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Diffstat (limited to 'results/classifier/gemma3:12b/performance/2821')
| -rw-r--r-- | results/classifier/gemma3:12b/performance/2821 | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/results/classifier/gemma3:12b/performance/2821 b/results/classifier/gemma3:12b/performance/2821 new file mode 100644 index 00000000..1bd60379 --- /dev/null +++ b/results/classifier/gemma3:12b/performance/2821 @@ -0,0 +1,24 @@ + +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 |