[DragonFlyBSD - Bug #2697] (New) i386 MP locks up during boot after MI interrupts, TSC related?

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #2697 has been reported by davshao.

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Bug #2697: i386 MP locks up during boot after MI interrupts, TSC related?
http://bugs.dragonflybsd.org/issues/2697

* Author: davshao
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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On three systems running i386 3.9-DEVELOPMENT with either multiple cores or with hyperthreading, following

commit 1a1ada88346625b2b581e0676eea4df99f1b89b6
Date:   Sun Jul 6 12:49:22 2014 -0700

    boot - Fix timecount issues with some BIOSes

(haven't completely bisected, might be the previous commit)
booting freezes some time after

Initialize MI interrupts

For example on an Intel Atom:

Initialize MI interrupts
objcache: magazine cap [13, 141]
Finish MP startup
Active CPU Mask: 00000003

On a Asrock Z77M (Intel i3):

Initialize MI interrupts
objcache: magazine cap [13, 141]
Finish MP startup
Active CPU Mask: 0000000f
TSC testing MP synchronization
TSC is MP synchronized, after 57322 tries

On the other hand, the problem does not manifest on a true single processor i386 Pentium 4 machine.










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