[OE-core] [PATCH] Set XZ_COMPRESSION_LEVEL to -9

[Khem Raj]

On Fri, Apr 12, 2019 at 2:09 PM Adrian Bunk <bunk at stusta.de> wrote:
>
> It is consistent with other compressors also using their
> best compression.
>
> xz is currently the option that offers best compression,
> using settings even lower than the default is surprising
> and makes it harder to choose the best available compression.
>
> For anyone who cares about compression time using a different
> option like gzip or bzip2 is the logical choice.
>
> For decompression, better compressed is actually faster
> to decompress.

I worry about resources we need to spend when creating these archives.
Can you post some comparisons
along to assess the performance.

>
> Signed-off-by: Adrian Bunk <bunk at stusta.de>
> ---
>  meta/classes/image_types.bbclass | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
> index 95aa1674cf..1c44ec4a80 100644
> --- a/meta/classes/image_types.bbclass
> +++ b/meta/classes/image_types.bbclass
> @@ -54,7 +54,7 @@ def imagetypes_getdepends(d):
>      # Sort the set so that ordering is consistant
>      return " ".join(sorted(deps))
>
> -XZ_COMPRESSION_LEVEL ?= "-3"
> +XZ_COMPRESSION_LEVEL ?= "-9"
>  XZ_INTEGRITY_CHECK ?= "crc32"
>
>  ZIP_COMPRESSION_LEVEL ?= "-9"
> --
> 2.17.1
>
> --
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