diff options
| -rwxr-xr-x | scripts/xz_wrap.sh | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/scripts/xz_wrap.sh b/scripts/xz_wrap.sh index bb760b721b2c..c8c36441ab70 100755 --- a/scripts/xz_wrap.sh +++ b/scripts/xz_wrap.sh @@ -16,4 +16,15 @@ case $SRCARCH in sparc) BCJ=--sparc ;; esac -exec $XZ --check=crc32 $BCJ --lzma2=$LZMA2OPTS,dict=32MiB +# Use single-threaded mode because it compresses a little better +# (and uses less RAM) than multithreaded mode. +# +# For the best compression, the dictionary size shouldn't be +# smaller than the uncompressed kernel. 128 MiB dictionary +# needs less than 1400 MiB of RAM in single-threaded mode. +# +# On the archs that use this script to compress the kernel, +# decompression in the preboot code is done in single-call mode. +# Thus the dictionary size doesn't affect the memory requirements +# of the preboot decompressor at all. +exec $XZ --check=crc32 --threads=1 $BCJ --lzma2=$LZMA2OPTS,dict=128MiB |