[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: IRQ latency measurements in hypervisor
Hi Stefano, On 15/01/2021 23:17, Stefano Stabellini wrote: On Fri, 15 Jan 2021, Volodymyr Babchuk wrote:9us was in idle state. Interestingly enough, I got latency if 3us while Dom0 was doing some CPU-intensive tasks. So, under load latency is lower than in idle state. I didn't investigated this, so I can't tell you what causes this behavior.Did you use vwfi=native? You should definitely be able to see ~3us without interference and with 1vCPU <-> 1pCPU vwfi=native works well in a scenario where each pCPU is dedicated to a vCPU. However, if you start to oversubscribe the pCPU, the performance are going to degrade quite a lot because there will be less opportunity to schedule a different vCPU. You will also waste quite a bit of pCPU cycles because the vCPU will sit doing nothing until the end of its time slice. Cheers, -- Julien Grall
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