2016/5/18のCentOS6.7のyum-cron後、httpsの速度が約10ms速くなりました。
Opensslのアップデートが原因の可能性が高いのですが、脆弱性修正しか行われていないはずですし他にもアップデートされたものが多すぎて根本原因は不明です。
2016/5/18のyum-cronでアップデートされたものリスト
kernel-devel-2.6.32-642.el6.x86_64 kernel-2.6.32-642.el6.x86_64 xorg-x11-drv-ati-firmware-7.6.1-2.el6.noarch libdrm-2.4.65-2.el6.x86_64 openssl-1.0.1e-48.el6_8.1.x86_64 system-config-network-tui-1.6.0.el6.3-4.el6.noarch systemtap-client-2.9-4.el6.x86_64 1:mod_ssl-2.2.15-53.el6.centos.x86_64 abrt-addon-python-2.0.8-40.el6.centos.x86_64 openssh-5.3p1-118.1.el6_8.x86_64 gmp-4.3.1-10.el6.x86_64 1:make-3.81-23.el6.x86_64 coreutils-8.4-43.el6.x86_64 libxcb-1.11-2.el6.x86_64 abrt-cli-2.0.8-40.el6.centos.x86_64 openssh-clients-5.3p1-118.1.el6_8.x86_64 32:bind-libs-9.8.2-0.47.rc1.el6.x86_64 libXext-1.3.3-1.el6.x86_64 file-5.04-30.el6.x86_64 crda-3.13_2015.10.22-3.el6.x86_64 iputils-20071127-21.el6.x86_64 openssl-1.0.1e-48.el6_8.1.i686 iw-4.1-1.el6.x86_64 krb5-libs-1.10.3-57.el6.x86_64 libreport-python-2.0.9-32.el6.centos.x86_64 device-mapper-persistent-data-0.6.2-0.1.rc7.el6.x86_64 audit-2.4.5-3.el6.x86_64 elfutils-0.164-2.el6.x86_64 libreport-compat-2.0.9-32.el6.centos.x86_64 device-mapper-multipath-libs-0.4.9-93.el6.x86_64 ntsysv-1.3.49.5-1.el6.x86_64 udev-147-2.73.el6.x86_64 iproute-2.6.32-54.el6.x86_64 policycoreutils-2.0.83-29.el6.x86_64 2:shadow-utils-4.1.5.1-5.el6.x86_64 libgcj-4.4.7-17.el6.x86_64 libreport-plugin-logger-2.0.9-32.el6.centos.x86_64 yum-plugin-security-1.1.30-37.el6.noarch tcp_wrappers-libs-7.6-58.el6.x86_64 cscope-15.6-7.el6.x86_64 mysql-server-5.1.73-7.el6.x86_64 gdb-7.2-90.el6.x86_64 elfutils-libs-0.164-2.el6.x86_64 policycoreutils-python-2.0.83-29.el6.x86_64 libselinux-2.0.94-7.el6.i686 libXft-2.3.2-1.el6.x86_64 libreport-plugin-mailx-2.0.9-32.el6.centos.x86_64 initscripts-9.03.53-1.el6.centos.x86_64 perl-Net-SSLeay-1.35-10.el6.x86_64 libgomp-4.4.7-17.el6.x86_64 abrt-tui-2.0.8-40.el6.centos.x86_64 file-libs-5.04-30.el6.x86_64 perl-libwww-perl-5.833-3.el6.noarch yum-cron-3.2.29-73.el6.centos.noarch mdadm-3.3.4-1.el6.x86_64 glibc-headers-2.12-1.192.el6.x86_64 ntpdate-4.2.6p5-10.el6.centos.x86_64 mysql-libs-5.1.73-7.el6.x86_64 httpd-2.2.15-53.el6.centos.x86_64 krb5-libs-1.10.3-57.el6.i686 cpp-4.4.7-17.el6.x86_64 glibc-2.12-1.192.el6.i686 sos-3.2-40.el6.centos.noarch util-linux-ng-2.17.2-12.24.el6.x86_64 libxml2-python-2.7.6-21.el6.x86_64 abrt-libs-2.0.8-40.el6.centos.x86_64 libstdc++-4.4.7-17.el6.x86_64 glibc-common-2.12-1.192.el6.x86_64 libreport-cli-2.0.9-32.el6.centos.x86_64 libXrandr-1.4.2-1.el6.x86_64 systemtap-runtime-2.9-4.el6.x86_64 fuse-2.8.3-5.el6.x86_64 gtk2-2.24.23-8.el6.x86_64 libusb1-1.0.9-0.7.rc1.el6.x86_64 pixman-0.32.8-1.el6.x86_64 libX11-common-1.6.3-2.el6.noarch dracut-kernel-004-409.el6_8.2.noarch 1:dmidecode-2.12-7.el6.x86_64 glibc-devel-2.12-1.192.el6.x86_64 libreport-plugin-reportuploader-2.0.9-32.el6.centos.x86_64 man-pages-overrides-6.8.2-1.el6.noarch 32:bind-utils-9.8.2-0.47.rc1.el6.x86_64 pam-1.1.1-22.el6.x86_64 hwdata-0.233-16.1.el6.noarch procps-3.2.8-36.el6.x86_64 sg3_utils-libs-1.28-12.el6.x86_64 libblkid-2.17.2-12.24.el6.x86_64 