Date: Mon, 30 Mar 2015 20:14:21 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 197756] System stops booting with "ACPI APIC Table: <SECCSD LH43STAR>" Message-ID: <bug-197756-8-sOMw25z0KS@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-197756-8@https.bugs.freebsd.org/bugzilla/> References: <bug-197756-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197756 --- Comment #9 from commit-hook@freebsd.org --- A commit references this bug: Author: jhb Date: Mon Mar 30 20:13:24 UTC 2015 New revision: 280866 URL: https://svnweb.freebsd.org/changeset/base/280866 Log: Wait 100 microseconds for a local APIC to dispatch each startup-related IPI rather than 20. The MP 1.4 specification states in Appendix B.2: "A period of 20 microseconds should be sufficient for IPI dispatch to complete under normal operating conditions". (Note that this appears to be separate from the 10 millisecond (INIT) and 200 microsecond (STARTUP) waits after the IPIs are dispatched.) The Intel SDM is silent on this issue as far as I can tell. At least some hardware requires 60 microseconds as noted in the PR, so bump this to 100 to be on the safe side. PR: 197756 Reported by: zaphod@berentweb.com MFC after: 1 week Changes: head/sys/amd64/amd64/mp_machdep.c head/sys/i386/i386/mp_machdep.c -- You are receiving this mail because: You are the assignee for the bug.
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