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Diffstat (limited to 'results/classifier/deepseek-2-tmp/output/hypervisor/1788665')
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diff --git a/results/classifier/deepseek-2-tmp/output/hypervisor/1788665 b/results/classifier/deepseek-2-tmp/output/hypervisor/1788665 new file mode 100644 index 000000000..62890e335 --- /dev/null +++ b/results/classifier/deepseek-2-tmp/output/hypervisor/1788665 @@ -0,0 +1,43 @@ + +Low 2D graphics performance with Windows 10 (1803) VGA passthrough VM using "Spectre" protection + +Windows 10 (1803) VM using VGA passthrough via qemu script. + +After upgrading Windows 10 Pro VM to version 1803, or possibly after applying the March/April security updates from Microsoft, the VM would show low 2D graphics performance (sluggishness in 2D applications and low Passmark results). + +Turning off Spectre vulnerability protection in Windows remedies the issue. + +Expected behavior: +qemu/kvm hypervisor to expose firmware capabilities of host to guest OS - see https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/CVE-2017-5715-and-hyper-v-vms + +Background: + +Starting in March or April Microsoft began to push driver updates in their updates / security updates. See https://support.microsoft.com/en-us/help/4073757/protect-your-windows-devices-against-spectre-meltdown + +One update concerns the Intel microcode - see https://support.microsoft.com/en-us/help/4100347. It is activated by default within Windows. + +Once the updates are applied within the Windows guest, 2D graphics performance drops significantly. Other performance benchmarks are not affected. + +A bare metal Windows installation does not display a performance loss after the update. See https://heiko-sieger.info/low-2d-graphics-benchmark-with-windows-10-1803-kvm-vm/ + +Similar reports can be found here: +https://www.reddit.com/r/VFIO/comments/97unx4/passmark_lousy_2d_graphics_performance_on_windows/ + +Hardware: + +6 core Intel Core i7-3930K (-MT-MCP-) + +Host OS: +Linux Mint 19/Ubuntu 18.04 +Kernel: 4.15.0-32-generic x86_64 +Qemu: QEMU emulator version 2.11.1 +Intel microcode (host): 0x714 +dmesg | grep microcode +[ 0.000000] microcode: microcode updated early to revision 0x714, date = 2018-05-08 +[ 2.810683] microcode: sig=0x206d7, pf=0x4, revision=0x714 +[ 2.813340] microcode: Microcode Update Driver: v2.2. + +Note: I manually updated the Intel microcode on the host from 0x713 to 0x714. However, both microcode versions produce the same result in the Windows guest. + +Guest OS: +Windows 10 Pro 64 bit, release 1803 \ No newline at end of file |