search for: 64hz

..., I found many palaces written with time.scheduleAtFixedRate(), Informations from Internet told me this function scheduleAtFixedRate demands a higher time resolution. so I guess the whole process may be this: java wants a higher time resolution timer, so it changes the RTC's rate from 15.625ms(64HZ) to 976.562us(1024HZ), after that, it reconfirms whether the time is accurate as expected, but it's sorry to get some notice it 's not accurate either. so it sets the RTC's rate from 15.625ms(64HZ) to 976.562us(1024HZ) again and again..., at last, results in a slow system timer in vm....

Keir, The patch moves ACPI timer to HV, which is the last platform timer in Qemu. We found Vista polls ACPI timer very frequently (about 15 times averagely) when handling timer (RTC @ 64HZ) interrupt routine. Though the exact reason is known, it should be related to system time adjustment. When it''s in Qemu, the overhead is big. After moving, Vista''s idle overhead decreases dramatically from ~10% to 0.9%. Another benefit is that Vista can only pass Performance rat...