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 F1A19C07545 for ; Mon, 23 Oct 2023 02:16:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233105AbjJWCQe (ORCPT ); Sun, 22 Oct 2023 22:16:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46950 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229489AbjJWCQb (ORCPT ); Sun, 22 Oct 2023 22:16:31 -0400 Received: from m1345.mail.163.com (m1345.mail.163.com [220.181.13.45]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 76A1693; Sun, 22 Oct 2023 19:16:27 -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=1HW0ANDOOB5ziqCL5xX6+HVEBIq+Al/PA87Yd2ajnVI=; b=A GP4QGqkmQRFWOiUBBdSHwzAZQrYkAW3ZcPm+B+TMEM/oGpE5BcdxgM3Ekp3qf0hu CZjMk2fKBUlocUmSGtLMQ6J49Ep2HdoSp7gBJezDMn6GjebaXS21OLllOi/ESP7P 7nZlAxmlYYshn8/FCdglDcFJzQ+cuW15V3j+Zf8wmQ= Received: from 00107082$163.com ( [111.35.186.243] ) by ajax-webmail-wmsvr45 (Coremail) ; Mon, 23 Oct 2023 10:16:14 +0800 (CST) X-Originating-IP: [111.35.186.243] Date: Mon, 23 Oct 2023 10:16:14 +0800 (CST) From: "David Wang" <00107082@163.com> To: "Dave Chinner" Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [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 In-Reply-To: References: <28de01eb.208.18b4f9a0051.Coremail.00107082@163.com> X-NTES-SC: AL_QuySCvyZuEss4iKaZOkXn0oTju85XMCzuv8j3YJeN500hynS8DIxUkJzEFTo/d2tCQKqjSWybhFu6OVLUY53XZ09oMdV4q4C066prKtq5lz4 Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=GBK MIME-Version: 1.0 Message-ID: <61f74c43.16f9.18b5a51868f.Coremail.00107082@163.com> X-Coremail-Locale: zh_CN X-CM-TRANSID: LcGowAD3vzRv1zVl0uYWAA--.56189W X-CM-SenderInfo: qqqrilqqysqiywtou0bp/1tbiOwYRqmC5oBhZ1wAEst X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org CgoKQXQgMjAyMy0xMC0yMyAwNjo1MzoxNywgIkRhdmUgQ2hpbm5lciIgPGRhdmlkQGZyb21vcmJp dC5jb20+IHdyb3RlOgoKPgo+T19EU1lOQyBpcyB0aGUgcHJvYmxlbSBoZXJlLgo+Cj5UaGlzIGZv cmNlcyBhbiBJTyB0byBkaXNrIGZvciBldmVyeSB3cml0ZSBJTyBzdWJtaXNzaW9uIGZyb20KPnNl bmRmaWxlIHRvIHRoZSBmaWxlc3lzdGVtLiBGb3Igc3luY2hyb25vdXMgSU8gKGFzIGluICJ3YWl0 aW5nIGZvcgo+Y29tcGxldGlvbiBiZWZvcmUgc2VuZGluZyB0aGUgbmV4dCBJTyksIGEgbGFyZ2Vy IElPIHNpemUgd2lsbAo+KmFsd2F5cyogbW92ZSBkYXRhIGZhc3RlciB0byBzdG9yYWdlLgo+Cj5G V0lXLCB5b3UnbGwgZ2V0IHRoZSBzYW1lIGJlaGF2aW91ciBpZiB5b3UgdXNlIE9fRElSRUNUIGZv ciBlaXRoZXIKPnNvdXJjZSBvciBkZXN0aW5hdGlvbiBmaWxlIHdpdGggc2VuZGZpbGUgLSBzeW5j aHJvbm91cyA2NGtCIElPcyBhcmUKPmEgbWFzc2l2ZSBwZXJmb3JtYW5jZSBsaW1pdGF0aW9uIGV2 ZW4gd2l0aG91dCBPX0RTWU5DLgo+Cj5JT1dzLCBkb24ndCB1c2Ugc2VuZGZpbGUgbGlrZSB0aGlz LiBVc2UgYnVmZmVyZWQgSU8gYW5kCj5zZW5kZmlsZShmZCk7IGZkYXRhc3luYyhmZCk7IGlmIHlv dSBuZWVkIGRhdGEgaW50ZWdyaXR5IGd1YXJhbnRlZXMKPmFuZCB5b3Ugd29uJ3Qgc2VlIGFueSBw ZXJmIHByb2JsZW1zIHJlc3VsdGluZyBmcm9tIHRoZSBzaXplIG9mIHRoZQo+aW50ZXJuYWwgc2Vu ZGZpbGUgYnVmZmVyLi4uLgo+Cj4tRGF2ZS4KPi0tIAo+RGF2ZSBDaGlubmVyCj5kYXZpZEBmcm9t b3JiaXQuY29tCgpUaGFua3MgZm9yIHRoZSBpbmZvcm1hdGlvbiwgYW5kIFllcywgYnVmZmVyZWQg SU8gc2hvd3Mgbm8gc2lnbmlmaWNhbnQgCnBlcmZvcm1hbmNlIGRpZmZlcmVuY2UuCkZlZWwgdGhh dCB0aGlzIHVzYWdlIGNhdmVhdCBzaG91bGQgYmUgcmVjb3JkZWQgaW4gdGhlICJOT1RFIiBzZWN0 aW9uIG9mIG1hbiBwYWdlIGZvciBzZW5kZmlsZS4KClRoYW5rcwpEYXZpZAoKIAo=