{"id":3141,"date":"2021-03-25T21:19:39","date_gmt":"2021-03-25T12:19:39","guid":{"rendered":"http:\/\/matoken.org\/blog\/?p=3141"},"modified":"2021-03-25T21:41:18","modified_gmt":"2021-03-25T12:41:18","slug":"change-the-linux-kernel-initramfs-compression-format-on-debian","status":"publish","type":"post","link":"https:\/\/matoken.org\/blog\/2021\/03\/25\/change-the-linux-kernel-initramfs-compression-format-on-debian\/","title":{"rendered":"Debian \u3067 Linux Kernel \u306e initramfs \u306e\u5727\u7e2e\u5f62\u5f0f\u3092\u5909\u66f4\u3059\u308b&#x1f427;&#x1f5dc;&#xfe0f;"},"content":{"rendered":"<div id=\"preamble\">\n<div class=\"sectionbody\">\n<div class=\"paragraph\">\n<p>\u5148\u65e5\u300c<a href=\"https:\/\/matoken.org\/blog\/2021\/03\/23\/build-linux-kernel-5-11-on-debian-sid\/\">Debian sid\u3067Linux Kernel(5.11)\u3092build\u3059\u308b\u30e1\u30e2 <\/a>\u300d\u3092\u66f8\u3044\u305f\u306e\u3067\u3059\u304c\uff0cTwitter\u3067<a href=\"https:\/\/twitter.com\/henrich\">@henrich<\/a>\u3055\u3093\u304b\u3089\u3053\u3093\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\uff0e<\/p>\n<blockquote class=\"twitter-tweet\" data-partner=\"tweetdeck\">\n<p lang=\"ja\" dir=\"ltr\">\/boot\u306e\u5bb9\u91cf\u306e\u305f\u3081\u306b\u306finitramfs\u306e\u5727\u7e2e\u3092gzip\u304b\u3089xz\u3084zstd\u306b\u3059\u308b\u306e\u3082\u3042\u308a\u3067\u3059\u306d<\/p>\n<p>\u2014 henrich (@henrich) <a href=\"https:\/\/twitter.com\/henrich\/status\/1374350916933935110?ref_src=twsrc%5Etfw\">March 23, 2021<\/a><\/p><\/blockquote>\n<p><script async=\"\" src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<\/div>\n<div class=\"paragraph\">\n<p>\u305d\u3046\u3044\u3048\u3070\u5727\u7e2e\u5f62\u5f0f\u8272\u3005\u3042\u3063\u305f\u306a\u3068\u8a66\u3057\u3066\u307f\u307e\u3057\u305f\uff0e<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"sect1\">\n<h2 id=\"_\u73fe\u5728\u306e\u5727\u7e2e\u5f62\u5f0f\u3092\u78ba\u8a8d\u3059\u308b\">\u73fe\u5728\u306e\u5727\u7e2e\u5f62\u5f0f\u3092\u78ba\u8a8d\u3059\u308b<\/h2>\n<div class=\"sectionbody\">\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ grep COMPRESS \/etc\/initramfs-tools\/initramfs.conf\n# COMPRESS: [ gzip | bzip2 | lz4 | lzma | lzop | xz | zstd ]\nCOMPRESS=gzip<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ file --mime-type \/boot\/initrd.img-`uname -r`\n\/boot\/initrd.img-5.11.8+: application\/gzip<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p>\u8a2d\u5b9a\u306f <code>gzip<\/code> \u3067\uff0c\u5b9f\u969b\u306e\u30d5\u30a1\u30a4\u30eb\u3082gzip\u306b\u306a\u3063\u3066\u3044\u307e\u3059\uff0e<br \/>\n\u5727\u7e2e\u5f62\u5f0f\u306f <code>gzip<\/code> \u4ee5\u5916\u306b <code>bzip2, lz4, lzma, lzop, xz, zstd<\/code> \u304c\u9078\u3079\u308b\u3088\u3046\u3067\u3059\uff0e<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"sect1\">\n<h2 id=\"_\u5727\u7e2e\u5f62\u5f0f\u306e\u6bd4\u8f03\">\u5727\u7e2e\u5f62\u5f0f\u306e\u6bd4\u8f03<\/h2>\n<div class=\"sectionbody\">\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ ls -1sS --block-size=1 .