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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
commitd0c85e36e4de67af628d54e9ab577cc3fad7796a (patch)
treef8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/gemma3:12b/performance/1847525
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloadqemu-analysis-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
qemu-analysis-d0c85e36e4de67af628d54e9ab577cc3fad7796a.zip
add deepseek and gemma results
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+
+qemu-system-i386 eats a lot of cpu after just few hours,  with sdl,gl=on
+
+I already send this email to <email address hidden> , but I can't see it arriving in archives, so here  is copy.
+
+Hello, all!
+
+I use qemu-system-i386/qemu-system_x86_64 for rebuilding Slax-like live cd/dvd.
+Usually guests (with various self-compiled kernels and X stack with kde3 on top of them)
+boot up normally, but if I left them to run in GUI mode for few hours - qemu process on host
+started to eat more and more cpu for itself - more notiecable if I set host cpu to lowest possible
+frequency via trayfreq applet (1400Mhz in my case).
+
+Boot line a bit complicated, but I really prefer to have sound and usb inside VM.
+qemu-system-i386 -cdrom /dev/shm/CDROM-4.4.194_5.iso -m 1.9G -enable-kvm -soundhw es1370 -smp 2 -display sdl,gl=on -usb -cpu host -rtc clock=vm
+
+rtc clock=vm was taken from https://bugs.launchpad.net/qemu/+bug/1174654 but apparently not helping.
+After just 3 hours of uptime (copied line from 'top' on host)
+
+31943 guest     20   0 2412m 791m  38m R   51  6.7  66:36.51 qemu-system-i38
+
+I use Xorg 1.19.7 on host, with mesa git/nouveau as GL driver. But my card has not very big amount of VRAM - only 384Mb.
+May be this limitation is playing some role .. but 'end-user' result was after 1-2 day of guest uptime I run into completely frozen guest 
+(may be when qemu was hitting 100 one core usage on host some internal timer just made guest kernel too upset/froze?
+ I was sleeping or doing other things on host  for all this time, with VM just supposedly running at another virtual desktop - 
+in KDE3 + built-in compositor ....)
+
+I wonder if more mainstream desktop users (on GNOME, Xfce, etc) and/or users of other distros (I use self-re-compiled Slackware)
+actually can see same problem?
+
+qemu-system-i386 --version
+QEMU emulator version 4.1.50 (v4.1.0-1188-gc6f5012ba5-dirty)
+but I saw same behavior for quite some time .. just never reported it in hope it will go away.
+
+cat /proc/cpuinfo
+processor       : 0
+vendor_id       : AuthenticAMD
+cpu family      : 21
+model           : 2
+model name      : AMD FX(tm)-4300 Quad-Core Processor
+stepping        : 0
+microcode       : 0x6000852
+cpu MHz         : 1399.977
+cache size      : 2048 KB
+physical id     : 0
+siblings        : 4
+core id         : 0
+cpu cores       : 2
+apicid          : 16
+initial apicid  : 0
+fpu             : yes
+fpu_exception   : yes
+cpuid level     : 13
+wp              : yes
+flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb cpb hw_pstate ssbd vmmcall bmi1 arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
+bugs            : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypass
+bogomips        : 7600.06
+TLB size        : 1536 4K pages
+clflush size    : 64
+cache_alignment : 64
+address sizes   : 48 bits physical, 48 bits virtual
+power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro
+
+[and 3x more of the same, for 3 remaining cores]
+
+Gcc is Slackware 14.2's gcc 5.5.0, but I saw this with 4.9.2 too.
+This might be 32-bit host problem. But may be just no-one tried to run qemu with GUI guest for literaly days?
+
+Host kernel is
+ uname -a
+Linux slax 5.1.12-x64 #1 SMP PREEMPT Wed Jun 19 12:31:05 MSK 2019 x86_64 AMD FX(tm)-4300 Quad-Core Processor AuthenticAMD GNU/Linux
+
+I was trying newish 5.3.2 but my compilation was not as stable as this one 
+(I tend to change few things, like max cpu count, preemption mode, numa support .... 
+for more distribution-like, yet most stable  and performant for me kernel)
+
+Kernel world is moving fast, so I'll try to recompile new 5.3.x too ....
+
+
+I guess I  should provide perf/profiler output, but for  this I need to recompile qemu. 
+I'll try to come back with more details soon.
+
+Thanks for your attention and possible feedback!
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