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)

[Tim Gardner]

Acked-by: Tim Gardner <tim.gardner at canonical.com>

On 12/15/21 8:32 AM, 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(-)
> 

-- 
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Tim Gardner
Canonical, Inc