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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/1783422
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloadqemu-analysis-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
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add deepseek and gemma results
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+
+qemu_clock_get_ns does not take into account icount_time_shift
+
+Hello,
+
+If you check the qemu/util/qemu-timer.c you will find the following function:
+
+597: int64_t qemu_clock_get_ns(QEMUClockType type)
+598: {
+....
+602:    switch (type) {
+....
+606:    case QEMU_CLOCK_VIRTUAL:
+607:        if (use_icount) {
+608:            return cpu_get_icount(); 
+
+
+Now on line 606, in case we requested QEMU_CLOCK_VIRTUAL, and we are using icount, the value of cpu_get_icount(); will be returned.
+
+However if I understand correctly, in order to convert icount to ns, you must use take into account the icount shift -- as defined in the documentation: "The virtual cpu will execute one instruction every 2^N ns of virtual time.".
+
+Therefor, the correct value to return would be cpu_icount_to_ns(cpu_get_icount()), where cpu_icount_to_ns is defined in cpus.c:
+
+296: int64_t cpu_icount_to_ns(int64_t icount)
+297: {
+298:    return icount << icount_time_shift;
+299: }
+
+Best Regards,
+Humberto "SilverOne" Carvalho
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