ACK: [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)

Kleber Souza kleber.souza at canonical.com
Wed Dec 15 16:02:02 UTC 2021


On 15.12.21 16:32, Juerg Haefliger wrote:
> 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(-)
>

Acked-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>

Thanks




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