\/initrd.img-5.11.8+.*\n183033856 .\/initrd.img-5.11.8+.raw\n 81076224 .\/initrd.img-5.11.8+.lz4\n 78315520 .\/initrd.img-5.11.8+.lzop\n 54329344 .\/initrd.img-5.11.8+.gzip\n 51761152 .\/initrd.img-5.11.8+.zstd\n 50081792 .\/initrd.img-5.11.8+.bz2\n 36548608 .\/initrd.img-5.11.8+.xz\n 36540416 .\/initrd.img-5.11.8+.lzma<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p>\u5bb9\u91cf\u304c\u3069\u306e\u304f\u3089\u3044\u306b\u306a\u308b\u306e\u304b\u5404\u30a2\u30fc\u30ab\u30a4\u30d0\u3067\u5727\u7e2e\u3057\u3066\u307f\u307e\u3057\u305f\uff0e<\/p>\n<\/div>\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ \\time -f %e cat .\/initrd.img-5.11.8+.raw &gt; \/dev\/null\n0.03\n$ \\time -f %e lz4cat .\/initrd.img-5.11.8+.lz4 &gt; \/dev\/null\n0.38\n$ \\time -f %e lzop -d -c .\/initrd.img-5.11.8+.lzop &gt; \/dev\/null\n0.42\n$ \\time -f %e zstdcat .\/initrd.img-5.11.8+.zstd &gt; \/dev\/null\n0.44\n$ \\time -f %e zcat .\/initrd.img-5.11.8+.gzip &gt; \/dev\/null\n1.38\n$ \\time -f %e lzma -d -c .\/initrd.img-5.11.8+.lzma &gt; \/dev\/null\n3.22\n$ \\time -f %e xzcat .\/initrd.img-5.11.8+.xz &gt; \/dev\/null\n3.37\n$ \\time -f %e bzcat .\/initrd.img-5.11.8+.bz2 &gt; \/dev\/null\n9.39<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p>\u5c55\u958b\u6642\u9593\u3082\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u305f\uff0e<\/p>\n<\/div>\n<table  class=\"tableblock frame-all grid-all stretch table table-hover\" >\n<colgroup>\n<col style=\"width: 33.3333%;\"\/>\n<col style=\"width: 33.3333%;\"\/>\n<col style=\"width: 33.3334%;\"\/>\n<\/colgroup>\n<thead>\n<tr>\n<th class=\"tableblock halign-left valign-top\">\u5727\u7e2e\u5f62\u5f0f<\/th>\n<th class=\"tableblock halign-left valign-top\">\u5727\u7e2e\u30c7\u30fc\u30bf\u91cf(byte)<\/th>\n<th class=\"tableblock halign-left valign-top\">\u5c55\u958b\u6642\u9593(\u79d2)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">raw<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">183033856<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">0.03<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">lz4<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">81076224<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">0.38<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">lzop<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">78315520<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">0.43<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">gzip<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">54329344<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">1.38<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">zstd<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">51761152<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