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 E791BC77B7D for ; Mon, 8 May 2023 02:22:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230187AbjEHCWQ (ORCPT ); Sun, 7 May 2023 22:22:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59184 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229744AbjEHCWO (ORCPT ); Sun, 7 May 2023 22:22:14 -0400 Received: from mail-wm1-x32d.google.com (mail-wm1-x32d.google.com [IPv6:2a00:1450:4864:20::32d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6274B2695; Sun, 7 May 2023 19:22:13 -0700 (PDT) Received: by mail-wm1-x32d.google.com with SMTP id 5b1f17b1804b1-3f37a36b713so40581885e9.1; Sun, 07 May 2023 19:22:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1683512532; x=1686104532; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=8BqRI8xckUuiTetI+oWbedIhDWXvMt/WNoJrYRkwROY=; b=kNV+iSNaYwjLPsnYaNwpAPejOLI83QKH9x4VUqExG6LQJbOC7nmV1CkbcOWpuQOEZh pJZ4GwTLTXl4Sj7TaIgv6K2qzE7CCW5XreRAqfU8oufV+gBjwE5MLPvvTSFso31gd0WM DVtbHtTMCHcrFpNYSzHV+04ISA9eJdMYf3UaNobFJB39PObKQ7nhLX/TmcVosSE31IE/ vimWGY3OKaKLQtTXrPok6UZ1sg0g16RPYk7kMjgsV9b5Y+EbPWTiaPCpVwc82G4yafwo i2ccDOq8i7JJ2mrWrSVnSwue3BM5GXYZXnUXqw0Hzyvhwya9uQWJGCKdT4G9s1zGHTmr Wt1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683512532; x=1686104532; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=8BqRI8xckUuiTetI+oWbedIhDWXvMt/WNoJrYRkwROY=; b=Ur/MxhEWWUXhz6eBtWdxlN1InGl0s0Ij9k3AEyRVo+CTumCUXPxzvOLq3U2c3GEFUp YzjR8kIfhxiqZsHRRZQM1OtsmqpQLkrpBMgG0apjOdEz3MhCdxPlWSE0uKTuoXcuwKFZ RC/E55C1jB/JTUVVshpAG8ywZiYB/CXGwODiX3i8eHUnRcqx5xLzuNaZtw3Rawyfxk7F KZqCifELgcpL79UO2oxmfzxe7O18fqqE37PS8UtzYFZ589/0cXMis56Tui9wYQFuucIB Rl0z7FdgMXCIDfToX5xUKrLl4BnvpTDn8qQj20ZqBswF22bQepNbPER0k+0aWTqkdCNe U0vA== X-Gm-Message-State: AC+VfDx+dTlY0unZfaYv0CVZQYsuBbMb1AlTB6NORsWCVO0FftCy6kcC adLQXiQVXQZwsmUZDIXZie4= X-Google-Smtp-Source: ACHHUZ5QGWjbfDj0vSBgRk8qSRZJleSs23j6grx5VOgIcaGcGKs23aWJO03b0x1fBf5Saq4A8YO+Dg== X-Received: by 2002:adf:fdcc:0:b0:307:7e68:3a47 with SMTP id i12-20020adffdcc000000b003077e683a47mr6037837wrs.37.1683512531565; Sun, 07 May 2023 19:22:11 -0700 (PDT) Received: from [192.168.8.100] (188.30.86.13.threembb.co.uk. [188.30.86.13]) by smtp.gmail.com with ESMTPSA id e1-20020a5d4e81000000b003062765bf1dsm9757750wru.33.2023.05.07.19.22.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 07 May 2023 19:22:11 -0700 (PDT) Message-ID: Date: Mon, 8 May 2023 03:16:10 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [LSF/MM/BPF TOPIC] ublk & io_uring: ublk zero copy support To: Ming Lei , Bernd Schubert Cc: Jens Axboe , Miklos Szeredi , Christoph Hellwig , Ziyang Zhang , Xiaoguang Wang , "lsf-pc@lists.linux-foundation.org" , "io-uring@vger.kernel.org" , "linux-block@vger.kernel.org" References: <41cfb9c2-9774-e9e1-d8e7-4999a710f2e7@ddn.com> Content-Language: en-US From: Pavel Begunkov In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 5/6/23 02:38, Ming Lei wrote: > On Fri, May 05, 2023 at 09:57:47PM +0000, Bernd Schubert wrote: >> Hi Ming, >> >> On 4/29/23 04:18, Ming Lei wrote: >>> Hello, >>> >>> ublk zero copy is observed to improve big chunk(64KB+) sequential IO performance a >>> lot, such as, IOPS of ublk-loop over tmpfs is increased by 1~2X[1], Jens also observed >>> that IOPS of ublk-qcow2 can be increased by ~1X[2]. Meantime it saves memory bandwidth. >>> >>> So this is one important performance improvement. >>> >>> So far there are three proposal: >> >> looks like there is no dedicated session. Could we still have a >> discussion in a free slot, if possible? > > Sure, and we can invite Pavel to the talk too if he is in this lsfmm. I'd love to go but regretfully can't make it -- Pavel Begunkov