prev parent reply other threads:[~2020-08-26 16:41 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200506215939eucas1p1fd98a671dda83adf884c30d7bf9b77c4@eucas1p1.samsung.com>
2020-05-06 21:58 ` [dpdk-dev] [PATCH 1/5] app/testpmd: print clock with CPU cycles per pkt Dharmik Thakkar
2020-05-06 21:58 ` [dpdk-dev] [PATCH 2/5] app/testpmd: print fractional part in CPU cycles Dharmik Thakkar
2020-05-07 9:50 ` Ananyev, Konstantin
2020-05-07 22:16 ` Dharmik Thakkar
2020-05-08 17:17 ` Ananyev, Konstantin
2020-05-08 17:36 ` Dharmik Thakkar
2020-05-08 18:08 ` Ananyev, Konstantin
2020-05-06 21:58 ` [dpdk-dev] [PATCH 3/5] doc: add cycles per packet in testpmd user guide Dharmik Thakkar
2020-05-07 5:24 ` Jerin Jacob
2020-05-07 22:27 ` Dharmik Thakkar
2020-05-07 14:30 ` Iremonger, Bernard
2020-05-06 21:58 ` [dpdk-dev] [PATCH 4/5] doc: include config options " Dharmik Thakkar
2020-05-07 14:42 ` Iremonger, Bernard
2020-05-06 21:58 ` [dpdk-dev] [PATCH 5/5] doc: add aarch64 generic counter section Dharmik Thakkar
2020-05-07 5:17 ` Jerin Jacob
2020-05-06 22:48 ` [dpdk-dev] [PATCH 1/5] app/testpmd: print clock with CPU cycles per pkt Lukasz Wojciechowski
2020-05-07 13:38 ` Iremonger, Bernard
2020-05-08 22:38 ` [dpdk-dev] [PATCH v2 " Dharmik Thakkar
2020-05-08 22:38 ` [dpdk-dev] [PATCH v2 2/5] app/testpmd: print fractional part in CPU cycles Dharmik Thakkar
2020-05-12 10:19 ` Iremonger, Bernard
2020-05-08 22:38 ` [dpdk-dev] [PATCH v2 3/5] doc: add cycles per packet in testpmd user guide Dharmik Thakkar
2020-05-12 10:20 ` Iremonger, Bernard
2020-05-15 12:15 ` Ferruh Yigit
2020-05-15 20:33 ` Dharmik Thakkar
2020-05-18 9:47 ` Ferruh Yigit
2020-05-18 21:49 ` Dharmik Thakkar
2020-05-19 8:27 ` Ferruh Yigit
2020-05-20 3:20 ` [dpdk-dev] [PATCH v3 1/2] " Dharmik Thakkar
2020-05-20 3:20 ` [dpdk-dev] [PATCH v3 2/2] doc: include config options " Dharmik Thakkar
2020-06-17 18:21 ` Ferruh Yigit
2020-06-17 19:48 ` Thomas Monjalon
2020-06-19 15:38 ` Dharmik Thakkar
2020-06-19 15:43 ` Thomas Monjalon
2020-06-19 16:13 ` Dharmik Thakkar
2020-06-22 15:26 ` Thomas Monjalon
2020-06-29 14:25 ` Dharmik Thakkar
2020-07-14 21:51 ` [dpdk-dev] [PATCH 0/6] app/testpmd: add runtime config Dharmik Thakkar
2020-07-14 21:51 ` [dpdk-dev] [PATCH 1/6] app/testpmd: add record-core-cycles " Dharmik Thakkar
2020-07-14 21:51 ` [dpdk-dev] [PATCH 2/6] doc: add record-core-cycles to testpmd funcs doc Dharmik Thakkar
2020-07-14 21:51 ` [dpdk-dev] [PATCH 3/6] app/testpmd: add record-burst-stats runtime config Dharmik Thakkar
2020-07-14 21:51 ` [dpdk-dev] [PATCH 4/6] doc: add record-burst-stats to testpmd funcs doc Dharmik Thakkar
2020-07-14 21:51 ` [dpdk-dev] [PATCH 5/6] app/testpmd: enable burst stats for noisy vnf mode Dharmik Thakkar
2020-07-14 21:51 ` [dpdk-dev] [PATCH 6/6] app/testpmd: enable empty polls in 5tswap Dharmik Thakkar
2020-07-15 4:29 ` Phil Yang
2020-08-26 16:33 ` [dpdk-dev] [PATCH 0/6] app/testpmd: add runtime config Ferruh Yigit
2020-08-26 16:41 ` Bruce Richardson [this message]
2020-08-26 17:07 ` Dharmik Thakkar
2020-08-26 22:06 ` Ferruh Yigit
2020-09-10 15:06 ` Ferruh Yigit
2020-08-26 21:24 ` Ferruh Yigit
2020-05-20 14:49 ` [dpdk-dev] [PATCH v3 1/2] doc: add cycles per packet in testpmd user guide Ferruh Yigit
2020-05-21 17:41 ` Ferruh Yigit
2020-05-08 22:38 ` [dpdk-dev] [PATCH v2 4/5] doc: include config options " Dharmik Thakkar
2020-05-12 10:20 ` Iremonger, Bernard
2020-05-19 7:42 ` Thomas Monjalon
2020-05-19 22:58 ` Dharmik Thakkar
2020-05-20 7:53 ` Thomas Monjalon
2020-05-20 22:39 ` Dharmik Thakkar
2020-05-19 7:45 ` Thomas Monjalon
2020-05-08 22:38 ` [dpdk-dev] [PATCH v2 5/5] doc: add aarch64 generic counter section Dharmik Thakkar
2020-05-12 10:18 ` [dpdk-dev] [PATCH v2 1/5] app/testpmd: print clock with CPU cycles per pkt Iremonger, Bernard
2020-05-15 12:23 ` Ferruh Yigit
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