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Fri, 16 Aug 2024 05:25:25 +0000 From: Rakesh Kudurumalla To: Stephen Hemminger CC: "ferruh.yigit@amd.com" , "andrew.rybchenko@oktetlabs.ru" , "orika@nvidia.com" , "thomas@monjalon.net" , "dev@dpdk.org" , Jerin Jacob , Nithin Kumar Dabilpuram , "stable@dpdk.org" Subject: RE: [EXTERNAL] Re: [PATCH v5 1/1] examples/l2fwd-jobstats: fix lock availability Thread-Topic: [EXTERNAL] Re: [PATCH v5 1/1] examples/l2fwd-jobstats: fix lock availability Thread-Index: AQHa7AeKprgkBtY9/ke7CCtlF8mKCbIiO9GAgAclClA= Date: Fri, 16 Aug 2024 05:25:24 +0000 Message-ID: References: <20240811065819.575759-1-rkudurumalla@marvell.com> <20240811155957.576645-1-rkudurumalla@marvell.com> <20240811091719.37512e55@hermes.local> In-Reply-To: <20240811091719.37512e55@hermes.local> 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_|DS0PR18MB5269:EE_ x-ms-office365-filtering-correlation-id: 5fe0d1df-d5f6-4eab-20b1-08dcbdb3d485 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 X-Proofpoint-GUID: aR30f2FlnOKm2LSpf2u8CUAKDLZHZFm0 X-Proofpoint-ORIG-GUID: aR30f2FlnOKm2LSpf2u8CUAKDLZHZFm0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-15_18,2024-08-15_01,2024-05-17_01 X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org > -----Original Message----- > From: Stephen Hemminger > Sent: Sunday, August 11, 2024 9:47 PM > To: Rakesh Kudurumalla > Cc: ferruh.yigit@amd.com; andrew.rybchenko@oktetlabs.ru; > orika@nvidia.com; thomas@monjalon.net; dev@dpdk.org; Jerin Jacob > ; Nithin Kumar Dabilpuram > ; stable@dpdk.org > Subject: [EXTERNAL] Re: [PATCH v5 1/1] examples/l2fwd-jobstats: fix lock > availability >=20 > On Sun, 11 Aug 2024 21:=E2=80=8A29:=E2=80=8A57 +0530 Rakesh Kudurumalla > wrote: > Race condition betw= een jobstats > and time metrics > for forwarding and flushing is maintained using spinlo= ck. > > Timer metrics are not displayed=20 > On Sun, 11 Aug 2024 21:29:57 +0530 > Rakesh Kudurumalla wrote: >=20 > > Race condition between jobstats and time metrics for forwarding and > > flushing is maintained using spinlock. > > Timer metrics are not displayed properly due to the frequent > > unavailability of the lock.This patch fixes the issue by introducing a > > delay before acquiring the lock in the loop. This delay allows for > > betteravailability of the lock, ensuring that show_lcore_stats() can > > periodically update the statistics even when forwarding jobs are > > running. > > > > Fixes: 204896f8d66c ("examples/l2fwd-jobstats: add new example") > > Cc: stable@dpdk.org > > > > Signed-off-by: Rakesh Kudurumalla >=20 > Would be better if this code used RCU and not a lock Currently the jobstats app uses the lock only for collecting single snapsho= t of different statistics and printing the same from main core. With RCU si= nce we cannot pause the worker core to collect such a single snapshot, inte= grating RCU would need a full redesign of the application and would take lo= t of effort.