Received-SPF: pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Wed, 21 Sep 2022 10:14:19 +0530
From:   "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
To:     hazem ahmed mohamed <hazem.ahmed.abuelfotoh@gmail.com>
Cc:     "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
        "tytso@mit.edu" <tytso@mit.edu>,
        "adilger.kernel@dilger.ca" <adilger.kernel@dilger.ca>,
        "regressions@lists.linux.dev" <regressions@lists.linux.dev>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "Mohamed Abuelfotoh, Hazem" <abuehaze@amazon.com>
Subject: Re: Ext4: Buffered random writes performance regression with
 dioread_nolock enabled
Message-ID: <20220921044419.epojssm3g4j3qkup@riteshh-domain>
References: <CACX6voDfcTQzQJj=5Q-SLi0in1hXpo=Ri28rX73Og3GTObPBWA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CACX6voDfcTQzQJj=5Q-SLi0in1hXpo=Ri28rX73Og3GTObPBWA@mail.gmail.com>
Precedence: bulk

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