我优化yum的知识，主要来源于以下2篇链接文章：
http://www.linuxsir.org/bbs/showthread.php?t=290570
http://www.linuxsir.org/bbs/showthread. ... light=axel
感谢wq1977、感谢亚森罗平、以及所有帖子里、帖子外出现的朋友。
我这篇的东西只是整理粘贴一下。要深入理解的同学，请详细看上面链接文章。
小提示：
1、axel是wq1977大侠开发的，国货哦。
2、另有shawn.p.huang大侠开发了一款中文输入法，目前在快速完善升级中，现已率先加入Fedora官方源，详情看这里：
http://www.linuxsir.org/bbs/thread320543.html
3、Fedora 9 将通过yum-presto插件实现差量下载，也就是说只下载旧包与新包的差异部分。效率几乎提升10倍。
以Fedora 8 、axel 1.0b 为例，以root权限操作，开始。
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一、安装yum-fastestmirror
二、安装axelyum install yum-fastestmirror
注：我目前遇到的bug是假如yum要下载10个文件，第6个就中止了，那么再运行yum命令时，需要10个都重新下载。但这时我会在axelget.conf中把enabled值修改临时禁用，免得重复劳动。
1、获得axelget.conf
2、获得axelget.pycd /etc/yum/pluginconf.d/
wget http://wininlinux.googlepages.com/axelget.conf
3、获得axel源码和安装。cd /usr/lib/yum-plugins/
wget http://wininlinux.googlepages.com/axelget.py
三、优化fedora.repo与fedora-updates.repo文件cd /usr/local/src
wget http://wilmer.gaast.net/downloads/axel-1.0b.tar.gz
tar zxvf axel-1.0b.tar.gz
cd axel-1.0b
./configure --i18n=1
make
make install
官方的镜像列表
http://mirrors.fedoraproject.org/publiclist/Fedora/
优化前请做好备份。
亚森罗平兄的fedora.repo文件的头一段：tar jcvf MyReposBak.tar.bz2 /etc/yum.repo.d/
chmod 444 MyReposBak.tar.bz2
代码： 全选
[fedora]
name=Fedora $releasever - $basearch
failovermethod=priority
#baseurl=http://download.fedora.redhat.com/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
baseurl=
http://download.fedora.redhat.com/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirrors.usc.edu/pub/linux/distributions/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirrors.cat.pdx.edu/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://ftp.iij.ad.jp/pub/linux/fedora/releases/$releasever/Everything/$basearch/os/
ftp://ftp.iij.ad.jp/pub/linux/fedora/releases/$releasever/Everything/$basearch/os/
http://mirror.aarnet.edu.au/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirror.internode.on.net/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://gulus.usherbrooke.ca/pub/distro/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirror.karneval.cz/pub/linux/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://sunsite.mff.cuni.cz/MIRRORS/fedora.redhat.com/linux/releases/$releasever/Everything/$basearch/os/
http://ftp-stud.hs-esslingen.de/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://fedora.tu-chemnitz.de/pub/linux/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirror.fraunhofer.de/download.fedora.redhat.com/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://ftp.uni-bayreuth.de/linux/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://ftp.funet.fi/pub/mirrors/fedora.redhat.com/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
ftp://ftp.free.fr/mirrors/fedora.redhat.com/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://limestone.uoregon.edu/ftp/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://fedora.mirror.iweb.ca/releases/$releasever/Everything/$basearch/os/
ftp://ftp.cse.buffalo.edu/pub/Linux/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirror.cc.vt.edu/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirrors.tummy.com/pub/fedora.redhat.com/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirrors.kernel.org/fedora/releases/$releasever/Everything/$basearch/os/
http://www.gtlib.gatech.edu/pub/fedora.redhat/linux/releases/$releasever/Everything/$basearch/os/
http://ftp.linux.ncsu.edu/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://ftp.iij.ad.jp/pub/linux/fedora/releases/$releasever/Everything/$basearch/os/
ftp://ftp.iij.ad.jp/pub/linux/fedora/releases/$releasever/Everything/$basearch/os/
