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List:       openembedded-core
Subject:    [OE-core] [PATCH 02/11] qemux86-64: build for x86-64-v3 (2013 Haswell and later) rather than Core 2 
From:       "Alexander Kanavin" <alex.kanavin () gmail ! com>
Date:       2022-12-30 18:38:41
Message-ID: 20221230183850.3089510-2-alex () linutronix ! de
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This allows us to
- test those more recent instruction sets (AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT, \
                MOVBE, XSAVE)
- benefit from improved performance across the stack both in kvm-driven system \
emulation and when running on real silicon.
For example, glibc:
https://www.phoronix.com/news/Glibc-strcasecmp-AVX2-EVEX

v4 level is adding AVX-512, which is far less established, particularly Intel has \
famously backtracked from supporting it in Alder Lake/Raport Lake client CPUs and AMD \
has only implemented it in very recent Zen4 products: \
https://www.phoronix.com/news/GCC-11-x86-64-Feature-Levels

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
---
 meta/conf/machine/include/x86/qemuboot-x86.inc | 4 ++--
 meta/conf/machine/qemux86-64.conf              | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/meta/conf/machine/include/x86/qemuboot-x86.inc \
b/meta/conf/machine/include/x86/qemuboot-x86.inc index 3953679366..31db1b2a61 100644
--- a/meta/conf/machine/include/x86/qemuboot-x86.inc
+++ b/meta/conf/machine/include/x86/qemuboot-x86.inc
@@ -4,8 +4,8 @@ QB_SMP = "-smp 4"
 QB_CPU:x86 = "-cpu IvyBridge -machine q35,i8042=off"
 QB_CPU_KVM:x86 = "-cpu IvyBridge -machine q35,i8042=off"
 
-QB_CPU:x86-64 = "-cpu IvyBridge -machine q35,i8042=off"
-QB_CPU_KVM:x86-64 = "-cpu IvyBridge -machine q35,i8042=off"
+QB_CPU:x86-64 = "-cpu Skylake-Client -machine q35,i8042=off"
+QB_CPU_KVM:x86-64 = "-cpu Skylake-Client -machine q35,i8042=off"
 
 QB_AUDIO_DRV = "alsa"
 QB_AUDIO_OPT = "-device AC97"
diff --git a/meta/conf/machine/qemux86-64.conf b/meta/conf/machine/qemux86-64.conf
index 8640867911..d355375f13 100644
--- a/meta/conf/machine/qemux86-64.conf
+++ b/meta/conf/machine/qemux86-64.conf
@@ -9,8 +9,8 @@ PREFERRED_PROVIDER_virtual/libgles2 ?= "mesa"
 PREFERRED_PROVIDER_virtual/libgles3 ?= "mesa"
 
 require conf/machine/include/qemu.inc
-DEFAULTTUNE ?= "core2-64"
-require conf/machine/include/x86/tune-corei7.inc
+DEFAULTTUNE ?= "x86-64-v3"
+require conf/machine/include/x86/tune-x86-64-v3.inc
 require conf/machine/include/x86/qemuboot-x86.inc
 
 UBOOT_MACHINE ?= "qemu-x86_64_defconfig"
-- 
2.30.2



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