">0.44<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">bzip2<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">50081792<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">9.39<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">xz<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">36548608<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">3.37<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">lzma<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">36540416<\/p>\n<\/td>\n<td class=\"tableblock halign-left valign-top\">\n<p class=\"tableblock\">3.22<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"paragraph\">\n<p>\u5727\u7e2e\u30c7\u30fc\u30bf\u306e\u5727\u7e2e\u7387\u306a\u3069\u306f\u65e2\u5b9a\u5024\u306e\u307e\u307e\u3067\uff0c\u5c55\u958b\u6642\u9593\u306f <code>\\time -f %e zcat .\/initrd.img-5.11.8+.gzip &gt; \/dev\/null<\/code> \u82e5\u3057\u304f\u306f <code>\\time -f %e lzma -d -c .\/initrd.img-5.11.8+.lzma &gt; \/dev\/null<\/code> \u306e\u3088\u3046\u306b\u3057\u3066\u6e2c\u308a\u307e\u3057\u305f\uff0e<\/p>\n<\/div>\n<div class=\"paragraph\">\n<p>\u30b5\u30a4\u30ba\u3067\u306f raw &gt; lz4 \u2252 lzop &gt; gzip \u2252 zstd \u2252 bz2 &gt; xz \u2252 lzma \u306a\u611f\u3058\u3067\uff0c<br \/>\n\u5c55\u958b\u901f\u5ea6\u306f bz2 &gt; xz \u2252 lzma &gt; gzip &gt; zstd \u2252 lzop \u2252 lz4 &gt; raw \u306a\u611f\u3058\u3067\u3059\uff0e<\/p>\n<\/div>\n<div class=\"admonitionblock caution\">\n<table  class=\" table table-hover\" >\n<tbody>\n<tr>\n<td class=\"icon\">\n<div class=\"title\">Caution<\/div>\n<\/td>\n<td class=\"content\">\n\u6642\u9593\u306b\u3064\u3044\u3066\u306f\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u74b0\u5883\u3067\u8272\u3005\u52d5\u3044\u3066\u3044\u308b\u72b6\u614b\u30671\u56de\u3057\u304b\u6e2c\u3063\u3066\u3044\u306a\u3044\u306e\u3067\u76ee\u5b89\u7a0b\u5ea6\u306b\u3057\u3066\u304f\u3060\u3055\u3044\uff0e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"admonitionblock caution\">\n<table  class=\" table table-hover\" >\n<tbody>\n<tr>\n<td class=\"icon\">\n<div class=\"title\">Caution<\/div>\n<\/td>\n<td class=\"content\">\n\u3053\u3053\u3067\u306f\u65e2\u5b9a\u5024\u3067\u5727\u7e2e\u3057\u307e\u3057\u305f\u304c\uff0czstd, lz4, xz\u306b\u3064\u3044\u3066\u306finitramfs\u4f5c\u6210\u6642\u306b\u5727\u7e2e\u30aa\u30d7\u30b7\u30e7\u30f3\u306a\u3069\u304c\u65e2\u5b9a\u5024\u3068\u9055\u3046\u3088\u3046\u306a\u306e\u3067\u76ee\u5b89\u7a0b\u5ea6\u306b\u3057\u3066\u304f\u3060\u3055\u3044\uff0e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"paragraph\">\n<p>\u5bb9\u91cf\u7684\u306b\u306fxz, lzma\u304c\u826f\u3055\u305d\u3046\u3067\u3059\u304c\u5c55\u958b\u6642\u9593\u304c\u3068\u3066\u3082\u5897\u3048\u305d\u3046\u3067\u3059\uff0ezstd\u306fgzip\u3088\u308a\u901f\u304f\u3066\u5c0f\u3055\u304f\u306a\u3063\u3066\u826f\u3055\u305d\u3046\u3067\u3059\uff0e<br \/>\n\u3068\u3044\u3046\u3053\u3068\u3067zstd\u306b\u3057\u3066\u307f\u307e\u3059\uff0e<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"sect1\">\n<h2 id=\"_initramfs\u3092_zstd_\u3067\u4f5c\u308a\u76f4\u3059\">initramfs\u3092 zstd \u3067\u4f5c\u308a\u76f4\u3059<\/h2>\n<div class=\"sectionbody\">\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ sudo git -C \/etc diff HEAD \/etc\/initramfs-tools\/initramfs.conf\ndiff --git a\/initramfs-tools\/initramfs.conf b\/initramfs-tools\/initramfs.conf\nindex 01bdd85..a0c051b 100644\n--- a\/initramfs-tools\/initramfs.conf\n+++ b\/initramfs-tools\/initramfs.conf\n@@ -41,7 +41,7 @@ KEYMAP=n\n # COMPRESS: [ gzip | bzip2 | lz4 | lzma | lzop | xz | zstd ]\n #\n\n-COMPRESS=gzip\n+COMPRESS=zstd\n\n #\n # DEVICE: ...<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p><code>\/etc\/initramfs-tools\/initramfs.conf<\/code> \u3092\u7de8\u96c6\u3057\u3066\uff0c <code>COMPRESS<\/code> \u3092 <code>zstd<\/code> \u306b\u5909\u66f4\u3057\u307e\u3059\uff0e<\/p>\n<\/div>\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ update-initramfs -h\n\nUsage: update-initramfs {-c|-d|-u} [-k version] [-v] [-b directory]\n\nOptions:\n -k version     Specify kernel version or 'all'\n -c             Create a new initramfs\n -u             Update an existing initramfs\n -d             Remove an existing initramfs\n -b directory   Set alternate boot directory\n -v             Be verbose\n\nSee update-initramfs(8) for further details.\n\n$ sudo update-initramfs -k `uname -r` -u -v<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p><code>update-initramfs<\/code> \u3067\u66f4\u65b0\u3092\u884c\u3044\u307e\u3059\uff0e<\/p>\n<\/div>\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ ls -s --block-size=1 \/boot\/initrd.img-5.11.8+\n54542336 \/boot\/initrd.img-5.11.8+\n$ ls -s --block-size=1 \/boot\/initrd.img-5.11.8+\n41611264 \/boot\/initrd.img-5.11.8+\n$ file --mime-type \/boot\/initrd.img-5.11.8+\n\/boot\/initrd.img-5.11.8+: application\/zstd\n$ zstd -lv \/boot\/initrd.img-5.11.8+\n*** zstd command line interface 64-bits v1.4.8, by Yann Collet ***\n\/boot\/initrd.img-5.11.8+\n# Zstandard Frames: 1\nWindow Size: 8.00 MB (8388608 B)\nCompressed Size: 39.53 MB (41446437 B)\nDecompressed Size: 174.55 MB (183032320 B)\nRatio: 4.4161\nCheck: XXH64<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p>\u51fa\u6765\u4e0a\u304c\u3063\u305f\u30d5\u30a1\u30a4\u30eb\u3092\u78ba\u8a8d\u3059\u308b\u3068 <code>zstd<\/code> \u306b\u306a\u3063\u3066\u3044\u307e\u3057\u305f\uff0e<br \/>\n\u518d\u8d77\u52d5\u3057\u3066\u3082\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f :)<br \/>\n\u4e0a\u3067\u78ba\u8a8d\u3057\u305f\u5bb9\u91cf\u3088\u308a\u5927\u5206\u5c0f\u3055\u5538\u3063\u3066\u3044\u308b\u306e\u306f\u5727\u7e2e\u30ec\u30d9\u30eb\u306e\u5dee\u3067\u3057\u3087\u3046\u304b?