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mkimage-profiles
Commit 8d160698 authored by Michael Shigorin's avatar Michael Shigorin
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stage2: squashfs blocksize tweaks

Looks like the 128k default block size is pretty well chosen: it saves ~6% of image size compared to 64k, and subsequent differences are ~3% per doubling the block size up to 1M (thanks led@ for carrying out the tests). So we'll stick with 256k for "normal" xz compression (inodes uncompressed) and get 512k back for "tight" one (compressed). The runtime performance issues are to be examined yet when bootchart or the like is deployed, nothing drastic though. With "fast" (gzip/lzo) squash compression inodes go unmolested. For the record, tight live-webkiosk builds as 95M image in 3:40, and tight live-flightgear.iso builds as 669M image in 6:34. Nice. There's no much sense going for 1M block size: e.g. live-webkiosk would drop to 93M (3:46) but its load time would increase up to 2:07 as compared to 1:48 for -b 524288 and 1:42 for -b 262144 -noI on a Duron 500/512M system given the very same DVD+RW media.
parent 931d23e8
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Showing with 25 additions and 18 deletions
features.in/stage2/stage1/scripts.d/03-test-kernel
View file @ 8d160698
......@@ -3,9 +3,9 @@
# check relevant kernel features availability
CONFIGS=/boot/config-*
GZ_OPTS="-comp gzip"
XZ_OPTS="-comp xz -b 262144 -noI"
LZO_OPTS="-comp lzo"
GZ_OPTS="-comp gzip -noI"
XZ_OPTS="-comp xz"
LZO_OPTS="-comp lzo -noI"
verbose() { [ -n "$GLOBAL_VERBOSE" ] && echo "** $@" >&2; }
fatal() { echo "** error: $@" >&2; exit 1; }
......@@ -30,19 +30,26 @@ done
verbose "GLOBAL_SQUASHFS: $GLOBAL_SQUASHFS"
# squashfs options: not really neccessary but better than none
# NB: this config file should be carried over into install2
if [ "$GLOBAL_SQUASHFS" != "fast" ] && configured "SQUASHFS_XZ=y"; then
# NB: the decompression filter overhead might hurt
# NB: there are arm, powerpc and some other filters too
if [ "$GLOBAL_SQUASHFS" = "tight" ] && configured "X86"; then
XZ_OPTS="$XZ_OPTS -Xbcj x86"
fi
echo "PACK_SQUASHFS_OPTS=$XZ_OPTS"
else # go fast, or even faster if possible
if configured "SQUASHFS_LZO=y"; then
echo "PACK_SQUASHFS_OPTS=$LZO_OPTS"
else # safe default
echo "PACK_SQUASHFS_OPTS=$GZ_OPTS"
options()
{
# squashfs options: not really neccessary but better than none
# NB: this config file should be carried over into install2
if [ "$GLOBAL_SQUASHFS" != "fast" ] && configured "SQUASHFS_XZ=y"; then
# NB: the decompression filter overhead might hurt
# NB: there are arm, powerpc and some other filters too
if [ "$GLOBAL_SQUASHFS" = "tight" ] && configured "X86"; then
XZ_OPTS="$XZ_OPTS -b 524288 -Xbcj x86"
else
XZ_OPTS="$XZ_OPTS -b 262144 -noI"
fi
echo "$XZ_OPTS"
else # go fast, or even faster if possible
if configured "SQUASHFS_LZO=y"; then
echo "$LZO_OPTS"
else # safe default
echo "$GZ_OPTS"
fi
fi
fi > /.image/squashcfg.mk
}
echo "PACK_SQUASHFS_OPTS=-no-recovery `options`" > /.image/squashcfg.mk
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