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 X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 89AF6C2D0A3 for ; Thu, 12 Nov 2020 15:18:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C5072074B for ; Thu, 12 Nov 2020 15:18:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="qUNKtnFY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728345AbgKLPR7 (ORCPT ); Thu, 12 Nov 2020 10:17:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727796AbgKLPR6 (ORCPT ); Thu, 12 Nov 2020 10:17:58 -0500 Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD1A5C0613D1 for ; Thu, 12 Nov 2020 07:17:58 -0800 (PST) Received: by mail-pf1-x434.google.com with SMTP id c20so4804018pfr.8 for ; Thu, 12 Nov 2020 07:17:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=ByBpsYUeNJE4F9ozX9/ObO8RQeu8DVYKPnXQJuXBxAM=; b=qUNKtnFYCrOff6w+Wb+WMmPQROdAdvA1eg6gP7UhDE4i5vhrCOi/zPsOXaXuFx4sWA 4utlxoW9Us0XcSaqltcHUNhv9LzOO/ucnfMGN4Y7OXRJOsiX2LxuQDKC9BYCawoECSAI DzIZUlK3YpXwyXGNgWogIPc5wTJGQC5/PtEDgtGeLfVMrVfQOQhBnPXIhtHCMTJ+vmSi NvADSomCvnhh6FDMNU/COAAQyGwCn8RwJ0j0kU8M2pA26MqlFa6EQEFU+7+ECn4zgBO8 ssQPxVWbsXoORLa0eGuA6fgg+VWk3PG/Yl6AZuKo+6qS5j432EaK6vPCHicM/ZKgaU/u AFAg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=ByBpsYUeNJE4F9ozX9/ObO8RQeu8DVYKPnXQJuXBxAM=; b=P6myBlQopylbpu2mZ/tSEWGjGtW7VvOrS4y90T0rBwBE+5F5jphHS1XirMwg7Zf+i6 iZgnq7gEjCpw0jJtALSXSUEelCi68xoer8Dy/fbCSzd43+tSOVrF2F0djul6zoDqNe/U DzLT7sf9waP8oSBc1k1pX9odL292UukY8byA3YWBQxeZuB/hCqTmMVU1nzL33ytkkV+1 2KtToViYJ5VIqgxlUTZeCiecBc6mUzNNrDNM0T+2g1F6Yw+uNqwKg5mPDz3SssSUFjgQ TIURKM/pOJh8NMDEkqjjqPUAScWvaXLckPDGnX6NOkPbqtRkwARZ/FqNam1IzIKndDNr TJFQ== X-Gm-Message-State: AOAM532qdFKj0Su+rJz0BynbPamsA6lNElZhh+5aYyJlLZneMDsYMzR6 f2herV6dOU67ZJTdXNNKOAsQ25kodlhuLTHCz2HDHWQ/yOJlww== X-Google-Smtp-Source: ABdhPJynaav1i22EqbCswcyALbTwpiqzMOaTjy2tFpjb86WmajNcC2MP9bn9zt0Uedx9nNGniIVuUigk1nV7tSOHy2A= X-Received: by 2002:a62:834a:0:b029:18a:e0b1:f0d9 with SMTP id h71-20020a62834a0000b029018ae0b1f0d9mr43580pfe.73.1605194278336; Thu, 12 Nov 2020 07:17:58 -0800 (PST) MIME-Version: 1.0 From: Sage Meng Date: Thu, 12 Nov 2020 23:17:45 +0800 Message-ID: Subject: Is there a way to make Cephfs kernel client to send data to Ceph cluster smoothly with buffer io To: ceph-devel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Hi All, Cephfs kernel client is influenced by kernel page cache when we write data to it, outgoing data will be huge when os starts to flush page cache. So Is there a way to make Cephfs kernel client to send data to ceph cluster smoothly when buffer io is used ? Better a way that only influence Ceph IO not the whole system IO.