linux-kernel - ARM imx.6 SATA speed regression

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Message-ID: <CANOoOjvfF6Yrmj=+QXQXWOwQ8D7YcrVk-Nyvp5Uz8r7i4fVLyA@mail.gmail.com>
Date:   Tue, 7 Feb 2017 11:41:26 +0000
From:   Dan MacDonald <allcoms@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: ARM imx.6 SATA speed regression

Hi LKML

I recently got a SABRE Lite, iMX.6q based SBC. I bought this board
over the RPi3, for example, because I wanted SATA and open source
graphics drivers via etnaviv / armada.

Under Arch Linux ARM with Linux 4.9.0, hdparm said I was getting an
average of ~120 MB/s buffered disk read speed. After upgrading to
Linux 4.9.8 buffered read speed is just under 90 MB/s. That's a
notable hit! I both cases I was running the stock ALARM armv7h kernel
package.

Might any of you Linux ARM devs know what has changed since 4.9.0 that
could cause such a big decrease in SATA IO?

Thanks