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ARM imx.6 SATA speed regression

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  ARM imx.6 SATA speed regression Dan MacDonald <allcoms@gmail.com> - 2017-02-07 12:50 +0100

#1575586 — 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

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