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Sat, 9 Dec 2017 09:27:05 +0000 Date: Sat, 9 Dec 2017 14:56:44 +0530 From: Jerin Jacob <jerin.jacob@caviumnetworks.com> To: "Van Haaren, Harry" <harry.van.haaren@intel.com> Cc: "Eads, Gage" <gage.eads@intel.com>, "dev@dpdk.org" <dev@dpdk.org>, "Richardson, Bruce" <bruce.richardson@intel.com>, "hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>, "nipun.gupta@nxp.com" <nipun.gupta@nxp.com>, "santosh.shukla@caviumnetworks.com" <santosh.shukla@caviumnetworks.com>, "pbhagavatula@caviumnetworks.com" <pbhagavatula@caviumnetworks.com> Message-ID: <20171209092643.GB13525@jerin> References: <1512011314-19682-1-git-send-email-gage.eads@intel.com> <1512011314-19682-2-git-send-email-gage.eads@intel.com> <E923DB57A917B54B9182A2E928D00FA650FDEC43@IRSMSX102.ger.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <E923DB57A917B54B9182A2E928D00FA650FDEC43@IRSMSX102.ger.corp.intel.com> User-Agent: Mutt/1.9.1 (2017-09-22) X-Originating-IP: [171.76.104.209] X-ClientProxiedBy: BMXPR01CA0014.INDPRD01.PROD.OUTLOOK.COM (10.174.214.152) To SN2PR07MB2526.namprd07.prod.outlook.com (10.167.14.154) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 3f8f6bb6-f4cf-47a8-72eb-08d53ee70504 X-Microsoft-Antispam: UriScan:; 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Van Haaren, Harry > > <harry.van.haaren@intel.com>; Richardson, Bruce > > <bruce.richardson@intel.com>; hemant.agrawal@nxp.com; nipun.gupta@nxp.com; > > santosh.shukla@caviumnetworks.com; pbhagavatula@caviumnetworks.com > > Subject: [PATCH 2/2] event/sw: use dynamically-sized IQs > > > > This commit introduces dynamically-sized IQs, by switching the underlying > > data structure from a fixed-size ring to a linked list of queue 'chunks.' > > This has a number of benefits: > > - Certain corner cases were observed in which all of a pipeline's flows > > could be pinned to one port for extended periods, effectively turning a > > multi-core pipeline into single-core one. This was caused by an event > > producer having a larger new_event_threshold than the IQ depth, and > > injecting large numbers of packets that are ultimately backpressured in a > > worker's rx_ring, causing those packets' flows to be scheduled to that > > port. > > The dynamically sized IQ does not have this problem because each IQ can > > grow large enough to store all the system's events, such that > > backpressure will not reach the worker_ring. > > - Slight performance improvement (~1-2%) in high throughput scenarios, > > tested with eventdev_pipeline_sw_pmd. > > > > This implementation has a small increase in the queue storage memory > > footprint (~70KB). This commit also removes the iq_size xstat, which no > > longer applies to this implementation. > > > > Signed-off-by: Gage Eads <gage.eads@intel.com> > > Some review notes below - but nothing that needs changing. > > Acked-by: Harry van Haaren <harry.van.haaren@intel.com> > Applied to dpdk-next-eventdev/master. Thanks. >