From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56087C001DF for ; Sat, 21 Oct 2023 00:19:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233041AbjJUATr (ORCPT ); Fri, 20 Oct 2023 20:19:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231875AbjJUATp (ORCPT ); Fri, 20 Oct 2023 20:19:45 -0400 Received: from m1311.mail.163.com (m1311.mail.163.com [220.181.13.11]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7BF76D6B for ; Fri, 20 Oct 2023 17:19:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=Date:From:Subject:Content-Type:MIME-Version: Message-ID; bh=bi2/jAtBO/R7DPkVzRfhSgvjTTTHe65pMfy/zIfTavA=; b=F Bx0co3a/BciTQg855NfD0AWyBLABcqj5buhD332uaXpbBTwAQLptmt5OVeCKjVPV QxRD7RT1Th1LVCld7dEerHq1/F3jkZ8jX9bWWPAxCCatuwAgNab2A08mDcdqMCFN kPZOdLNVTMvmTDJ+58VbzNWaaUOPjgDU+SOckbqLgE= Received: from 00107082$163.com ( [111.35.185.232] ) by ajax-webmail-wmsvr11 (Coremail) ; Sat, 21 Oct 2023 08:19:34 +0800 (CST) X-Originating-IP: [111.35.185.232] Date: Sat, 21 Oct 2023 08:19:34 +0800 (CST) From: "David Wang" <00107082@163.com> To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PERFORMANCE]fs: sendfile suffer performance degradation when buffer size have performance impact on underling IO X-Priority: 3 X-Mailer: Coremail Webmail Server Version XT5.0.14 build 20230109(dcb5de15) Copyright (c) 2002-2023 www.mailtech.cn 163com X-NTES-SC: AL_QuySBfSfuE0s4iaYY+kXn0oTju85XMCzuv8j3YJeN500vinW3h4PbG9dHUPX7NOPCSKsoAi7eh9H7vpVcrhYdKYFLfxkO5652uZSTRLRuMUN Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=GBK MIME-Version: 1.0 Message-ID: <28de01eb.208.18b4f9a0051.Coremail.00107082@163.com> X-Coremail-Locale: zh_CN X-CM-TRANSID: C8GowAA3R1MXGTNle+YPAA--.41289W X-CM-SenderInfo: qqqrilqqysqiywtou0bp/1tbiEA8Qql8YL38cvgAEsU X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org SGksIAoKSSB3YXMgdHJ5aW5nIHRvIGNvbmZpcm0gdGhlIHBlcmZvcm1hbmNlIGltcHJvdmVtZW50 IHZpYSByZXBsYWNpbmcgcmVhZC93cml0ZSBzZXF1ZW5jZXMgd2l0aCBzZW5kZmlsZSwgCkJ1dCBJ IGdvdCBxdWl0ZSBhIHN1cnByaXNpbmcgcmVzdWx0OgoKJCBnY2MgLURVU0VfU0VOREZJTEUgY3Au