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Date: Tue, 13 Sep 2016 11:27:55 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Sepherosa Ziehau <sephe@freebsd.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: Re: svn commit: r305722 - head/sys/x86/x86
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On Tue, Sep 13, 2016 at 09:21:25AM +0800, Sepherosa Ziehau wrote:
> Still didn't find anything wrong with this tunable set.
Hm, did you have DMAR globally enabled ?  I.e. did you get messages
about dmar attachment, and then reports about dmar routing interrupts, like
msi: Assigning MSI-X IRQ 264 to local APIC 4 vector 51
dmar1: programming irte[5] rid 0xf078 high 0x4f078 low 0x400330001
?

Ok, I tested this on my box.  Indeed, this mutex (now sx) seems to not
participate there.  Thanks.