{"id":457,"date":"2013-04-24T12:04:19","date_gmt":"2013-04-24T10:04:19","guid":{"rendered":"http:\/\/songoku.homelinux.com\/wordpress\/?p=457"},"modified":"2013-04-24T12:04:19","modified_gmt":"2013-04-24T10:04:19","slug":"recompile-x86_64-kernel-for-centos-6-4","status":"publish","type":"post","link":"https:\/\/ndk.sytes.net\/wordpress\/?p=457","title":{"rendered":"Recompile x86_64 kernel for CentOS 6.4"},"content":{"rendered":"

\n\tHi, due to some changes in the official CentOS 6 kernel like the integration of IPMI into the kernel (boot hanging bug) and the preemptive scheduling to "desktop" instead of "server" (which resulted in poorer performance) i decided to recompile the kernel.\n<\/p>\n

\n\tHere is a small howto if you want to recompile your centos stock kernel with other options:\n<\/p>\n

    \n
  1. \n\t\tcreate building tree as non-root user<\/strong>
    \n\t\t# su <user>
    \n\t\t# mkdir -p ~\/rpmbuild\/{BUILD,BUILDROOT,RPMS,SOURCES,SPECS,SRPMS}<\/em>
    \n\t\t# echo '%_topdir %(echo $HOME)\/rpmbuild' > ~\/.rpmmacros<\/em>
    \n\t\t# exit<\/em> <\/user><\/em>\n\t<\/li>\n
  2. \n\t\tinstall needed packages:<\/strong>
    \n\t\t# yum groupinstall "Development Tools"
    \n\t\t# yum install hmaccalc zlib-devel binutils-devel elfutils-libelf-devel
    \n\t\t# yum install rpm-build redhat-rpm-config asciidoc hmaccalc
    \n\t\t# yum install binutils-devel elfutils-libelf-devel newt-devel zlib-devel ncurses-devel
    \n\t\t# yum install xmlto python-devel<\/em> <\/em>\n\t<\/li>\n
  3. \n\t\tchange user (NEVER RECOMPILE AS ROOT):<\/strong>
    \n\t\t# su <user><\/em> <\/em>\n\t<\/li>\n
  4. \n\t\tinstall source rpm:<\/strong>
    \n\t\t# rpm -ivh http:\/\/vault.centos.org\/6.4\/updates\/Source\/SPackages\/kernel-2.6.32-358.2.1.el6.src.rpm
    \n\t\t\u200b<\/em>(6.4 -> centos version, kernel-2.6.32-358.2.1.el6.src.rpm -> kernel version)<\/em>\n\t<\/li>\n
  5. \n\t\tprepare source build tree<\/strong>
    \n\t\t# cd ~\/rpmbuild\/SPECS
    \n\t\t# rpmbuild -bp –target="x86_64" kernel.spec<\/em>\n\t<\/li>\n
  6. \n\t\tedit rpmbuild\/SPECS\/kernel.spec and replace line 18 with your custom build id:<\/strong>
    \n\t\t# %define buildid .custom.NOIPMI.SERVER
    \n\t\t(-> kernel-2.6.32.358.2.1.custom.NOIPMI.SERVER.x86_64.rpm) <\/em>\n\t<\/li>\n
  7. \n\t\tcopy over old kernel config:<\/strong>
    \n\t\t# cd ~\/rpmbuild\/BUILD\/kernel-2.6.32-358.2.1.el6\/linux-2.6.32-358.2.1.el6.x86_64<\/em>
    \n\t\t# cp \/boot\/config-2.6.32-358.2.1.el6.x86_64 .config<\/em>\n\t<\/li>\n
  8. \n\t\tnow chane the kernel config to your desires:<\/strong>
    \n\t\t# make clean
    \n\t\t# make menuconfig<\/em>\n\t<\/li>\n
  9. \n\t\tthen copy the config file to your SOURCE directory:<\/strong>
    \n\t\t# cp .config configs\/kernel-2.6.32-x86_64.config
    \n\t\t# cp configs\/* ~\/rpmbuild\/SOURCES<\/em>\n\t<\/li>\n
  10. \n\t\tlaunch the compile process:<\/strong>
    \n\t\t# cd ~\/rpmbuild\/SPECS<\/em>
    \n\t\t# rpmbuild -bb –with baseonly –without debug –without debuginfo –target="x86_64" kernel.specs<\/em>\n\t<\/li>\n<\/ol>\n

    \n\t\u200bNow there should be some cryptic output to the screen. Lean back and have a coffee, the compilation process can take some time. Depending on your hardware this can take between 30 min and 3 hours (apparemtly up to 9 hours on a PentiumIII).\n<\/p>\n

    \n\tThe compiled kernel can be found in the RPMS folder.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Hi, due to some changes in the official CentOS 6 kernel like the integration of IPMI into the kernel (boot hanging bug) and the preemptive scheduling to "desktop" instead of "server" (which resulted in poorer performance) i decided to recompile the kernel. Here is a small howto if you want to recompile your centos stock kernel […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,7],"tags":[],"class_list":["post-457","post","type-post","status-publish","format-standard","hentry","category-linuxunix","category-servers"],"_links":{"self":[{"href":"https:\/\/ndk.sytes.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/457","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ndk.sytes.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ndk.sytes.net\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ndk.sytes.net\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ndk.sytes.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=457"}],"version-history":[{"count":0,"href":"https:\/\/ndk.sytes.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/457\/revisions"}],"wp:attachment":[{"href":"https:\/\/ndk.sytes.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ndk.sytes.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ndk.sytes.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}