From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f175.google.com (mail-pg1-f175.google.com [209.85.215.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E9ED67E3E for ; Wed, 21 Sep 2022 04:44:25 +0000 (UTC) Received: by mail-pg1-f175.google.com with SMTP id c7so4753693pgt.11 for ; Tue, 20 Sep 2022 21:44:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date; bh=QvCStQH9wWobodRWutr5mV7TPPRrro8caiAVbbSMeAw=; b=M9IoHazJ/8Rc9MI/UxoGN6jKsOSMKrX35y2GS7AqghechlMDFEjsoh1s/lf+GHffGG UaBc4NhH61owmUpUxeestiA8RxhGObHEfx2yiSd+YoUTeV/TJKq90ORHobvV67mo3Y3x 2mUwTHxUiObzLSMGR0lUfDfjapQYbQjI4GUaSmUt1A16poWNCsuW9O1meos3q6Mlp17o sZQ86rPyOt2FSoIVVO9bjxCGs/BD/alvJ5a7X3PuQOE4vP5YsnK8A5l5+jlgWu7Vpp9J UpkHkXGLUCBbjSEe83weEn089+idev3Ij8hfatBBkMM0nY9QK9vjFW84yppYqr0CFlrD CaTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date; bh=QvCStQH9wWobodRWutr5mV7TPPRrro8caiAVbbSMeAw=; b=quE5iofCq8kNXGPFEH8nGmqklrHqkYsUqTqTW2jPw9LVDYl0Od+jwS65dArj+WD8nT XcNqA984RFIkMOnAYv/g5kSNylY+5fwPDLOGj5uQOwiPsS9+RM3Szbm7gCcBbKrZ/pZU Cnz+chv7arXwRWXFwdRXzql91KryWdlLrrUcVegeoDUvE71pVeVFrUO9FGQZf8bPgUVG WQspE58uLsDMNNpVqpIpzgsGtH44zIGGSa1blJMbZ+LW5xBWsvlsJim++p1cOyFT6N5Y 2jLJqcblfAJbaoO0AerKDx9dp8mixJPIVVkirJBmm6epHocWJfJNtCVpsDkkoeuuWRRJ hcfA== X-Gm-Message-State: ACrzQf1oUpkjTUIKJ3Oj4+rwWX1TcdB3NFkOxQ+A8DVijZCF+m35eJcA O7aj6DvowV29Mty5NS2YIb8= X-Google-Smtp-Source: AMsMyM7XhRL4gXDZPwHm37mPuhOCN3dCuo6MXMRo9ipXtoy/jcC/OZmhnXvBwwsLUo5tYDBrbSy20g== X-Received: by 2002:a63:86c6:0:b0:43a:bd68:5075 with SMTP id x189-20020a6386c6000000b0043abd685075mr8103197pgd.512.1663735465393; Tue, 20 Sep 2022 21:44:25 -0700 (PDT) Received: from localhost ([2406:7400:63:83c4:dfab:3b6f:2c7f:db86]) by smtp.gmail.com with ESMTPSA id r2-20020a170902c60200b0016dc2366722sm825262plr.77.2022.09.20.21.44.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Sep 2022 21:44:24 -0700 (PDT) Date: Wed, 21 Sep 2022 10:14:19 +0530 From: "Ritesh Harjani (IBM)" To: hazem ahmed mohamed Cc: "linux-ext4@vger.kernel.org" , "tytso@mit.edu" , "adilger.kernel@dilger.ca" , "regressions@lists.linux.dev" , "stable@vger.kernel.org" , "Mohamed Abuelfotoh, Hazem" Subject: Re: Ext4: Buffered random writes performance regression with dioread_nolock enabled Message-ID: <20220921044419.epojssm3g4j3qkup@riteshh-domain> References: Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On 22/09/19 04:18PM, hazem ahmed mohamed wrote: > Hey Team, > > > > I am sending this e-mail to report a performance regression that’s > caused by commit 244adf6426(ext4: make dioread_nolock the default) , I > am listing the performance regression symptoms below & our analysis > for the reported regression. > Although you did mention you already tested on the latest kernel too and there too you saw a similar performance regression. But no harm in also double checking if you have this patch [1]. This does fixes a similar problem AFAIU. [1]: https://lore.kernel.org/linux-ext4/20200520133119.1383-1-jack@suse.cz/ -ritesh