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Mon, 04 Nov 2024 02:17:13 -0800 (PST) MIME-Version: 1.0 References: <20240811065819.575759-1-rkudurumalla@marvell.com> <20240811155957.576645-1-rkudurumalla@marvell.com> <20240811091719.37512e55@hermes.local> In-Reply-To: From: Nithin Dabilpuram Date: Mon, 4 Nov 2024 15:47:00 +0530 Message-ID: Subject: Re: [EXTERNAL] Re: [PATCH v5 1/1] examples/l2fwd-jobstats: fix lock availability To: Rakesh Kudurumalla Cc: Stephen Hemminger , "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" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 Acked-by: Nithin Dabilpuram On Mon, Oct 21, 2024 at 12:43=E2=80=AFPM Rakesh Kudurumalla wrote: > > ping > > > -----Original Message----- > > From: Rakesh Kudurumalla > > Sent: Friday, August 16, 2024 10:55 AM > > 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 > > > > > > > > > -----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 > > > > > > On Sun, 11 Aug 2024 21:=E2=80=8A29:=E2=80=8A57 +0530 Rakesh Kudurumal= la > > > > marvell.=E2=80=8Acom> wrote: > Race condition between jobstats and ti= me > > > metrics > for forwarding and flushing is maintained using spinlock. > > > > Timer metrics are not displayed > > > On Sun, 11 Aug 2024 21:29:57 +0530 > > > Rakesh Kudurumalla wrote: > > > > > > > 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 introducin= g > > > > a delay before acquiring the lock in the loop. This delay allows fo= r > > > > betteravailability of the lock, ensuring that show_lcore_stats() ca= n > > > > 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 > > > > > > Would be better if this code used RCU and not a lock > > > > Currently the jobstats app uses the lock only for collecting single sna= pshot of > > different statistics and printing the same from main core. With RCU sin= ce we > > cannot pause the worker core to collect such a single snapshot, integra= ting > > RCU would need a full redesign of the application and would take lot of > > effort.