On Fri, 9 Aug 2019 at 18:24, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > On 09/08/19 07:45, Wanpeng Li wrote: > > From: Wanpeng Li <wanpengli@xxxxxxxxxxx> > > > > Even if for realtime CPUs, cache line bounces, frequency scaling, presence > > of higher-priority RT tasks, etc can cause different response. These > > interferences should be considered and periodically revaluate whether > > or not the lapic_timer_advance_ns value is the best, do nothing if it is, > > otherwise recaluate again. > > How much fluctuation do you observe between different runs? Sometimes can ~1000 cycles after converting to guest tsc freq. Regards, Wanpeng Li
