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Date:      Sun, 8 Jan 2012 17:41:12 +0100
From:      Yamagi Burmeister <lists@yamagi.org>
To:        kostikbel@gmail.com
Cc:        amd64@freebsd.org, arch@freebsd.org, sparc64@freebsd.org
Subject:   Re: AVX
Message-ID:  <20120108174112.50e030ba.lists@yamagi.org>
In-Reply-To: <20120102063700.GF50300@deviant.kiev.zoral.com.ua>
References:  <20111226220756.GR50300@deviant.kiev.zoral.com.ua> <20120102063700.GF50300@deviant.kiev.zoral.com.ua>

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Hi,
I've tested your patch on a Core2Duo with XSAVE but (of course) without
AVX on 10-CURRENT as of today (r229812):

CPU: Intel(R) Core(TM)2 Duo CPU     T6670  @ 2.20GHz (2194.55-MHz
K8-class CPU) Origin =3D "GenuineIntel"  Id =3D 0x1067a  Family =3D 6  Model
  =3D 17  Stepping =3D 10
Features=3D0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,
  MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=3D0x408e3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,
  PDCM,SSE4.1,XSAVE>
AMD Features=3D0x20100800<SYSCALL,NX,LM> AMD Features2=3D0x1<LAHF>=20

Everything's fine:
- System is booting without a problem
- All applications are working
- AVX applications are still failing with SIGILL

But there's one problem: While a shutdown (shutdown -p now) is always
successfull a reboot (shutdown -r now) and suspend (zzz) are resulting=20
in a double panic. The first panic is a "Fatal trap 9: general
protection fault while in kernel mode" on "cpuid =3D 1; apic id =3D 01".
The process is always "idle: cpu1".

The second panic is also "Fatal trap 9: general protection fault while
in kernel mode" but with "cpuid =3D 0; apic id =3D 00". The process is
always "init".=20

Since it's a dual core cpu, one panic for each processor core?=20

I'm unable to get a core dump and ddb is unresponsive to any keyboard
input. A serial console is unavailable, since it's a laptop...
Nevertheless I've uploaded screenshots of both panics to:
=20
 http://deponie.yamagi.org/freebsd/debug/avx=20


On Mon, 2 Jan 2012 08:37:00 +0200
Kostik Belousov <kostikbel@gmail.com> wrote:

> The patch
> http://people.freebsd.org/~kib/misc/avx.2.patch
> is the commit candidate. Compared with avx.1.patch, it includes
> several bugfixes, some move of code around, and finishes the
> implementation of getcontextx(3) for non-x86 architectures.
>=20
> Please note that variant of getcontextx() is required for deferred
> signal delivery from libthr. This is the reason for Cc:ing sparc64@,
> could somebody test the patch on this architecture ? I used the
> http://people.freebsd.org/~kib/misc/defer_sig.c to test deferred
> delivery on amd64.
>=20
> Another missed testing point is machines capable of XSAVE but lacking
> AVX extensions. I think most Core2 fall into this category, but my Core2
> machine is disassembled. Could anybody test the patch on non-SandyBridge
> machine having XSAVE support ? You can check the capability using
> ports/sysutils/x86info or looking at the early boot Features2 line,
> which shall contain the XSAVE.


--=20
Homepage:  www.yamagi.org
XMPP:      yamagi@yamagi.org
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