linux-ext4 - Re: Ext4: Buffered random writes performance regression with dioread

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Date:   Wed, 21 Sep 2022 13:22:55 +0100
From:   hazem ahmed mohamed <hazem.ahmed.abuelfotoh@...il.com>
To:     "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Cc:     "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "tytso@....edu" <tytso@....edu>,
        "adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "Mohamed Abuelfotoh, Hazem" <abuehaze@...zon.com>
Subject: Re: Ext4: Buffered random writes performance regression with
 dioread_nolock enabled

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)
<ritesh.list@...il.com> 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’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