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Date: Wed, 24 Nov 2021 07:53:52 -0800
From: bob prohaska <fbsd@www.zefox.net>
To: Juan David Hurtado G <jdhurtado@orbiware.com>
Cc: freebsd-arm@freebsd.org
Subject: Re: 13.0-RELEASE Poor performance on Raspberry pi 3 B+
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On Wed, Nov 24, 2021 at 09:33:33AM -0500, Juan David Hurtado G wrote:
> Thanks to @evadot and @f451 on Discord, seems there is the issue:
> 
> Raspberry Pi 3B+
> 
> ```
> root@generic:~ # dmesg | grep -i mmcsd
> mmcsd0: 31GB <SDHC SPCC 2.0 SN 1072013D MFG 08/2017 by 49 SP> at mmc0
> 0.4MHz/4bit/65535-block
> ```
> 
> Raspberry Pi 4 with a different card:
> ```
> mmcsd0: 31GB <SDHC 00000 0.0 SN 0000509F MFG 09/2019 by 159 TI> at mmc1
> 0.4MHz/4bit/65535-block
> ```
> 
> So no matter the pi or the card, the microsd clock is at 0.4MHz while in
> raspios same cards gets 50 MHz apparently
> 
> Seems that explain the behaviour... So is this a FreeBSD bug? or a card
> issue even if I've tested with different cards?
> 
> PS: A brand new sandisk ultra is on the way so I can test with it.
> 

Very strange. I get

bob@www:~ % dmesg | grep -i mmcsd
mmcsd0: 64GB <SDHC EC2QT 3.0 SN 5A4667E1 MFG 08/2019 by 27 SM> at mmc0 50.0MHz/4bit/65535-block

on an old Pi2 running
FreeBSD www.zefox.net 12.2-STABLE FreeBSD 12.2-STABLE r370512 GENERIC  arm

and

root@pelorus:/home/bob # dmesg | grep -i mmcsd
mmcsd0: 16GB <SDHC SL16G 8.0 SN BAAB3C19 MFG 11/2016 by 3 SD> at mmc0 50.0MHz/4bit/65535-block

on a Pi3 running
FreeBSD pelorus.zefox.org 13.0-RELEASE FreeBSD 13.0-RELEASE #0 releng/13.0-n244733-ea31abc261f: Fri Apr  9 06:06:55 UTC 2021     root@releng1.nyi.freebsd.org:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC  arm64

HTH,

bob prohaska