https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Mon, 06 Apr 2026 21:42:54 +0000 Tue, 11 Jul 2017 13:57:56 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=5547 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=5547&PID=32522&title=where-is-x2apic#32522 Author: wardog
Subject: 5547
Posted: 11 Jul 2017 at 1:57pm

untoreh wrote: Just to be clear x2apic is actually not present in the cpu flags

Intel is famous for disabling functions on the K processors so that comes as no surprise sorry to say.
]]> Tue, 11 Jul 2017 13:57:56 +0000 https://forum.asrock.com/forum_posts.asp?TID=5547&PID=32522&title=where-is-x2apic#32522 https://forum.asrock.com/forum_posts.asp?TID=5547&PID=32519&title=where-is-x2apic#32519 Author: untoreh
Subject: 5547
Posted: 11 Jul 2017 at 12:45pm

Hello, I am running linux on an asrock z87 fatality killer with an intel haswell 4770k. But the x2apic extension doesn't seem to be enabled.
I can only run virt with westmere arch because of this so I would appreciate if someone explains to me why the extension is off.
I have read there could possibly be a switch in the bios to toggle it but I couldn't find any, I am running the latest bios that can be downloaded from asrock website.
I also tried the kernel boot parameter

intremap=no_x2apic_optout

which supposedly makes linux override the off switch from the bios but still no success.
Just to be clear x2apic is actually not present in the cpu flags

cat /proc/cpuinfo | grep x2apic

returns nothing.
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