30.10.2020 13:06, Tamara Schmitz пишет:
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.
There is KIWI option <type image="oem" disk_start_sector="XXX" ... Though I am not sure you will see the considerable gain.
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.
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