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Miller" , Jakub Kicinski , Heiner Kallweit , "jesse.brandeburg@intel.com" , "dchickles@marvell.com" , "tully@mikrotik.com" , "Eric Dumazet" , netdev , LKML Subject: RE: [PATCH net-next 2/4] atl1c: improve performance by avoiding unnecessary pcie writes on xmit Thread-Topic: [PATCH net-next 2/4] atl1c: improve performance by avoiding unnecessary pcie writes on xmit Thread-Index: AQHXRthGfxwa6Sp/UUaodlxqy8H9MarfgGkA Date: Wed, 12 May 2021 08:33:06 +0000 Message-ID: <2a1d219618eb4076ab32c141db698241@AcuMS.aculab.com> References: <20210511190518.8901-1-gatis@mikrotik.com> <20210511190518.8901-3-gatis@mikrotik.com> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogQ2hyaXMgU25vb2sgPGNocmlzLnNub29rQGdtYWlsLmNvbT4NCj4gU2VudDogMTIgTWF5 IDIwMjEgMDM6NDANCj4gDQo+IE9uIFR1ZSwgTWF5IDExLCAyMDIxIGF0IDEyOjA1IFBNIEdhdGlz IFBlaXNlbmlla3MgPGdhdGlzQG1pa3JvdGlrLmNvbT4gd3JvdGU6DQo+ID4NCj4gPiBUaGUga2Vy bmVsIGhhcyB4bWl0X21vcmUgZmFjaWxpdHkgdGhhdCBoaW50cyB0aGUgbmV0d29ya2luZyBkcml2 ZXIgeG1pdA0KPiA+IHBhdGggYWJvdXQgd2hldGhlciBtb3JlIHBhY2tldHMgYXJlIGNvbWluZyBz b29uLiBUaGlzIGluZm9ybWF0aW9uIGNhbiBiZQ0KPiA+IHVzZWQgdG8gYXZvaWQgdW5uZWNlc3Nh cnkgZXhwZW5zaXZlIFBDSWUgdHJhbnNhY3Rpb24gcGVyIHR4IHBhY2tldCBhdCBhDQo+ID4gc2xp Z2h0IGluY3JlYXNlIGluIGxhdGVuY3kuDQo+IA0KPiBJbmNyZWFzZXMgaW4gbGF0ZW5jeSB0ZW5k IHRvIGh1cnQgbW9yZSBvbiBzaW5nbGUtcXVldWUgZGV2aWNlcy4gSGFzDQo+IHRoaXMgYmVlbiB0 ZXN0ZWQgb24gdGhlIG9yaWdpbmFsIGdpZ2FiaXQgYXRsMWM/DQoNCkl0IHByb2JhYmx5IGRlcGVu ZHMgYSBsb3Qgb24gaG93IGV4cGVuc2l2ZSBpdCBpcyB0byAna2ljaycgdGhlIG1hYyB1bml0Lg0K DQpBIHNpbXBsZSAocG9zdGVkKSBQQ0llIHdyaXRlIHdoZW4gdGhlIFBDSWUgaG9zdCBpbnRlcmZh Y2UgaXMgaWRsZSAoYXMgaXMgbGlrZWx5DQp3aGVuIHlvdSd2ZSBqdXN0IGJlZW4gdXBkYXRpbmcg ZGVzY3JpcHRvcnMpIGlzIHByb2JhYmx5IG5vaXNlIGNvbXBhcmVkDQp0byB0aGUgcmVzdCBvZiB0 aGUgY29zdCBvZiBzZW5kaW5nIHRoZSBwYWNrZXQuDQooRXJpYyB3aWxsIHByb2JhYmx5IHNheSB0 aGV5IG1lYXN1cmVkIGdhaW5zLikNCg0KT1RPSCBpZiB5b3UgaGF2ZSAoYXMgSSBoYXZlIG9uIG9u ZSBzeXN0ZW0pIHRoZSBlMTAwMGUgZHJpdmVyIGFuZCBzb21lDQpjb21wbGV0ZWx5IGJyb2tlbiAn bWFuYWdlbWVudCBpbnRlcmZhY2UnIGhhcmR3YXJlIHdoaWNoIG1lYW5zIGl0IGNhbg0KdGFrZSBh IGxvdCBvZiBtaWNyb3NlY29uZHMgdG8gd3JpdGUgdG8gYW55IE1BQyByZWdpc3RlciB5b3UgcmVh bGx5DQpkbyBuZWVkIHRvIGxvb2sgYXQgbmV0ZGV2X3htaXRfbW9yZSgpIFsxXS4NCg0KVW5mb3J0 dW5hdGVseSBpdCBkb2Vzbid0IGhlbHAgdGhhdCBtdWNoLg0KbmV0ZGV2X3htaXRfbW9yZSgpIHJl cG9ydHMgdGhlIHN0YXRlIG9mIHRoZSB0eCBxdWV1ZSB3aGVuIHRoZSBjdXJyZW50DQpza2IgdHJh bnNtaXQgd2FzIHBhc3NlZCB0byB0aGUgbWFjIGRyaXZlci4NCkl0IGRvZXNuJ3QgcmVwb3J0IHRo ZSBzdGF0ZSBvZiB0aGUgcXVldWUgYXQgdGhlIHRpbWUgbmV0ZGV2X3htaXRfbW9yZSgpDQppcyBj YWxsZWQgLSBzbyBhbnkgcGFja2V0cyBxdWV1ZWQgd2hpbGUgdGhlIHRyYW5zbWl0IHNldHVwIGlz IGluDQpwcm9ncmVzcyBkb24ndCBjYXVzZSBuZXRkZXZfeG1pdF9tb3JlKCkgdG8gcmV0dXJuIHRy dWUuDQpJJ3ZlIHRyYWNlZCB0aGlzIGhhcHBlbmluZyByZXBlYXRlZGx5Li4uDQoNClsxXSBJZiB0 aGUgTUkgaXMgYWN0aXZlIE1BQyB3cml0ZXMgYXJlIGJyb2tlbiAobWF5IHdyaXRlIHRvIHRoZQ0K d3JvbmcgcmVnaXN0ZXIpLCBzbyB0aGVyZSBpcyBob3JyaWQgY29kZSBiZWZvcmUgZWFjaCBhY2Nl c3MgdGhhdA0KKElJUkMpIGVmZmVjdGl2ZWx5IGRvZXM6DQoJd2hpbGUgKG1pX2FjdGl2ZSgpKQ0K CQltZGVsYXkoMTApOw0KVGhpcyBpcyBqdXN0IHNvIGJyb2tlbiAoaW50ZXJydXB0cyBhcmUgZXZl biBlbmFibGVkKS4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwg QnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVn aXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==