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. >> -- To unsubscribe, e-mail: opensuse-arm+unsubscr...@opensuse.org To contact the owner, e-mail: opensuse-arm+ow...@opensuse.org
