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+i386: 0.983
+performance: 0.961
+x86: 0.950
+TCG: 0.913
+architecture: 0.895
+graphic: 0.856
+vnc: 0.835
+device: 0.828
+kernel: 0.773
+ppc: 0.761
+boot: 0.755
+files: 0.739
+VMM: 0.736
+register: 0.728
+risc-v: 0.705
+PID: 0.678
+permissions: 0.628
+socket: 0.627
+arm: 0.626
+mistranslation: 0.582
+user-level: 0.483
+debug: 0.453
+semantic: 0.450
+virtual: 0.378
+KVM: 0.348
+hypervisor: 0.300
+network: 0.285
+assembly: 0.206
+peripherals: 0.174
+
+Absolutely slow Windows XP SP3 installation
+
+Host: Linux 4.3.3 vanilla x86-64/Qemu 2.5 i686 (mixed env)
+Guest: Windows XP Professional SP3 (i686)
+
+This is my launch string:
+
+$ qemu-system-i386 \
+-name "Windows XP Professional SP3" \
+-vga std \
+-net nic,model=pcnet \
+-cpu core2duo \
+-smp cores=2 \
+-cdrom /tmp/en_winxp_pro_with_sp3_vl.iso \
+-hda Windows_XP.qcow \
+-boot d \
+-net nic \
+-net user \
+-m 1536 \
+-localtime
+
+Console output:
+
+warning: TCG doesn't support requested feature: CPUID.01H:EDX.vme [bit 1]
+warning: TCG doesn't support requested feature: CPUID.80000001H:EDX.syscall [bit 11]
+warning: TCG doesn't support requested feature: CPUID.80000001H:EDX.lm|i64 [bit 29]
+warning: TCG doesn't support requested feature: CPUID.01H:EDX.vme [bit 1]
+warning: TCG doesn't support requested feature: CPUID.80000001H:EDX.syscall [bit 11]
+warning: TCG doesn't support requested feature: CPUID.80000001H:EDX.lm|i64 [bit 29]
+
+After hitting 35% installation more or less stalls (it actually doesn't but it progresses 1% a minute which is totally unacceptable).
+
+That was without KVM acceleration, so perhaps it's how it's meant to be.
+
+With KVM everything is fast and smooth.
+
+For integer workloads such as installing an OS you should expect TCG to be about 12x slower than KVM on average. That is on current master; note that TCG has gotten faster in the last couple of years. See a performance comparison from v2.7.0 to v2.11.0 for SPEC06 here: https://imgur.com/a/5P5zj
+
+I've therefore marked the report as invalid, as I don't think the aforementioned speedups will change your experience dramatically.
+