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Date:      Mon, 07 Aug 2017 22:11:33 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 219399] System panics after several hours of 14-threads-compilation orgies using poudriere on AMD Ryzen...
Message-ID:  <bug-219399-8-DG24M07yP1@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-219399-8@https.bugs.freebsd.org/bugzilla/>
References:  <bug-219399-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219399

--- Comment #214 from Don Lewis <truckman@FreeBSD.org> ---
I'm not familiar enough with the Linux memory map to comment, but I haven't
seen any reports of hang/reboot problems that sound like what what we ran i=
nto.
 There have been reports of idle machines having problems that seem to be
resolved by avoiding the deep Cx states.  I don't know if that is a potenti=
al
problem for us since our default seems to be:
  hw.acpi.cpu.cx_lowest: C1

It would be nice if the "safe area" was documented.  This doesn't appear to=
 be
an issue with Intel CPUs.  My AMD FX-8320E is happy with the pre-Ryzen loca=
tion
of our signal trampoline code.  I haven't run my test program on it because=
 I'm
keeping it busy doing the port builds that I'd hoped to be doing on my new
Ryzen box.

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