From mboxrd@z Thu Jan 1 00:00:00 1970 From: "hzwulibin" Subject: [performance] why rbd_aio_write latency increase from 4ms to 7.3ms after the same test Date: Mon, 02 Nov 2015 13:24:10 +0800 Message-ID: <5636F376.3090104@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail-pa0-f67.google.com ([209.85.220.67]:34611 "EHLO mail-pa0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751059AbbKBFtK (ORCPT ); Mon, 2 Nov 2015 00:49:10 -0500 Received: by padda3 with SMTP id da3so15789170pad.1 for ; Sun, 01 Nov 2015 21:49:09 -0800 (PST) Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel , ceph-users SGksIA0Kc2FtZSBlbnZpcm9ubWVudCwgYWZ0ZXIgYSB0ZXN0IHNjcmlwdCwgdGhlIGlvIGxhdGVu Y3koZ2V0IGZyb20gc3VkbyBjZXBoIC0tYWRtaW4tZGFlbW9uIC9ydW4vY2VwaC9ndWVzdHMvY2Vw aC1jbGllbnQuKi5hc29rIHBlciBkdW1wKSANCmluY3JlYXNlIGZyb20gYWJvdXQgNG1zIHRvIDcu M21zDQoNCnFlbXUgdmVyc2lvbjogZGViaWFuIDIuMS4yDQprZXJuZWw6My4xMC40NS1vcGVuc3Rh Y2stYW1kNjQNCnN5c3RlbTogZGViaWFuIDcuOA0KY2VwaDogMC45NC41DQpWTSBDUFUgbnVtYmVy OiA0ICAoY3B1IE1IeiA6IDI1OTkuOTk4KQ0KVk0gbWVtb3J5IHNpemU6IDE2R0INCjkgT1NEIHN0 b3JhZ2Ugc2VydmVycywgd2l0aCA0IFNTRCBPU0Qgb24gZWFjaCwgdG90YWwgMzYgT1NEcy4NCg0K VGVzdCBzY3JpcHRzIGluIFZNOg0KIyBjYXQgcmVwcm9kdWNlLnNoDQojIS9iaW4vYmFzaA0KDQp0 aW1lcz0yMA0KZm9yKChpPTE7aTw9JHRpbWVzO2krKykpDQpkbw0KICAgIHRtcGRhdGU9YGRhdGUg IislRi0lVCJgDQogICAgZWNobyAiPT09PT09PT09PT09PT09PT09PT09PT0kdG1wZGF0ZSgkaS8k dGltZXMpPT09PT09PT09PT09PT09PT09PT09PT0iDQogICAgdG1wPSQoKGklMikpDQogICAgaWYg W1sgJHRtcCAtZXEgMCBdXTt0aGVuDQogICAgICAgIGVjaG8gIiMjIyMjIyMjIyMjIyMjIyBmaW8g L3Jvb3QvdmRiLmNmZyAjIyMjIyMjIyMjIyMjIyMiDQogICAgICAgIGZpbyAvcm9vdC92ZGIuY2Zn DQogICAgZWxzZQ0KICAgICAgICBlY2hvICIjIyMjIyMjIyMjIyMjIyMgZmlvIC9yb290L3ZkYy5j ZmcgIyMjIyMjIyMjIyMjIyMjIg0KICAgICAgICBmaW8gL3Jvb3QvdmRjLmNmZw0KICAgIGZpDQpk b25lDQoNCg0KdG1wZGF0ZT1gZGF0ZSAiKyVGLSVUImANCmVjaG8gIiMjIyMjIyMjIyMjIyMjIyBb JHRtcGRhdGVdIGZpbyAvcm9vdC92ZGUuY2ZnICMjIyMjIyMjIyMjIyMjIyINCmZpbyAvcm9vdC92 ZGUuY2ZnDQoNCg0KIyBjYXQgdmRiLmNmZyANCltnbG9iYWxdDQpydz1yYW5kd3JpdGUNCmRpcmVj dD0xDQpudW1qb2JzPTY0DQppb2VuZ2luZT1zeW5jDQpic3JhbmdlPTRrLTRrDQpydW50aW1lPTE4 MA0KZ3JvdXBfcmVwb3J0aW5nDQoNCltkaXNrMDFdDQpmaWxlbmFtZT0vZGV2L3ZkYg0KDQoNCiMg Y2F0IHZkYy5jZmcgDQpbZ2xvYmFsXQ0Kcnc9cmFuZHdyaXRlDQpkaXJlY3Q9MQ0KbnVtam9icz02 NA0KaW9lbmdpbmU9c3luYw0KYnNyYW5nZT00ay00aw0KcnVudGltZT0xODANCmdyb3VwX3JlcG9y dGluZw0KDQpbZGlzazAxXQ0KZmlsZW5hbWU9L2Rldi92ZGMNCg0KIyBjYXQgdmRkLmNmZyANCltn bG9iYWxdDQpydz1yYW5kd3JpdGUNCmRpcmVjdD0xDQpudW1qb2JzPTY0DQppb2VuZ2luZT1zeW5j DQpic3JhbmdlPTRrLTRrDQpydW50aW1lPTE4MA0KZ3JvdXBfcmVwb3J0aW5nDQoNCltkaXNrMDFd DQpmaWxlbmFtZT0vZGV2L3ZkZA0KDQojIGNhdCB2ZGUuY2ZnIA0KW2dsb2JhbF0NCnJ3PXJhbmR3 cml0ZQ0KZGlyZWN0PTENCm51bWpvYnM9NjQNCmlvZW5naW5lPXN5bmMNCmJzcmFuZ2U9NGstNGsN CnJ1bnRpbWU9MTgwDQpncm91cF9yZXBvcnRpbmcNCg0KW2Rpc2swMV0NCmZpbGVuYW1lPS9kZXYv dmRlIAkJDQoNCkFmdGVyIHJ1biB0aGUgc2NyaXB0cyByZXByb2R1Y2Uuc2gsIHRoZSBkaXNrcyBp biB0aGUgVk0ncyBJT1BTIGN1dGRvd24gZnJvbSAxMmsgdG8gNWssIHRoZSBsYXRlbmN5IGluY3Jl YXNlIGZyb20gNG1zIHRvIDcuM21zLg0KDQpydW4gc3RlcHM6DQoxLiBjcmVhdGUgYSBWTQ0KMi4g Y3JlYXRlIGZvdXIgdm9sdW1lcyBhbmQgYXR0YXRjaCB0byB0aGUgVk0NCjMuIHNoIHJlcHJvZHVj ZS5zaA0KNC4gaW4gdGhlIHJ1bnRpbWUgb2YgIHJlcHJvZHVjZS5zaCwgcnVuICJmaW8gdmRkLmNm ZyIgb3IgImZpbyB2ZGUuY2ZnIiB0byBjaGVja3QgdGhlIHBlcmZvcm1hbmNlDQoJDQpBZnRlciBy ZXByb2R1Y2Uuc2ggZmluaXNoZWQsIHBlcmZvcm1hbmNlIGRvd24uDQoNCg0KQW55b25lIGhhcyB0 aGUgc2FtZSBwcm9ibGVtIG9yIGhhcyBzb21lIGlkZWFzIGFib3V0IHRoaXM/DQoNClRoYW5rcyEN Ci0tLS0tLS0tLS0tLS0tDQpoend1bGliaW4NCjIwMTUtMTEtMDINCg==