On Fri, May 30, 2014 at 8:26 PM, saravanakumar punith <saravanakumar.pun...@gmail.com> wrote: > > Hi, > Is there any way to measure interrupt latency ( delay between interrupt > occurred and interrupt service routine is getting called) in VM. > > Consider a device is assigned to a VM (using passthrough). > Now, interrupt is triggered for the device. > > I believe kernel code in Host side is getting called first and then > corresponding interrupt handler > registered in Guest side is getting called. > > Now , I would like to measure the latency between > a. interrupt notification at host side > b. Actual interrupt handler called at Guest side > > Is there a (software)method exists to measure interrupt latency for a device > inside VM.? > Architecutre : X86_64 and qemu-kvm used. > > PS: > I read about using some high precision timer and measure time difference. > But I am not sure whether it is possible to access the timer from Host and > Guest and measure the latency. > > Please let me know. > Thanks > > >
Can someone help ? Thanks
