[SRU][I/raspi][H/raspi][F/raspi][B/raspi-5.4][B/raspi2][PATCH 0/1] Boot time from snap in 20/stable increases boot time on 3.5 seconds (LP: #1948807)

[Juerg Haefliger]

https://bugs.launchpad.net/bugs/1948807

[ Impact ]

I am seeing what looks as a regression in pi-kernel snap for UC20: there are around 3.5 additional seconds spent in boot time. In the image from cdimage (2021-06-30), I see:

[    1.856540] random: crng init done
[    1.871798] loop: module loaded

(see https://paste.ubuntu.com/p/CkfWXY5Vgf/)
while if I build an image from latest snaps in the 20/stable channel, I get:

[    1.855481] random: crng init done
[    5.349491] loop: module loaded

(see https://paste.ubuntu.com/p/CNt42gdDcZ/)
The pi-kernel snap revision is 353.

[ Test Case ]

$ sudo dmesg | grep -B1 -A1 'loop: module'
[    0.791122] cacheinfo: Unable to detect cache hierarchy for CPU 0
[    4.903386] loop: module loaded
[    4.906092] spi-bcm2835 fe204000.spi: could not get clk: -517

[ Fix ]

Set CONFIG_BLK_DEV_LOOP_MIN_COUNT to the default value (8).

[ Where Problems Could Occur ]

Loop devices need to be created on-demand if more than 8 are required. If that fails, user space will fail.


Juerg Haefliger (1):
  UBUNTU: [Config] raspi: Set BLK_DEV_LOOP_MIN_COUNT=8

 debian.raspi/config/config.common.ubuntu | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.30.2