From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f48.google.com (mail-oa1-f48.google.com [209.85.160.48]) (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 994223211 for ; Wed, 21 Sep 2022 12:23:32 +0000 (UTC) Received: by mail-oa1-f48.google.com with SMTP id 586e51a60fabf-1279948d93dso8737436fac.10 for ; Wed, 21 Sep 2022 05:23:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date; bh=3aJj791SFi8MBmk/3DDeNGs8qJFxgSOFtNXhCuwyFlE=; b=gZm6pXwMq2/JC/UTzDilnXvNNyRSckcot0YJ/NTaLbwgqLHVdBCLiaVvIB0NkJ3bmZ 1nk1BYSkGZOBASjKxyjllVNk8cab+Hm+DELpIecZjGPDzX2v6JwuUZjXls2mHcirK/+e GjHbLX+FHDyaNPWfCqF087+Pmtdly7g0V902It5/Dx8SAE/K1+IM5JFG6ucNTT+cOkQf m8u3mwFCbWbPL8pqwWcIkjsxR8riTQ9TH/I8mBcIyfB08ZYi+DoeoHcsYYgHLNBEQyFC KgihHc1TC+jck3iRBGiWUKBctERjn3cr1gNKfLL4FDlLcx9b8NBlZbFIrHHHViZYVUGz VmkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date; bh=3aJj791SFi8MBmk/3DDeNGs8qJFxgSOFtNXhCuwyFlE=; b=l/J7v16ClD6G2G6Hc5+4j5PybO2lDQu1fvBhMqpWP2qQB35/m5CLY1DY5oFpnJSGh/ asmpj7s2pQKLi1kbe1bzY7e9idzeQ1Lcuwd921vgBm1LNdUENlyB3fY1l6km171DrOmM rMrV/DMx+U3qIYw81Af6rs6EYxKiQCbaLy0NPTvB9oWYXqPRyrumYyUumlOJI5sF55Ri F0NUWQuqMLy2XguawyX8KmG6ok1j67saqn6UNtRNBAJiDEs2+31aaTcms8d6crIL1JM/ Cl1ZO6Pvj0D7OOmOGswG7jQwSMbEtN+1y0nBB6qtv8DBivbQVj/nU2syn/XNGsmq0nyq HOdg== X-Gm-Message-State: ACrzQf0oCPRqJ/6dVQeWOSws3NF7TSWLJQ3VXybOycAClLDDbWBb7oBD aTzLOgY5AMQDyu1oJL0/M35KqsqCdMQxYl6KncU= X-Google-Smtp-Source: AMsMyM5ErvoOnIfJMUuBO4BbuAQd4iK1fvd9USzMtEX4sLhb80TdK3rfkL+JCPZ9lgL8+EHwcHMCghXo3GDIFPNl3xA= X-Received: by 2002:a05:6870:a78e:b0:12b:542b:e5b2 with SMTP id x14-20020a056870a78e00b0012b542be5b2mr4900564oao.112.1663763011355; Wed, 21 Sep 2022 05:23:31 -0700 (PDT) Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20220921044419.epojssm3g4j3qkup@riteshh-domain> In-Reply-To: <20220921044419.epojssm3g4j3qkup@riteshh-domain> From: hazem ahmed mohamed Date: Wed, 21 Sep 2022 13:22:55 +0100 Message-ID: Subject: Re: Ext4: Buffered random writes performance regression with dioread_nolock enabled To: "Ritesh Harjani (IBM)" Cc: "linux-ext4@vger.kernel.org" , "tytso@mit.edu" , "adilger.kernel@dilger.ca" , "regressions@lists.linux.dev" , "stable@vger.kernel.org" , "Mohamed Abuelfotoh, Hazem" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Thanks for sharing that unfortunately this patch has been merged to kernel 5.7 and I am still seeing that regression with later versions that include that patch. Hazem. On Wed, 21 Sept 2022 at 05:44, Ritesh Harjani (IBM) wrote: > > On 22/09/19 04:18PM, hazem ahmed mohamed wrote: > > Hey Team, > > > > > > > > I am sending this e-mail to report a performance regression that=E2=80= =99s > > 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.c= z/ > > -ritesh