<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"sect1\">\n<h2 id=\"_initramfs\u5727\u7e2e\u30ec\u30d9\u30eb\u306e\u78ba\u8a8d\">initramfs\u5727\u7e2e\u30ec\u30d9\u30eb\u306e\u78ba\u8a8d<\/h2>\n<div class=\"sectionbody\">\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ grep zstd \/usr\/sbin\/mkinitramfs\nzstd)   compress=\"zstd -q -19 -T0\" ;;<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p><code>update-initramfs<\/code> \u304b\u3089\u547c\u3070\u308c\u308b <code>mkinitramfs<\/code> \u3092\u78ba\u8a8d\u3059\u308b\u3068zstd\u306e\u5727\u7e2e\u30ec\u30d9\u30eb\u30aa\u30d7\u30b7\u30e7\u30f3\u306f <code>-19<\/code> \u3067\u6700\u9ad8\u5727\u7e2e\u7387\u3067\u3057\u305f\uff0e(\u65e2\u5b9a\u5024\u306f <code>-3<\/code> )<\/p>\n<\/div>\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ \\time -f%e zstdcat -T1 \/boot\/initrd.img-5.11.8+ &gt; \/dev\/null\n0.50<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p>\u305d\u306e\u5206\u5c55\u958b\u6642\u9593\u3082\u5c11\u3057\u4f38\u3073\u3066\u3044\u305d\u3046\u3067\u3059\uff0e<\/p>\n<\/div>\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">case \"${compress}\" in\ngzip)   # If we're doing a reproducible build, use gzip -n\n        if [ -n \"${SOURCE_DATE_EPOCH}\" ]; then\n                compress=\"gzip -n\"\n        # Otherwise, substitute pigz if it's available\n        elif command -v pigz &gt;\/dev\/null; then\n                compress=pigz\n        fi\n        ;;\nlz4)    compress=\"lz4 -9 -l\" ;;\nzstd)   compress=\"zstd -q -19 -T0\" ;;\nxz)     compress=\"xz --check=crc32\"\n        # If we're not doing a reproducible build, enable multithreading\n        test -z \"${SOURCE_DATE_EPOCH}\" &amp;&amp; compress=\"$compress --threads=0\"\n        ;;\nbzip2|lzma|lzop)\n        # no parameters needed\n        ;;\n*)      echo \"W: Unknown compression command ${compress}\" &gt;&amp;2 ;;\nesac<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p>\u5468\u308a\u3092\u898b\u3066\u307f\u308b\u3068\uff0c <code>lz4<\/code> \u306f <code>-9<\/code> \u3067\u6700\u9ad8( <code>-12<\/code> )\u3067\u306f\u306a\u3044\u3051\u3069\u65e2\u5b9a\u5024( <code>1<\/code> )\u3088\u308a\u5727\u7e2e\u7387\u3092\u9ad8\u304f\u3057\u3066\u3042\u308a\u307e\u3059\uff0exz\u306b\u306f\u6574\u5408\u6027\u30c1\u30a7\u30c3\u30af\u304c\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u3042\u308b\u3051\u3069\u5bb9\u91cf\u306b\u306f\u3042\u307e\u308a\u95a2\u4fc2\u306a\u3044\u304b\u306a?<br \/>\n\u305d\u306e\u4ed6\u306f\u65e2\u5b9a\u5024\u306e\u3088\u3046\u3067\u3059\uff0e<\/p>\n<\/div>\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ count=1;while [[ $count -lt 19 ]];do zstdcat \/boot\/initrd.img-5.11.8+ | zstd -T0 -$count -c - &gt; \/tmp\/zstd-$count.zstd;count=$(( $count+1 ));done\n$ ls -1sS --block-size=1 \/tmp\/zstd-*\n56188928 \/tmp\/zstd-1.zstd\n53272576 \/tmp\/zstd-2.zstd\n51761152 \/tmp\/zstd-3.zstd\n51466240 \/tmp\/zstd-4.zstd\n50061312 \/tmp\/zstd-5.zstd\n49614848 \/tmp\/zstd-6.zstd\n47431680 \/tmp\/zstd-7.zstd\n46690304 \/tmp\/zstd-8.zstd\n46424064 \/tmp\/zstd-9.zstd\n45973504 \/tmp\/zstd-10.zstd\n45850624 \/tmp\/zstd-11.zstd\n45686784 \/tmp\/zstd-12.zstd\n45539328 \/tmp\/zstd-13.zstd\n45371392 \/tmp\/zstd-14.zstd\n45309952 \/tmp\/zstd-15.zstd\n44093440 \/tmp\/zstd-16.zstd\n42987520 \/tmp\/zstd-17.zstd\n41705472 \/tmp\/zstd-18.zstd\n41447424 \/tmp\/zstd-19.zstd\n$ ls -1S \/tmp\/zstd-* | xargs -I{} -n1 sh -c \"echo -n \\\"{} \\\"; \\time -f%e zstdcat -T0 {} &gt; \/dev\/null\"\n\/tmp\/zstd-1.zstd 0.37\n\/tmp\/zstd-2.zstd 0.36\n\/tmp\/zstd-3.zstd 0.40\n\/tmp\/zstd-4.zstd 0.47\n\/tmp\/zstd-5.zstd 0.44\n\/tmp\/zstd-6.zstd 0.42\n\/tmp\/zstd-7.zstd 0.40\n\/tmp\/zstd-8.zstd 0.37\n\/tmp\/zstd-9.zstd 0.35\n\/tmp\/zstd-10.zstd 0.40\n\/tmp\/zstd-11.zstd 0.41\n\/tmp\/zstd-12.zstd 0.38\n\/tmp\/zstd-13.zstd 0.39\n\/tmp\/zstd-14.zstd 0.39\n\/tmp\/zstd-15.zstd 0.43\n\/tmp\/zstd-16.zstd 0.37\n\/tmp\/zstd-17.zstd 0.42\n\/tmp\/zstd-18.zstd 0.53\n\/tmp\/zstd-19.zstd 0.68<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p>\u5727\u7e2e\u30ec\u30d9\u30eb\u3054\u3068\u306e\u5bb9\u91cf\u3068\u5c55\u958b\u6642\u9593\u306f\u3053\u3093\u306a\u611f\u3058\u306b\u306a\u308a\u307e\u3057\u305f\uff0e\u8272\u3005\u52d5\u3044\u3066\u3044\u308b\u74b0\u5883\u306a\u306e\u3067\u304a\u304b\u3057\u305d\u3046\u306a\u3068\u3053\u308d\u304c\u3042\u308a\u307e\u3059\u304c\u5927\u4f53\u306e\u76ee\u5b89\u3068\u3057\u3066\uff0e<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"sect1\">\n<h2 id=\"_kernel_build\u6642\u306e\u52d5\u4f5c\">Kernel build\u6642\u306e\u52d5\u4f5c<\/h2>\n<div class=\"sectionbody\">\n<div class=\"paragraph\">\n<p>Kernel 5.11.9 \u304c\u6765\u3066\u3044\u305f\u306e\u3067\u30d3\u30eb\u30c9\u3057\u3066\u307f\u307e\u3057\u305f\uff0e<\/p>\n<\/div>\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ wget https:\/\/cdn.kernel.org\/pub\/linux\/kernel\/v5.x\/incr\/patch-5.11.8-9.xz\n$ cd linux-5.11\n$ xzcat ..\/patch-5.11.8-9.xz | patch -p1\n$ grep ^COMPRESS= \/etc\/initramfs-tools\/initramfs.conf\nCOMPRESS=zstd\n$ time make -j`nproc` bindeb-pkg\n$ ls -1sS ..\/*5.11.9*\n737300 ..\/linux-image-5.11.9+-dbg_5.11.9+-5_amd64.deb\n 59584 ..\/linux-image-5.11.9+_5.11.9+-5_amd64.deb\n  8040 ..\/linux-headers-5.11.9+_5.11.9+-5_amd64.deb\n  1124 ..\/linux-libc-dev_5.11.9+-5_amd64.deb\n     8 ..\/linux-5.11.9+_5.11.9+-5_amd64.buildinfo\n     4 ..\/linux-5.11.9+_5.11.9+-5_amd64.changes\n$ sudo apt install ..\/linux-image-5.11.9+_5.11.9+-5_amd64.deb ..\/linux-headers-5.11.9+_5.11.9+-5_amd64.deb ..