http://ftp.yz.yamagata-u.ac.jp/pub/linux/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://ftp.rhnet.is/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirror.pacific.net.au/linux/fedora/linux/releases/$releasever/Everything/$basearch/os/
#mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-$releasever&arch=$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY
代码： 全选
[updates]
name=Fedora $releasever - $basearch - Updates
failovermethod=priority
baseurl=
http://download.fedora.redhat.com/pub/fedora/linux/updates/$releasever/$basearch/
http://mirrors.usc.edu/pub/linux/distributions/fedora/linux/updates/$releasever/$basearch/
http://mirrors.cat.pdx.edu/fedora/linux/updates/$releasever/$basearch/
http://ftp.iij.ad.jp/pub/linux/fedora/updates/$releasever/$basearch/
ftp://ftp.iij.ad.jp/pub/linux/fedora/updates/$releasever/$basearch/
http://mirror.aarnet.edu.au/pub/fedora/linux/updates/$releasever/$basearch/
http://mirror.internode.on.net/pub/fedora/linux/updates/$releasever/$basearch/
http://gulus.usherbrooke.ca/pub/distro/fedora/linux/updates/$releasever/$basearch/
http://mirror.karneval.cz/pub/linux/fedora/linux/updates/$releasever/$basearch/
http://sunsite.mff.cuni.cz/MIRRORS/fedora.redhat.com/linux/updates/$releasever/$basearch/
http://ftp-stud.hs-esslingen.de/pub/fedora/linux/updates/$releasever/$basearch/
http://fedora.tu-chemnitz.de/pub/linux/fedora/linux/updates/$releasever/$basearch/
http://mirror.fraunhofer.de/download.fedora.redhat.com/fedora/linux/updates/$releasever/$basearch/
http://ftp.uni-bayreuth.de/linux/fedora/linux/updates/$releasever/$basearch/
http://ftp.funet.fi/pub/mirrors/fedora.redhat.com/pub/fedora/linux/updates/$releasever/$basearch/
ftp://ftp.free.fr/mirrors/fedora.redhat.com/fedora/linux/updates/$releasever/$basearch/
http://limestone.uoregon.edu/ftp/fedora/linux/updates/$releasever/$basearch/
http://fedora.mirror.iweb.ca/updates/$releasever/$basearch/
ftp://ftp.cse.buffalo.edu/pub/Linux/fedora/linux/updates/$releasever/$basearch/
http://mirror.cc.vt.edu/pub/fedora/linux/updates/$releasever/$basearch/
http://mirrors.tummy.com/pub/fedora.redhat.com/fedora/linux/updates/$releasever/$basearch/
http://mirrors.kernel.org/fedora/updates/$releasever/$basearch/
http://www.gtlib.gatech.edu/pub/fedora.redhat/linux/updates/$releasever/$basearch/
http://ftp.linux.ncsu.edu/pub/fedora/linux/updates/$releasever/$basearch/
http://ftp.iij.ad.jp/pub/linux/fedora/updates/$releasever/$basearch/
ftp://ftp.iij.ad.jp/pub/linux/fedora/updates/$releasever/$basearch/
http://ftp.yz.yamagata-u.ac.jp/pub/linux/fedora/linux/updates/$releasever/$basearch/
http://ftp.rhnet.is/pub/fedora/linux/updates/$releasever/$basearch/
http://mirror.pacific.net.au/linux/fedora/linux/updates/$releasever/$basearch/
#mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=updates-released-f$releasever&arch=$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora
优化的方法是一个个域名ping，把最快的镜像放在上面。我优化后的（公网ADSL2M）平时可达80～130KB/s，快的时候可以达峰值180～210KB/s。根据使用经验，澳大利亚的源最稳定，但负担重，同步较慢；台湾省opensource.nchc.org.tw的源是ping不通的，但firefox打开速度却最快。一般以下3个源比较快，如果想临时禁用某个源可以在repo文件中前面加“#”号。
mirror.pacific.net.au
opensource.nchc.org.tw
ftp.iij.ad.jp
我的fedora.repo文件
代码： 全选
[fedora]
name=Fedora $releasever - $basearch
failovermethod=priority
baseurl=
http://ftp.iij.ad.jp/pub/linux/fedora/releases/$releasever/Everything/$basearch/os/
http://mirror.pacific.net.au/linux/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://opensource.nchc.org.tw/fedora/linux/releases/$releasever/Everything/$basearch/os/
http://mirrors.kernel.org/fedora/releases/$releasever/Everything/$basearch/os/
