linux-ext4 - Help: ext4 jbd2 IO requests slow down fsync

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Message-ID: <CACZyaBsCb7KxQce27C79WhD5BKekq4Gi4z_P4h_xYvQ8_zv26A@mail.gmail.com>
Date:   Thu, 23 Jan 2020 22:28:47 -0800
From:   Colin Zou <colin.zou@...il.com>
To:     linux-ext4@...r.kernel.org
Subject: Help: ext4 jbd2 IO requests slow down fsync

Hi,

I used to run my application on ext3 on SSD and recently switched to
ext4. However, my application sees performance regression. The root
cause is, iosnoop shows that the workload includes a lot of fsync and
every fsync does data IO and also jbd2 IO. While on ext3, it seldom
does journal IO. Is there a way to tune ext4 to increase fsync
performance? Say, by reducing jbd2 IO requests?

Thanks,
Colin