Hello,
I just downloaded the image for my Pi as well and I also recently
watched Peter Chubb's from 2015 talk regarding his experience and with
SD cards and Linux filesystems. https://www.youtube.com/watch?v=K3zb6p0thQU
There he notes that most MCUs and firmwares work with a 4M alignment
size. Hence the general recommendation appears to be to keep the MBR
table in that first 4M block and align the first partition start to
address 4096. This seems to be what the official formatting tool of the
SD Association does.
When I flashed the current Tumbleweed JeOS image to my SD card with dd I
noticed that the partition starts at 2048. Other partition start
addresses do not appear to fit into the physical 4M block size either.
Swap starts at 133120 (divided by 4098 equals 32.5) and does not align,
Root at 11571120 (divided by 4098 equals 2823.60...).
So hence to improve performance the alignment of the partitions on the
image should be fixed. The question is how.
Best regards
Tamara
On 29/10/2020 09:51, Freek de Kruijf wrote:
Op woensdag 28 oktober 2020 16:02:44 CET schreef Freek de Kruijf:
Once the system is up, it behaves normal/fast. I don't have another RPi4. I
could try another uSD, but considering it is fast when it is up I have no
hopes. The uSD i use now is a Sandisk Ultra with 128GB and an encircled 10.
Also putting the image on it is fast.
Cheers,
Guillaume
Another observation is that another uSD with Raspbian is working normally.
Boots in less than a minute. So it is NOT the RPi4.
openSUSE shows a number of tests on different partitions, before it finds a
bootable image and gives an error message that an image has not been found.
Will try the uSD with Raspbian with openSUSE.
--
Tamara Schmitz
SCC Team
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5
90409 Nürnberg
Germany
HRB 36809, AG Nürnberg
Geschäftsführer: Felix Imendörffer
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