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Makefile: use smaller dictionary size for xz module compression

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By default, xz without parameters uses a dictionary size of 8 MB.
However, most modules are much smaller than that.
The xz manpage states that 'increasing dictionary size usually improves
compression ratio, but a dictionary bigger than the uncompressed file
is waste of memory'.
Use a dictionary size of 2 MB for module compression, resulting in
slightly higher compression speed while still maintaining a good
compression ratio.

Signed-off-by: Tor Vic <torvic9@mailbox.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Tor Vic 2020-12-16 13:58:02 +01:00 committed by Masahiro Yamada
parent fa1e160b08
commit db4632c65e
1 changed files with 1 additions and 1 deletions
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Makefile
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@ -1053,7 +1053,7 @@ ifdef CONFIG_MODULE_COMPRESS
mod_compress_cmd = $(KGZIP) -n -f mod_compress_cmd = $(KGZIP) -n -f
endif # CONFIG_MODULE_COMPRESS_GZIP endif # CONFIG_MODULE_COMPRESS_GZIP
ifdef CONFIG_MODULE_COMPRESS_XZ ifdef CONFIG_MODULE_COMPRESS_XZ
mod_compress_cmd = $(XZ) -f mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f
endif # CONFIG_MODULE_COMPRESS_XZ endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd export mod_compress_cmd