Y3BwCiQgdGltZSAuL2Eub3V0IAoKcmVhbAkwbTU2LjEyMXMKdXNlcgkwbTAuMDAwcwpzeXMJMG00 Ljg0NHMKCiQgZ2NjICBjcC5jcHAKJCB0aW1lIC4vYS5vdXQgCgpyZWFsCTBtMjcuMzYzcwp1c2Vy CTBtMC4wMTRzCnN5cwkwbTQuNDQzcwoKVGhlIHJlc3VsdCBzaG93IHRoYXQsIGluIG15IHRlc3Qg c2NlbmFyaW8sICB0aGUgcmVhZC93cml0ZSBzZXF1ZW5jZXMgb25seSB1c2UgaGFsZiBvZiB0aGUg dGltZSBieSBzZW5kZmlsZS4KTXkgZ3Vlc3MgaXMgdGhhdCBzZW5kZmlsZSB1c2luZyBhIGRlZmF1 bHQgcGlwZSB3aXRoIGJ1ZmZlciBzaXplIDE8PDE2ICgxNiBwYWdlcyksIHdoaWNoIGlzIG5vdCB0 dW5lZCBmb3IgdGhlIHVuZGVybGluZyBJTywgCmhlbmNlIGEgcmVhZC93cml0ZSBzZXF1ZW5jZXMg d2l0aCBidWZmZXIgc2l6ZSAxPDwxNyBpcyBtdWNoIGZhc3RlciB0aGFuIHNlbmRmaWxlLgoKQnV0 IHRoZSBwcm9ibGVtIHdpdGggc2VuZGZpbGUgaXMgdGhhdCB0aGVyZSBpcyBubyBwYXJhbWV0ZXIg dG8gdHVuZSB0aGUgYnVmZmVyIHNpemUgZnJvbSB1c2Vyc3BhY2UuLi5BbnkgY2hhbmNlIHRvIGZp eCB0aGlzPwoKVGhlIHRlc3QgY29kZSBpcyBhcyBmb2xsb3dpbmc6CgojaW5jbHVkZSA8c3RkaW8u aD4KI2luY2x1ZGUgPHVuaXN0ZC5oPgojaW5jbHVkZSA8c3lzL3R5cGVzLmg+CiNpbmNsdWRlIDxz eXMvc3RhdC5oPgojaW5jbHVkZSA8c3lzL3NlbmRmaWxlLmg+CiNpbmNsdWRlIDxmY250bC5oPgoK Y2hhciBidWZbMTw8MTddOyAgIC8vIG11Y2ggYmV0dGVyIHRoYW4gMTw8MTYKaW50IG1haW4oKSB7 CglpbnQgaSwgZmluLCBmb3V0LCBuLCBtOwoJZm9yIChpPTA7IGk8MTI4OyBpKyspIHsKCQkvLyBk ZCBpZj0vZGV2L3VyYW5kb20gb2Y9Li9iaWdmaWxlIGJzPTEzMTA3MiBjb3VudD0yNTYKCQlmaW4g ID0gb3BlbigiLi9iaWdmaWxlIiwgT19SRE9OTFkpOwoJCWZvdXQgPSBvcGVuKCIuL3RhcmdldCIs IE9fV1JPTkxZIHwgT19DUkVBVCB8IE9fRFNZTkMsIFNfSVdVU1IpOwojaWZuZGVmIFVTRV9TRU5E RklMRSAKCQl3aGlsZSgxKSB7CgkJCW4gPSByZWFkKGZpbiwgYnVmLCBzaXplb2YoYnVmKSk7CgkJ CWlmIChuPT0wKSBicmVhazsKCQkJbSA9IHdyaXRlKGZvdXQsIGJ1Ziwgbik7CgkJCWlmIChuICE9 IG0pIHsKCQkJCXByaW50ZigiZmFpbCB0byB3cml0ZSwgZXhwZWN0ICVkLCBhY3R1YWwgJWRcbiIs IG4sIG0pOwoJCQkJcGVycm9yKCI6Iik7CgkJCQlyZXR1cm4gMTsKCQkJfQoJCX0KI2Vsc2UKCQlv ZmZfdCBvZmZzZXQgPSAwOwoJCXN0cnVjdCBzdGF0IHN0OwoJCWlmIChmc3RhdChmaW4sICZzdCkg IT0gMCkgewoJCQlwZXJyb3IoImZhaWwgdG8gZnN0YXRcbiIpOwoJCQlyZXR1cm4gMTsKCQl9CgkJ c2VuZGZpbGUoZm91dCwgZmluLCAmb2Zmc2V0LCBzdC5zdF9zaXplKTsKCiNlbmRpZgoJCWNsb3Nl KGZpbik7CgkJY2xvc2UoZm91dCk7CgoJfQoJcmV0dXJuIDA7Cn0KCkZZSQpEYXZpZAoK