Re: [OE-core][PATCH v2] rng-tools: Replace obsolete "wants systemd-udev-settle"

[Dragos-Marian Panait <dragos.panait@windriver.com>]

It seems that this change introduced a boot delay for qemux86-64 + 
systemd build.

Steps:

git clone git://git.yoctoproject.org/poky
. poky/oe-init-build-env

add to conf/local.conf:

DISTRO_FEATURES:remove = " sysvinit"
DISTRO_FEATURES:append = " systemd"
VIRTUAL-RUNTIME_init_manager = "systemd"
DISTRO_FEATURES_BACKFILL_CONSIDERED = ""

bitbake core-image-full-cmdline

Cause of boot delay:
[ TIME ] Timed out waiting for device /dev/hwrng.
[DEPEND] Dependency failed for Hard…e RNG Entropy Gatherer Daemon.

Regards,
Dragos

On 04.08.2022 18:09, Drew Moseley wrote:
> [Please note: This e-mail is from an EXTERNAL e-mail address]
>
> From: Drew Moseley <drew@moseleynet.net>
>
> The systemd-udev-settle service is listed as obsolete and does in
> some cases result in a significant boot time.  Replace that with a
> specific wait for the random source hardware device to be loaded.
>
> Before this change:
>
>     Startup finished in 4.025s (kernel) + 2min 13.236s (userspace) = 2min 17.262s
>     multi-user.target reached after 2min 8.153s in userspace
>
> After this change:
>
>     Startup finished in 3.956s (kernel) + 13.294s (userspace) = 17.250s
>     multi-user.target reached after 9.522s in userspace
>
> Signed-off-by: Drew Moseley <drew@moseleynet.net>
> ---
>   meta/recipes-support/rng-tools/rng-tools/rngd.service | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/meta/recipes-support/rng-tools/rng-tools/rngd.service b/meta/recipes-support/rng-tools/rng-tools/rngd.service
> index 568686e80e..0f50890dcb 100644
> --- a/meta/recipes-support/rng-tools/rng-tools/rngd.service
> +++ b/meta/recipes-support/rng-tools/rng-tools/rngd.service
> @@ -3,7 +3,8 @@ Description=Hardware RNG Entropy Gatherer Daemon
>   DefaultDependencies=no
>   After=systemd-udev-settle.service
>   Before=sysinit.target shutdown.target
> -Wants=systemd-udev-settle.service
> +Requires=dev-hwrng.device
> +After=dev-hwrng.device
>   Conflicts=shutdown.target
>
>   [Service]
> --
> 2.37.1
>
>
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