From: Rakesh Kudurumalla <rkudurumalla@marvell.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: "ferruh.yigit@amd.com" <ferruh.yigit@amd.com>,
"andrew.rybchenko@oktetlabs.ru" <andrew.rybchenko@oktetlabs.ru>,
"orika@nvidia.com" <orika@nvidia.com>,
"thomas@monjalon.net" <thomas@monjalon.net>,
"dev@dpdk.org" <dev@dpdk.org>, Jerin Jacob <jerinj@marvell.com>,
Nithin Kumar Dabilpuram <ndabilpuram@marvell.com>,
"stable@dpdk.org" <stable@dpdk.org>
Subject: RE: [EXTERNAL] Re: [PATCH v5 1/1] examples/l2fwd-jobstats: fix lock availability
Date: Fri, 16 Aug 2024 05:25:24 +0000 [thread overview]
Message-ID: <DM4PR18MB4255ED099439DB092A159E77CF812@DM4PR18MB4255.namprd18.prod.outlook.com> (raw)
In-Reply-To: <20240811091719.37512e55@hermes.local>
> -----Original Message-----
> From: Stephen Hemminger <stephen@networkplumber.org>
> Sent: Sunday, August 11, 2024 9:47 PM
> To: Rakesh Kudurumalla <rkudurumalla@marvell.com>
> Cc: ferruh.yigit@amd.com; andrew.rybchenko@oktetlabs.ru;
> orika@nvidia.com; thomas@monjalon.net; dev@dpdk.org; Jerin Jacob
> <jerinj@marvell.com>; Nithin Kumar Dabilpuram
> <ndabilpuram@marvell.com>; stable@dpdk.org
> Subject: [EXTERNAL] Re: [PATCH v5 1/1] examples/l2fwd-jobstats: fix lock
> availability
>
> On Sun, 11 Aug 2024 21: 29: 57 +0530 Rakesh Kudurumalla
> <rkudurumalla@ marvell. com> wrote: > Race condition between jobstats
> and time 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 <rkudurumalla@marvell.com> 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 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 <rkudurumalla@marvell.com>
>
> Would be better if this code used RCU and not a lock
Currently the jobstats app uses the lock only for collecting single snapshot of different statistics and printing the same from main core. With RCU since we cannot pause the worker core to collect such a single snapshot, integrating RCU would need a full redesign of the application and would take lot of effort.
next prev parent reply other threads:[~2024-08-16 5:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-26 5:37 [PATCH 1/1] examples/l2fwd-jobstats: add delay to show stats Rakesh Kudurumalla
2024-07-29 6:10 ` [PATCH v2 " Rakesh Kudurumalla
2024-07-30 10:03 ` [PATCH v3 1/1] examples/l2fwd-jobstats: fix lock availability Rakesh Kudurumalla
2024-07-30 16:12 ` Thomas Monjalon
2024-08-08 11:41 ` [EXTERNAL] " Rakesh Kudurumalla
2024-08-08 12:22 ` Thomas Monjalon
2024-08-11 16:00 ` Rakesh Kudurumalla
2024-08-11 6:58 ` [PATCH v4 " Rakesh Kudurumalla
2024-08-11 15:59 ` [PATCH v5 " Rakesh Kudurumalla
2024-08-11 16:17 ` Stephen Hemminger
2024-08-16 5:25 ` Rakesh Kudurumalla [this message]
2024-10-21 7:13 ` [EXTERNAL] " Rakesh Kudurumalla
2024-11-04 10:17 ` Nithin Dabilpuram
2024-07-29 6:20 ` [PATCH v2 1/1] examples/l2fwd-jobstats: add delay to show stats Rakesh Kudurumalla
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