From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <dev-bounces@dpdk.org> Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id C736EA00C5; Sun, 3 Jul 2022 09:56:34 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 65FAC40E50; Sun, 3 Jul 2022 09:56:34 +0200 (CEST) Received: from na01-obe.outbound.protection.outlook.com (mail-cusazon11020017.outbound.protection.outlook.com [52.101.61.17]) by mails.dpdk.org (Postfix) with ESMTP id 1720440685 for <dev@dpdk.org>; Sun, 3 Jul 2022 09:56:33 +0200 (CEST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Wv+mPsphLMXVQpg8w8hsB7S/qmvW+o3e2/OjtOkfbQhdLNxvzB6C5POA2DNrnIk5UU+cWErZ1JixGJu5JFYRgrnY2A+F7949rsVTV+k0Mx8AaE/GHR6r4yxrI37/pDfE7N8MHxmSVfpCSkWJTgWqKZ4zo5VXRzmewZ0DsQ02k7remVT3gkZwN1C2F6+HyHrhZHQ2ncUOsJwiXl+L4y0cIdgbNZvRrXzSPeJspjFjmL/8IJ+2Yw0azUmhm9xwIC5NrpC8/frA9U+lGwiZGajyRRznh1Jv256hexTTvFldXCm0HSTlsDVSQfTnI6Evc5LPlP6Cz3vfnhEm3c+J4DxyRA== ARC-Message-Signature: i=1; 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b=SFJb27KhVL0qGktSMQqZiwjBQ0qd4zWdeZhB4crGB86+6cQ58kJmqfFNCW44XWfUjQ/uhYh4NMdk/Q/srJdiJGgnbK0F7A3lHskrsnMhuITM8dKU1cEe4FWrSLY7+l/u/OnXvZgPSJNbg+wXC3oF8gHIXerdTuxjaIiIhMqCtkU= Received: from PH7PR21MB3263.namprd21.prod.outlook.com (2603:10b6:510:1db::16) by PH7PR21MB3167.namprd21.prod.outlook.com (2603:10b6:510:1d7::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5417.6; Sun, 3 Jul 2022 07:56:18 +0000 Received: from PH7PR21MB3263.namprd21.prod.outlook.com ([fe80::11a4:ce07:c6d8:c172]) by PH7PR21MB3263.namprd21.prod.outlook.com ([fe80::11a4:ce07:c6d8:c172%7]) with mapi id 15.20.5373.010; Sun, 3 Jul 2022 07:56:18 +0000 From: Long Li <longli@microsoft.com> To: Stephen Hemminger <stephen@networkplumber.org>, "longli@linuxonhyperv.com" <longli@linuxonhyperv.com> CC: Ferruh Yigit <ferruh.yigit@intel.com>, "dev@dpdk.org" <dev@dpdk.org>, Ajay Sharma <sharmaajay@microsoft.com>, Stephen Hemminger <sthemmin@microsoft.com> Subject: RE: [PATCH 01/17] net/mana: add basic driver, build environment and doc Thread-Topic: [PATCH 01/17] net/mana: add basic driver, build environment and doc Thread-Index: AQHYjSlgWjh8SeINWEaYsI8REt0hy61pujUAgAKNmSA= Date: Sun, 3 Jul 2022 07:56:18 +0000 Message-ID: <PH7PR21MB32633E0C874B43B85C15B5FDCEBF9@PH7PR21MB3263.namprd21.prod.outlook.com> References: <1656666167-26035-1-git-send-email-longli@linuxonhyperv.com> <1656666167-26035-2-git-send-email-longli@linuxonhyperv.com> <20220701094736.7d7589b5@hermes.local> In-Reply-To: <20220701094736.7d7589b5@hermes.local> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ActionId=124a7b2c-c6b7-47f7-957a-8dbd2161a17a; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PH7PR21MB3263.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: ad5cc6ab-1d86-4271-b4b1-08da5cc98316 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Jul 2022 07:56:18.3363 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: PTpImhRkp1jrbfiObV9G0j0dtoBcDmzeo3cyCLngUZwkocdg+0yzX+Ag0ZwdX3ytTmwiEoC1cCN+DrShRUYWMA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR21MB3167 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 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> Errors-To: dev-bounces@dpdk.org > Subject: Re: [PATCH 01/17] net/mana: add basic driver, build environment = and > doc >=20 > On Fri, 1 Jul 2022 02:02:31 -0700 > longli@linuxonhyperv.com wrote: >=20 > > + uint64_t max_mr_size; > > + rte_rwlock_t mr_list_lock; > > +}; >=20 > Reader/Writer locks are slower for the usual uncontended case. > Unless you have a reader holding onto the lock for a long time, better to= use > spin lock. >=20 > This is Linux wisdom (thank you paulmck), Windows seems to love reader/wr= iter > locks. This lock is used mostly uncontended for readers and allow them concurrentl= y to access the list. It's rare that a writer might want to access it. But changing it to spinlock will prevent multiple readers from accessing th= e list at the same time. In this use case, is it beneficial to use spinlock= s?