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Wed, 5 Sep 2018 07:49:14 +0000 From: "Elo, Matias (Nokia - FI/Espoo)" <matias.elo@nokia.com> To: "Van Haaren, Harry" <harry.van.haaren@intel.com> CC: Jerin Jacob <jerin.jacob@caviumnetworks.com>, "dev@dpdk.org" <dev@dpdk.org> Thread-Topic: [dpdk-dev] eventdev: method for finding out unlink status Thread-Index: AQHUJ9Aa1/qQlBsMGkGIBi2aSKyqoKSnZV8AgAAXrwCAAALrgIAAAmqAgAAQZICAADKWAIAADY8AgAEpQgCAAAXaAIAAEBUAgAydLwCAAcbvAIAAEcaAgAGT74CAAAfgAIAAInSAgAALFYCAKDjkgA== Date: Wed, 5 Sep 2018 07:49:13 +0000 Message-ID: <285D18AA-EC23-4C04-824A-726F20681C61@nokia.com> References: <20180730142614.GA11265@jerin> <6D43DE84-583D-42E5-B298-0E7BDA0C17FB@nokia.com> <20180731083107.GA23233@jerin> <4C54AAAE-A872-47E1-B815-AF68965F9F3E@nokia.com> <FB101081-5D5A-4FEA-9352-048D47BA05A7@nokia.com> <E923DB57A917B54B9182A2E928D00FA65E2ADCA2@IRSMSX102.ger.corp.intel.com> <20180809141814.GA15603@jerin> <4C66F1B2-02F0-4F6E-A6CD-6A3F44CDAB42@nokia.com> <20180810145209.GA2475@jerin> <E923DB57A917B54B9182A2E928D00FA65E2B17A2@IRSMSX102.ger.corp.intel.com> <20180810173510.GA6835@jerin> In-Reply-To: <20180810173510.GA6835@jerin> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3445.9.1) x-originating-ip: [131.228.32.181] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; 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charset="us-ascii" Content-ID: <83921600B182E04DB24C1E40F9054D2E@eurprd07.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 04d982c6-dc8c-4f78-8fe6-08d613041331 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Sep 2018 07:49:14.0128 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR07MB3369 Subject: Re: [dpdk-dev] eventdev: method for finding out unlink status X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> X-List-Received-Date: Wed, 05 Sep 2018 07:49:16 -0000 >>=20 >> I'm not sure I understand the issue here. >> Is anybody suggesting to make unlink() blocking? >>=20 >> For certain PMDs, perhaps it must be a synchronous handled unlink(). >> For other PMDs (eg event/sw) there are multiple threads involved, >> so it must be async. Hence, APIs should be async to avoid blocking the c= aller. >>=20 >> With an async API, if you don't want the async behaviuor, it is >> easy to build the sync version: call it in a loop, optionally with a del= ay(). >=20 > Correct. My point was, rte_event_port_unlink() can be blocking as it=20 > is a slow path API(does not really matter how long it waits). > If you think, it can be called in fastpath and/or application can > leverage some cpu cycles on completing the async call then you can add > at the cost of new API unlinks_in_progress() and make sure to update the = documentation > about unlink() that it can be async call(currently it is documented as a = sync > call). Did you come to an agreement how to solve this issue? Any solution (e.g. ma= ke rte_event_port_unlink() blocking with SW eventdev) would be welcomed since = this issue is currently blocking my work with eventdev.