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-performance: 0.801
-graphic: 0.774
-KVM: 0.731
-architecture: 0.704
-x86: 0.571
-device: 0.568
-hypervisor: 0.479
-network: 0.455
-files: 0.434
-PID: 0.394
-kernel: 0.372
-vnc: 0.328
-semantic: 0.319
-ppc: 0.316
-socket: 0.287
-permissions: 0.272
-user-level: 0.266
-debug: 0.249
-boot: 0.237
-virtual: 0.227
-risc-v: 0.215
-VMM: 0.201
-register: 0.200
-TCG: 0.194
-peripherals: 0.142
-arm: 0.131
-i386: 0.119
-mistranslation: 0.088
-assembly: 0.068
-
-Emulated newer x86 chipsets are noticably slower on cpu-bound loads than "-cpu qemu64"
-Description of problem:
-I noticed that "-cpu qemu64" is much faster than "-cpu max" or "-cpu Icelake-Server-noTSX" for cpu bound loads, and with more than one cpu under load.
-Steps to reproduce:
-1. Run a guest as per "qemu-system-x86_64 -cpu max [..]" command from above. Any linux distro should do.
-2. run through the setup questions if you use Fedora-Server-KVM-41-1.4.x86_64.qcow2 from the example command line above
-3. log into the guest via ssh, i.e. "ssh chris@amd64" here
-4. cd /dev/shm; wget http://archive.apache.org/dist/httpd/httpd-2.4.57.tar.bz2; wget https://fluxcoil.net/files/tmp/job_httpd_extract_cpu.sh
-6. bash ./job_httpd_extract_cpu.sh 4 300
-8. cat /tmp/counter
-
-Step 6 is executing a script which simply uses 4 parallel loops, where each loop runs "bzcat httpd-2.4.57.tar.bz2" constantly. After 300sec, the successful uncompressions over all 4 loops are summed up and stored in /tmp/counter.
-
-- result with "-cpu qemu64": 96
-- result with "-cpu max": 84
-- result with "-cpu Icelake-Server-noTSX": 44
-Additional information:
-- For "-cpu Icelake-Server-noTSX" on this Thinkpad T590 I get these warnings, I think they are not relevant:
-  qemu-system-x86_64: warning: TCG doesn't support requested feature: CPUID.01H:ECX.pcid [bit 17]
-  qemu-system-x86_64: warning: TCG doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
-  [..]
-- I also looked at Broadwell etc, and all of them seem in the same ballpark.
-  Graph over some emulated architectures: https://fluxcoil.net/files/tmp/gnuplot_cpu-performance-emulated-only.png