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=-2.7 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 B49CDC433EF for ; Wed, 8 Sep 2021 11:54:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 914C660187 for ; Wed, 8 Sep 2021 11:54:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348488AbhIHLzU (ORCPT ); Wed, 8 Sep 2021 07:55:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344680AbhIHLzU (ORCPT ); Wed, 8 Sep 2021 07:55:20 -0400 Received: from mail-yb1-xb36.google.com (mail-yb1-xb36.google.com [IPv6:2607:f8b0:4864:20::b36]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 57826C061575 for ; Wed, 8 Sep 2021 04:54:12 -0700 (PDT) Received: by mail-yb1-xb36.google.com with SMTP id c6so3620813ybm.10 for ; Wed, 08 Sep 2021 04:54:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=guPTVDMfMGoreIPs2jU3dC3bPzU9cD9Yg2J+X8/N25M=; b=aufXl+6bwMUtgvbixcMb0HhrEfFTT7+loeWlfI3ICn5UCSPkz1VaBX7tRdQNTq2P2t o8uHuy8XoSHH+ynGFmgTp1q8fwT7VBVu0sl+Qv3y4sOjk/d0+TlXoTk1JHSp4LlxjOHt k8p4IgQ2/Nvpxzwx3+B9PQBsjN3usRzD9O+X2Ms17TTa72ZUZGjg81GZIhlJrB9FETL3 y3R2Jx/z4Csi3Q6B0w+YDvBPMCqyhuuw2kYU9tB64zs2RQcRedheIPMaJJQp9TNyw3yx Uz0Xtb4DpE99wCEdgZpsG6yvAToAva0ca7DFFGgFeM5SyVAMLxvfpDnUo0t1xHpjqmRh tYVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=guPTVDMfMGoreIPs2jU3dC3bPzU9cD9Yg2J+X8/N25M=; b=2jyD+9UWNhQtvAl+RY84ShDf/ToL+BHM2CyUtJx85Mc0HOE+BcpeePG4+6kkr4piXM ZL7328pLEefhW0eOs5OLDZTImamMM7z4W0BagRStCQAoWUY6nNWEPuhwIn2SZa6ZF5wd B0i5hoZdcv+nfo1qg6GZK/njhNp9vOrq3TaA+xDxKeiMIFMagpUABtmklyNXeOoN3nJD nqqyW5d1WREutuSkF27k7phm0Vdp/3+KPu5WDw3T4bnC9/peQcMoMcirwyQIG+cFC11M CsODtQWeOKoitqkdQNkhrp148n4wyJDMpN4uBzAIPflPqiok9eXSj8cyygL009ezV2Po 92og== X-Gm-Message-State: AOAM533ukIPP9utaLrp3A2T6ztJI20mjENNRu8KwBcMxgywMx6kAHrHD hYnApafZc5h4fOQwu6AdFnvw5y5tqotSA8Eu8yI= X-Google-Smtp-Source: ABdhPJzU338oK0BjWBM4L/pu/MmGiM4Qu5hGZ2aKepfJPynKkITvUg/Fy5VERYJmfoXkkJWdV14B/EfbDH8unJCDAQg= X-Received: by 2002:a25:dd6:: with SMTP id 205mr3260562ybn.82.1631102051630; Wed, 08 Sep 2021 04:54:11 -0700 (PDT) MIME-Version: 1.0 References: <9025606c-8579-bf81-47ea-351fc7ec81c3@kit.edu> <867506cc-642e-1047-08c6-aae60e7294c5@criteo.com> <5b58a227-c376-1f3e-7a10-1aa5483bdc0d@kit.edu> <1b1c961d-ddba-18de-e0ff-fd8cf60f5da8@kit.edu> <74c59a8b-9475-6554-7d93-f9c5f26cc652@criteo.com> <2df22c68-6040-298e-4512-752cd10b7201@kit.edu> <5015f1e3-eaeb-ef9e-e530-83c21db5aeb7@criteo.com> <77b67cc0-30c1-70a8-438b-f1bcf1fdb295@kit.edu> In-Reply-To: <77b67cc0-30c1-70a8-438b-f1bcf1fdb295@kit.edu> From: Sitsofe Wheeler Date: Wed, 8 Sep 2021 12:53:45 +0100 Message-ID: Subject: Re: Question: t/io_uring performance To: Jens Axboe Cc: Erwan Velu , "fio@vger.kernel.org" , Hans-Peter Lehmann Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: fio@vger.kernel.org (CC'ing Jens directly in case he missed the previous messages) On Mon, 6 Sept 2021 at 15:28, Hans-Peter Lehmann wrote: > > Hi Jens, > > not sure if you have read the emails in this thread - now trying to addre= ss you directly. Both Erwan and me are unable to reproduce your single-thre= aded IOPS measurements - we don't even get close to your numbers. The bottl= e-neck seems to be the CPU, not the SSDs. Did you use some special configur= ation for your benchmarks? > > Best regards > Hans-Peter > > (I have also reproduced the behavior with an Intel processor now - the si= ngle-threaded throughput is also capped at around 580k IOPS, even though th= e SSDs can handle more than that when using multiple threads) --=20 Sitsofe