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=-5.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 5F360C432BE for ; Fri, 6 Aug 2021 02:43:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4463261186 for ; Fri, 6 Aug 2021 02:43:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233428AbhHFCnh (ORCPT ); Thu, 5 Aug 2021 22:43:37 -0400 Received: from mail-pj1-f48.google.com ([209.85.216.48]:54839 "EHLO mail-pj1-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232442AbhHFCna (ORCPT ); Thu, 5 Aug 2021 22:43:30 -0400 Received: by mail-pj1-f48.google.com with SMTP id a8so13730962pjk.4; Thu, 05 Aug 2021 19:43:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=w+3fDpFiOzl/w0HBn5g3m6GV7Q8q6gv5EmN0f1j9vjQ=; b=tv3/q6WOGL4dOrGo3os3qN7hPSDupQGOVPCRzbKoTYooWqpcGDRWagf/9DROnDDQjp XrPtOqboxOv3dYiUjJCpJX8mRbgCJtL1XuW1wW6DXaFcdkJlpia4OnE7k3Ef0KqzkBvN zg+xgl7QksPo2cvxyNBqWflqeqctgfaM4ISHyHsLNTLbB8SB/BVXv5BhuYPgUFW0/JP4 GwVyoVRBlVOSxQV1jRJ9t1mSbS+7MQ2Vm7z00kn3+tUqGJ3meEoTC9YKe4/4txEVVMpG lRqIGhQTz2jxifD9pSnn5sXLao8blTs0XJmX52oHDFcs1JG+0qJS0jpHdJ98H3dTwl9m KLsw== X-Gm-Message-State: AOAM5309Ppyh+xs/gWRVqeQuPFvgjCxSBSXdlvagf35/b/UmviqlsBZ6 qPanU2EhyMrU5WI7HtkQ/Xk= X-Google-Smtp-Source: ABdhPJyA5uWXSQSPwMbYqf1DXcRcFOPj3kbkGxMxdQI8drkkDVJ4KbJPtOUPQb36OyT7aHYZQaURgg== X-Received: by 2002:a17:90a:ca0f:: with SMTP id x15mr17908632pjt.78.1628217793840; Thu, 05 Aug 2021 19:43:13 -0700 (PDT) Received: from ?IPv6:2601:647:4000:d7:e704:5548:215f:29bb? ([2601:647:4000:d7:e704:5548:215f:29bb]) by smtp.gmail.com with ESMTPSA id t8sm10717487pja.41.2021.08.05.19.43.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Aug 2021 19:43:12 -0700 (PDT) Subject: Re: [PATCH] blk-mq: allow hardware queue to get more tag while sharing a tag set To: "yukuai (C)" , axboe@kernel.dk, ming.lei@redhat.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yi.zhang@huawei.com References: <20210712031818.31918-1-yukuai3@huawei.com> <5ab07cf8-a2a5-a60e-c86a-ab6ea53990bb@huawei.com> <07d2e6ba-d016-458a-a2ce-877fd7b72ed0@acm.org> From: Bart Van Assche Message-ID: Date: Thu, 5 Aug 2021 19:43:11 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/mixed; boundary="------------1060257EAADDFC7E70C1AFA3" Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a multi-part message in MIME format. --------------1060257EAADDFC7E70C1AFA3 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit On 8/5/21 6:50 PM, yukuai (C) wrote: > After applying this configuration, the number of null_blk in my > machine is about 650k(330k before). Is this still too low? That seems low to me. If I run the attached script on a six year old desktop with an eight core i7-4790 CPU it reports a little more than 5 million IOPS. Has kernel debugging perhaps been enabled in the kernel on the test setup? Or is the system perhaps slowed down by security mitigations? > By the way, there are no performance degradation. Please wait with drawing a conclusion until you can run a workload on your setup of several million IOPS. 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