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Thu, 8 Aug 2024 11:41:38 +0000 From: Rakesh Kudurumalla To: Thomas Monjalon CC: "ferruh.yigit@amd.com" , "andrew.rybchenko@oktetlabs.ru" , "orika@nvidia.com" , "dev@dpdk.org" , Jerin Jacob , Nithin Kumar Dabilpuram , "stable@dpdk.org" Subject: RE: [EXTERNAL] Re: [PATCH v3 1/1] examples/l2fwd-jobstats: fix lock availability Thread-Topic: [EXTERNAL] Re: [PATCH v3 1/1] examples/l2fwd-jobstats: fix lock availability Thread-Index: AQHa4mfE8KjoH2CUikuMCBo4ubmnxLIPcbIAgA3VwIA= Date: Thu, 8 Aug 2024 11:41:38 +0000 Message-ID: References: <20240729061026.3729690-1-rkudurumalla@marvell.com> <20240730100335.3734796-1-rkudurumalla@marvell.com> <2648204.9Mp67QZiUf@thomas> In-Reply-To: <2648204.9Mp67QZiUf@thomas> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: DM4PR18MB4255:EE_|LV3PR18MB5566:EE_ x-ms-office365-filtering-correlation-id: c29ce43c-1c95-4112-2b22-08dcb79f107c x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Thomas Monjalon Sent: Tuesday, July 30, 2024 9:42 PM To: Rakesh Kudurumalla Cc: ferruh.yigit@amd.com; andrew.rybchenko@oktetlabs.ru; orika@nvidia.com; = dev@dpdk.org; Jerin Jacob ; Nithin Kumar Dabilpuram ; stable@dpdk.org Subject: [EXTERNAL] Re: [PATCH v3 1/1] examples/l2fwd-jobstats: fix lock av= ailability Hello, 30/07/2024 12:=E2=80=8A03, Rakesh Kudurumalla: > This patch addresse= s the issue by introducing a delay Please start with describing the issue. = > before acquiring the lock in the loop. This delay allows for better > ava= ilability of the Hello, 30/07/2024 12:03, Rakesh Kudurumalla: > This patch addresses the issue by introducing a delay Please start with describing the issue. > before acquiring the lock in the loop. This delay allows for better > availability of the lock, ensuring that show_lcore_stats() can > periodically update the statistics even when forwarding jobs are running. Why a delay is better than a pause? due to high frequency of polling in l2fwd_main_loop() rte_pause() is not y= ieding the processor to display stats relating to fwd and flush execution time so added a delay = achieve the same. > @@ -542,7 +542,7 @@ l2fwd_main_loop(void) > } while (likely(stats_read_pending =3D=3D 0)); > > rte_spinlock_unlock(&qconf->lock); > - rte_pause(); > + rte_delay_us(10); > } --_000_DM4PR18MB4255270C0335707BD060E143CFB92DM4PR18MB4255namp_ Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

 

 

From:= Thomas Monjalon <thomas@monjalon.net&g= t;
Sent: Tuesday, July 30, 2024 9:42 PM
To: Rakesh Kudurumalla <rkudurumalla@marvell.com>
Cc: ferruh.yigit@amd.com; andrew.rybchenko@oktetlabs.ru; orika@nvidi= a.com; dev@dpdk.org; Jerin Jacob <jerinj@marvell.com>; Nithin Kumar D= abilpuram <ndabilpuram@marvell.com>; stable@dpdk.org
Subject: [EXTERNAL] Re: [PATCH v3 1/1] examples/l2fwd-jobstats: fix = lock availability

 

Hello, 30/07/2024 12:=E2=80=8A03, Rakesh Kuduru= malla: > This patch addresses the issue by introducing a delay Please st= art with describing the issue. > before acquiring the lock in the loop. This delay allows for better > availability of th= e

Hello,
 
30/07/2024 12:03, Rakesh Kudurumalla:
> This patch addresses the issue by introducing a delay
 
Please start with describing the issue.
 
> before acquiring the lock in the loop. This delay allows for bette=
r
> availability of the lock, ensuring that show_lcore_stats() can
> periodically update the statistics even when forwarding jobs are r=
unning.
 
Why a delay is better than a pause?
 
due to high frequency of polling in l2fwd_main_loop()  rte_pause=
() is not yieding the processor 
to display stats relating to fwd and flush execution time so added a =
delay achieve the same.
 
> @@ -542,7 +542,7 @@ l2fwd_main_loop(void)
>            =
            &nb=
sp;  } while (likely(stats_read_pending =3D=3D 0));<=
/pre>

>  


>            =
            &nb=
sp;  rte_spinlock_unlock(&qconf->lock);


> -           =
;             r=
te_pause();


> +           =
;            rte_del=
ay_us(10);


>           }


 


 


 
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