tcp_wrappers-7.6-58.el6.x86_64 device-mapper-multipath-0.4.9-93.el6.x86_64 libselinux-2.0.94-7.el6.x86_64 chkconfig-1.3.49.5-1.el6.x86_64 1:microcode_ctl-1.17-21.el6.x86_64 elfutils-libelf-0.164-2.el6.x86_64 2:tar-1.23-14.el6.x86_64 curl-7.19.7-52.el6.x86_64 libselinux-python-2.0.94-7.el6.x86_64 tcsh-6.17-35.el6.x86_64 abrt-addon-kerneloops-2.0.8-40.el6.centos.x86_64 libreport-2.0.9-32.el6.centos.x86_64 12:dhcp-common-4.1.1-51.P1.el6.centos.x86_64 sysstat-9.0.4-31.el6.x86_64 rpm-python-4.8.0-55.el6.x86_64 lvm2-libs-2.02.143-7.el6.x86_64 kpartx-0.4.9-93.el6.x86_64 binutils-2.20.51.0.2-5.44.el6.x86_64 device-mapper-1.02.117-7.el6.x86_64 rpm-libs-4.8.0-55.el6.x86_64 gdbm-devel-1.8.0-39.el6.x86_64 rpm-4.8.0-55.el6.x86_64 libreport-plugin-kerneloops-2.0.9-32.el6.centos.x86_64 libcurl-7.19.7-52.el6.x86_64 screen-4.0.3-19.el6.x86_64 libxml2-2.7.6-21.el6.x86_64 gcc-4.4.7-17.el6.x86_64 2:irqbalance-1.0.7-8.el6.x86_64 libgcc-4.4.7-17.el6.x86_64 libXrender-0.9.8-2.1.el6_8.1.x86_64 libselinux-utils-2.0.94-7.el6.x86_64 gdbm-1.8.0-39.el6.i686 upstart-0.6.5-16.el6.x86_64 mysql-5.1.73-7.el6.x86_64 libreport-plugin-rhtsupport-2.0.9-32.el6.centos.x86_64 kernel-firmware-2.6.32-642.el6.noarch device-mapper-libs-1.02.117-7.el6.x86_64 ntp-4.2.6p5-10.el6.centos.x86_64 abrt-addon-ccpp-2.0.8-40.el6.centos.x86_64 kexec-tools-2.0.0-300.el6.x86_64 systemtap-2.9-4.el6.x86_64 libreport-plugin-ureport-2.0.9-32.el6.centos.x86_64 nss-3.21.0-8.el6.x86_64 httpd-tools-2.2.15-53.el6.centos.x86_64 libXi-1.7.4-1.el6.x86_64 xfsprogs-3.1.1-19.el6.x86_64 systemtap-devel-2.9-4.el6.x86_64 alsa-utils-1.1.0-8.el6.x86_64 audit-libs-2.4.5-3.el6.x86_64 openldap-2.4.40-12.el6.x86_64 dracut-004-409.el6_8.2.noarch 12:dhclient-4.1.1-51.P1.el6.centos.x86_64 redhat-rpm-config-9.0.3-51.el6.centos.noarch yum-utils-1.1.30-37.el6.noarch libreport-filesystem-2.0.9-32.el6.centos.x86_64 abrt-python-2.0.8-40.el6.centos.x86_64 iscsi-initiator-utils-6.2.0.873-21.el6.x86_64 openssh-server-5.3p1-118.1.el6_8.x86_64 libpciaccess-0.13.4-1.el6.x86_64 device-mapper-event-libs-1.02.117-7.el6.x86_64 libudev-147-2.73.el6.x86_64 usbutils-003-6.el6.x86_64 tuned-0.2.19-16.el6.noarch selinux-policy-targeted-3.7.19-292.el6.noarch bash-4.1.2-40.el6.x86_64 libuuid-2.17.2-12.24.el6.x86_64 glib2-2.28.8-5.el6.x86_64 biosdevname-0.7.1-3.el6.x86_64 lvm2-2.02.143-7.el6.x86_64 1:cups-libs-1.4.2-74.el6.x86_64 nss-sysinit-3.21.0-8.el6.x86_64 tmpwatch-2.9.16-6.el6.x86_64 audit-libs-python-2.4.5-3.el6.x86_64 coreutils-libs-8.4-43.el6.x86_64 kernel-headers-2.6.32-642.el6.x86_64 yum-plugin-fastestmirror-1.1.30-37.el6.noarch nss-util-3.21.0-2.el6.x86_64 sudo-1.8.6p3-24.el6.x86_64 14:tcpdump-4.0.0-9.20090921gitdf3cb4.2.el6.x86_64 nspr-4.11.0-1.el6.x86_64 python-pycurl-7.19.0-9.el6.x86_64 glibc-2.12-1.192.el6.x86_64 abrt-2.0.8-40.el6.centos.x86_64 nss-tools-3.21.0-8.el6.x86_64 rpm-build-4.8.0-55.el6.x86_64 blktrace-1.0.1-7.el6.x86_64 gdbm-1.8.0-39.el6.x86_64 device-mapper-event-1.02.117-7.el6.x86_64 selinux-policy-3.7.19-292.el6.noarch freetype-2.3.11-17.el6.x86_64 postgresql-libs-8.4.20-6.el6.x86_64 libX11-1.6.3-2.el6.x86_64 alsa-lib-1.1.0-4.el6.x86_64
