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Thu, 15 Jun 2017 16:17:28 +0000 To: "Burton, Ross" References: <1493752813-18913-1-git-send-email-mkelly@xevo.com> From: Martin Kelly Message-ID: <2607b2d4-c37f-5693-1002-db17f9e1024d@xevo.com> Date: Thu, 15 Jun 2017 09:17:20 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: X-Originating-IP: [67.171.33.217] X-ClientProxiedBy: BN6PR13CA0007.namprd13.prod.outlook.com (10.175.123.17) To BN6PR0101MB2929.prod.exchangelabs.com (10.174.87.138) X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN6PR0101MB2929: X-MS-Office365-Filtering-Correlation-Id: fbdfb33a-d8ef-417a-f7f7-08d4b40a053e X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(22001)(201703131423075)(201703031133081); SRVR:BN6PR0101MB2929; X-Microsoft-Exchange-Diagnostics: 1; BN6PR0101MB2929; 3:bs0aFOye5LC9eEJ9qGUQTaOVOZxKEq/IWP02VBRep63S5UlYiMZijf3Y8vIfcF8ePxBZ7xjHykxc9n1HYoAhQb4HKCAW5hTrNEPIZNaNdkK3Ax/4suam1Cr7LWAuw9Q2UlO2HwdfdC5y3rfG+aahtd410MqPWbad2zsQSFJsOlEv0AzeWbZFUcmBXzIQwjSxGzOVW+X1hmXOuGQmkHXTozfJwzzY1frKa4FP1tQjfPnCqVOEAlWu/Lcu3HaS1BTE3+dATWXHmGvAGHpAPYa8L4FNgFImzLOhH9SrWhbA5flZJHM5x7dDDzJakavdOEwj0CnzYxGykKUVxvYZMPvK8Q==; 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charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit On 06/15/2017 04:45 AM, Burton, Ross wrote: > > On 2 May 2017 at 20:20, Martin Kelly > wrote: > > -QB_CPU_KVM_x86-64 = "-cpu kvm64" > +QB_CPU_KVM_x86-64 = "-cpu core2duo" > > > What's the actual meaning of the "kvm64" and "kvm32" CPUs? Is there a > performance hit? Should we be instead changing the qemu machine to > target a different instruction set? > I am no expert, but running qemu -cpu help just says: kvm32 - "Common 32-bit KVM processor" kvm64 - "Common 64-bit KVM processor" My best guess is that, running on qemu without kvm, both cases will be slow (since it's all software emulation). But, using qemu -kvm, it should be fast as long as you run on a native CPU that is core2duo or better, as the native instructions can just be exposed and passed through to the host. Since core2duo is very old by now, it should be fast for virtually everyone building on x86. Regardless, the core issue here is not performance but merely making sure that binaries run without crashing in the emulated environment. We need to upgrade the emulation to match the binaries or downgrade the binaries to match the emulation (aka building against something even more ancient than core2duo). Further downgrading the CPU seems wrong to me because core2duo is already quite old.