Search

7.144. microcode_ctl

download PDF
Updated microcode_ctl packages that fix a bug and add various enhancements are now available for Red Hat Enterprise Linux 6.
The microcode_ctl packages provide utility code and microcode data to assist the kernel in updating the CPU microcode at system boot time. This microcode supports all current x86-based, Intel 64-based, and AMD64-based CPU models. It takes advantage of the mechanism built-in to Linux that allows microcode to be updated after system boot. When loaded, the updated microcode corrects the behavior of various processors, as described in processor specification updates issued by Intel and AMD for those processors.

Bug Fix

BZ#740932
Previously, a udev rule in /lib/udev/rules.d/89-microcode.rules allowed the module to load more than once. On very large systems (for example, systems with 2048 or more CPUs), this could result in the system becoming unresponsive on boot. With this update, the udev rule has been changed to ensure the module loads only once. Very large systems now boot as expected.

Enhancements

BZ#818096
The Intel CPU microcode file has been updated to version 20120606.
BZ#867078
The AMD CPU microcode file has been updated to version 20120910.
All users of microcode_ctl are advised to upgrade to these updated packages, which fix this bug and add these enhancements. Note: a system reboot is necessary for this update to take effect.
Red Hat logoGithubRedditYoutubeTwitter

Learn

Try, buy, & sell

Communities

About Red Hat Documentation

We help Red Hat users innovate and achieve their goals with our products and services with content they can trust.

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. For more details, see the Red Hat Blog.

About Red Hat

We deliver hardened solutions that make it easier for enterprises to work across platforms and environments, from the core datacenter to the network edge.

© 2024 Red Hat, Inc.