[ptxdist] [PATCH] prelink: first boot warning

[ptxdist] [PATCH] prelink: first boot warning

[Bruno Thomsen]

Running prelink with rc.once.d causes a first boot stall
of about 2 minutes on Freescale i.MX28 454MHz ARM9 processor.
This can be expensive if first device boot is during product
manufacturing (assembly, programming, configuration, test).

Signed-off-by: Bruno Thomsen <bth@kamstrup.com>
---
 rules/prelink.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rules/prelink.in b/rules/prelink.in
index 5d04fb0..1e06200 100644
--- a/rules/prelink.in
+++ b/rules/prelink.in
@@ -21,6 +21,7 @@ config PRELINK_RC_ONCE
 	help
 	  install a script that will be run on the first boot to
 	  prelink all programs and libraries.
+	  warning! this can increase first boot with a few minutes!
 
 config PRELINK_SKIP_ON_NFSROOT
 	bool
-- 
1.9.1


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Re: [ptxdist] [PATCH] prelink: first boot warning

[Jürgen Borleis]

Hi Bruno,

On Thursday 18 June 2015 14:51:39 Bruno Thomsen wrote:
> Running prelink with rc.once.d causes a first boot stall
> of about 2 minutes on Freescale i.MX28 454MHz ARM9 processor.
> This can be expensive if first device boot is during product
> manufacturing (assembly, programming, configuration, test).
>
> Signed-off-by: Bruno Thomsen <bth@kamstrup.com>
> ---
>  rules/prelink.in | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/rules/prelink.in b/rules/prelink.in
> index 5d04fb0..1e06200 100644
> --- a/rules/prelink.in
> +++ b/rules/prelink.in
> @@ -21,6 +21,7 @@ config PRELINK_RC_ONCE
>  	help
>  	  install a script that will be run on the first boot to
>  	  prelink all programs and libraries.
> +	  warning! this can increase first boot with a few minutes!

With Using a recent linker the prelink becomes redundant. It is already done 
when the linker hash-style it set to "gnu" (which is the default in a recent 
PTXdist).
Or did you still see improvements with or without the pre-link step and that's 
why you are still using this feature?

Regards,
Juergen

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Pengutronix e.K.                              | Juergen Borleis             |
Industrial Linux Solutions                    | http://www.pengutronix.de/  |

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Re: [ptxdist] [PATCH] prelink: first boot warning

[Bruno Thomsen]

Hi Juergen,

> > Running prelink with rc.once.d causes a first boot stall of about 2 
> > minutes on Freescale i.MX28 454MHz ARM9 processor.
> > This can be expensive if first device boot is during product 
> > manufacturing (assembly, programming, configuration, test).
>
> With Using a recent linker the prelink becomes redundant. It is already done when the linker hash-style it set to "gnu" (which is the default in a recent PTXdist).
> Or did you still see improvements with or without the pre-link step and that's why you are still using this feature?

The feature was enabled by mistake during a ptxdist upgrade from 2012.04 (TQ BSP 0101) to 2013.12 (TQ BSP 0109).
Normally I cherry-pick rule upgrades rather than doing full ptxdist upgrade, since it's easier to maintain auto build servers, if they only need to do a source checkout.
We don't see any noticeable app start improvements. But disabling prelink result in a significant lower product production time.

/Bruno
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