\/linux\n-libc-dev_5.11.9+-5_amd64.deb\n$ file \/boot\/initrd.img-5.11.9+\n\/boot\/initrd.img-5.11.9+: Zstandard compressed data (v0.8+), Dictionary ID: None\n$ ls --block-size=1 -s \/boot\/initrd.img-5.11.9+\n41602048 \/boot\/initrd.img-5.11.9+\n$ sudo shutdown -r now 'kernel upgrade'<\/code><\/pre>\n<\/div>\n<\/div>\n<div class=\"paragraph\">\n<p>\u554f\u984c\u306a\u304f zstd \u306b\u306a\u308a\u307e\u3057\u305f\uff0e<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"sect1\">\n<h2 id=\"_\u53c2\u8003url\">\u53c2\u8003URL<\/h2>\n<div class=\"sectionbody\">\n<div class=\"paragraph\">\n<p>Debian\u306einitramfs\u306e\u5727\u7e2e\u5f62\u5f0f\u3092zstd\u306b\u3057\u3088\u3046\u3068\u3044\u3046\u30d0\u30b0\u30ec\u30dd\u30fc\u30c8\uff0ebullseye\u306f\u30d5\u30ea\u30fc\u30ba\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u5165\u3089\u306a\u3044\uff0e<\/p>\n<\/div>\n<div class=\"ulist\">\n<ul>\n<li><a href=\"https:\/\/bugs.debian.org\/cgi-bin\/bugreport.cgi?bug=976054\">#976054 &#8211; initramfs-tools: [RFC] Compress initramfs file with zstd &#8211; Debian Bug report logs<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"sect1\">\n<h2 id=\"_\u74b0\u5883\">\u74b0\u5883<\/h2>\n<div class=\"sectionbody\">\n<div class=\"listingblock\">\n<div class=\"content\">\n<pre class=\"highlight\"><code class=\"language-shell\" data-lang=\"shell\">$ dpkg-query -W initramfs-tools-core zstd\ninitramfs-tools-core    0.140\nzstd    1.4.8+dfsg-2.1\n$ lsb_release -dr\nDescription:    Debian GNU\/Linux bullseye\/sid\nRelease:        unstable\n$ uname -srm\nLinux 5.11.9+ x86_64<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5148\u65e5\u300cDebian sid\u3067Linux Kernel(5.11)\u3092build\u3059\u308b\u30e1\u30e2 \u300d\u3092\u66f8\u3044\u305f\u306e\u3067\u3059\u304c\uff0cTwitter\u3067@henrich\u3055\u3093\u304b\u3089\u3053\u3093\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\uff0e \/boot\u306e\u5bb9\u91cf\u306e\u305f\u3081\u306b\u306finitramfs\u306e\u5727\u7e2e\u3092 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"webmentions_disabled_pings":false,"webmentions_disabled":false,"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[7,6,199],"tags":[627,599,275,607],"class_list":["post-3141","post","type-post","status-publish","format-standard","hentry","category-debian-linux","category-linux","category-sid","tag-initramfs","tag-kernel","tag-linux","tag-zstd"],"_links":{"self":[{"href":"https:\/\/matoken.org\/blog\/wp-json\/wp\/v2\/posts\/3141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/matoken.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/matoken.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/matoken.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/matoken.org\/blog\/wp-json\/wp\/v2\/comments?post=3141"}],"version-history":[{"count":0,"href":"https:\/\/matoken.org\/blog\/wp-json\/wp\/v2\/posts\/3141\/revisions"}],"wp:attachment":[{"href":"https:\/\/matoken.org\/blog\/wp-json\/wp\/v2\/media?parent=3141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/matoken.org\/blog\/wp-json\/wp\/v2\/categories?post=3141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/matoken.org\/blog\/wp-json\/wp\/v2\/tags?post=3141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}