http://download.fedora.redhat.com/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
#mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-$releasever&arch=$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY
[fedora-debuginfo]
name=Fedora $releasever - $basearch - Debug
failovermethod=priority
baseurl=
http://ftp.iij.ad.jp/pub/linux/fedora/releases/$releasever/Everything/$basearch/debug/
http://mirror.pacific.net.au/linux/fedora/linux/releases/$releasever/Everything/$basearch/debug/
http://opensource.nchc.org.tw/fedora/linux/releases/$releasever/Everything/$basearch/debug/
http://mirrors.kernel.org/fedora/releases/$releasever/Everything/$basearch/debug/
http://download.fedora.redhat.com/pub/fedora/linux/releases/$releasever/Everything/$basearch/debug/
#mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-debug-$releasever&arch=$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY
[fedora-source]
name=Fedora $releasever - Source
failovermethod=priority
baseurl=
http://ftp.iij.ad.jp/pub/linux/fedora/releases/$releasever/Everything/source/SRPMS/
http://mirror.pacific.net.au/linux/fedora/linux/releases/$releasever/Everything/source/SRPMS/
http://opensource.nchc.org.tw/fedora/linux/releases/$releasever/Everything/source/SRPMS/
http://mirrors.kernel.org/fedora/releases/$releasever/Everything/source/SRPMS/
http://download.fedora.redhat.com/pub/fedora/linux/releases/$releasever/Everything/source/SRPMS/
#mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-source-$releasever&arch=$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY
代码： 全选
[updates]
name=Fedora $releasever - $basearch - Updates
failovermethod=priority
baseurl=
http://ftp.iij.ad.jp/pub/linux/fedora/updates/$releasever/$basearch/
http://mirror.pacific.net.au/linux/fedora/linux/updates/$releasever/$basearch/
http://opensource.nchc.org.tw/fedora/linux/updates/$releasever/$basearch/
http://mirrors.kernel.org/fedora/updates/$releasever/$basearch/
http://download.fedora.redhat.com/pub/fedora/linux/updates/$releasever/$basearch/
#mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=updates-released-f$releasever&arch=$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora
[updates-debuginfo]
name=Fedora $releasever - $basearch - Updates - Debug
failovermethod=priority
baseurl=
http://ftp.iij.ad.jp/pub/linux/fedora/updates/$releasever/$basearch/debug/
http://mirror.pacific.net.au/linux/fedora/linux/updates/$releasever/$basearch/debug/
http://opensource.nchc.org.tw/fedora/linux/updates/$releasever/$basearch/debug/
http://mirrors.kernel.org/fedora/updates/$releasever/$basearch/debug/
http://download.fedora.redhat.com/pub/fedora/linux/updates/$releasever/$basearch/debug/
#mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=updates-released-debug-f$releasever&arch=$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora
[updates-source]
name=Fedora $releasever - Updates Source
failovermethod=priority
baseurl=
http://ftp.iij.ad.jp/pub/linux/fedora/updates/$releasever/SRPMS/
http://mirror.pacific.net.au/linux/fedora/linux/updates/$releasever/SRPMS/
http://opensource.nchc.org.tw/fedora/linux/updates/$releasever/SRPMS/
http://mirrors.kernel.org/fedora/updates/$releasever/SRPMS/
http://download.fedora.redhat.com/pub/fedora/linux/updates/$releasever/SRPMS/
#mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=updates-released-source-f$releasever&arch=$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora
当你明白个中方法之后，还可以优化fedora-development.repo、fedora-updates-testing.repo等等。
如果当中有什么错误请指出，如果你悟出有什么更好的东西，请你于大家分享，谢谢。