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From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: Dharmik Thakkar <Dharmik.Thakkar@arm.com>
Cc: "Lu, Wenzhuo" <wenzhuo.lu@intel.com>,
	"Wu, Jingjing" <jingjing.wu@intel.com>,
	"Iremonger, Bernard" <bernard.iremonger@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>, nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH 2/5] app/testpmd: print fractional part in CPU	cycles
Date: Fri, 8 May 2020 17:17:41 +0000	[thread overview]
Message-ID: <BYAPR11MB3301D58AB732224533169F3D9AA20@BYAPR11MB3301.namprd11.prod.outlook.com> (raw)
In-Reply-To: <8B6C95A8-8126-4E17-8E39-31FF0A03BD7A@arm.com>

> Hi Konstantin,
> 
> > On May 7, 2020, at 4:50 AM, Ananyev, Konstantin <konstantin.ananyev@intel.com> wrote:
> >
> >
> >
> >> -----Original Message-----
> >> From: dev <dev-bounces@dpdk.org> On Behalf Of Dharmik Thakkar
> >> Sent: Wednesday, May 6, 2020 10:59 PM
> >> To: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>
> >> Cc: dev@dpdk.org; nd@arm.com; Dharmik Thakkar <dharmik.thakkar@arm.com>
> >> Subject: [dpdk-dev] [PATCH 2/5] app/testpmd: print fractional part in CPU cycles
> >>
> >> Change printing of CPU cycles/packet to include fractional part for
> >> accurateness.
> >>
> >> Example:
> >>
> >> Without patch:
> >> CPU cycles/packet=14
> >> (total cycles=4899533541 / total RX packets=343031966)
> >>
> >> With patch:
> >> CPU cycles/packet=14.28
> >> (total cycles=4899533541 / total RX packets=343031966)
> >>
> >> Signed-off-by: Dharmik Thakkar <dharmik.thakkar@arm.com>
> >> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> >> Reviewed-by: Phil Yang <phil.yang@arm.com>
> >> ---
> >> app/test-pmd/testpmd.c | 4 ++--
> >> 1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
> >> index 9a8cbbd6fc7c..9444a730a153 100644
> >> --- a/app/test-pmd/testpmd.c
> >> +++ b/app/test-pmd/testpmd.c
> >> @@ -1955,9 +1955,9 @@ fwd_stats_display(void)
> >> #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
> >> #define CYC_PER_MHZ 1E6
> >> 	if (total_recv > 0)
> >> -		printf("\n  CPU cycles/packet=%u (total cycles="
> >> +		printf("\n  CPU cycles/packet=%.2f (total cycles="
> >> 		       "%"PRIu64" / total RX packets=%"PRIu64") at %lu MHz Clock\n",
> >> -		       (unsigned int)(fwd_cycles / total_recv),
> >> +		       (double)(fwd_cycles / (double)total_recv),
> >
> > Probably safer long double - to avoid overflow.
> 
> Is it possible for a ‘double' to be less than 8 bytes?

That was my initial thought - that on some 32 bit systems it could be 4B.
Though it seems I was wrong, so feel free to ignore.
BTW, what for double conversion, why not just:
double)(fwd_cycles /total_recv
?



> 
> >
> >> 		       fwd_cycles, total_recv, (uint64_t)(rte_get_tsc_hz() / CYC_PER_MHZ));
> >> #endif
> >> }
> >> --
> >> 2.20.1


  reply	other threads:[~2020-05-08 17:17 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 [this message]
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
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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