> > > SMT siblings share caches and other hardware, halt polling will > > > degrade its sibling performance if its sibling is busy > > > > Do you have any real scenario benefits? As the polling nature, some > > cloud providers will configure to their preferred balance of cpu usage > > and performance, and other cloud providers for their NFV scenarios > > which are more sensitive to latency are vCPU and pCPU 1:1 pin，you > > destroy these setups. > > > > Wanpeng > Run a copy (single thread) Unixbench, with or without a busy poll program in its SMT sibling, and Unixbench score can lower 1/3 with SMT busy polling program Can this case show this issue? -Li > True, it benefits for our real scenario. > > this patch can lower our workload compute latency in our multiple cores VM > which vCPU and pCPU is 1:1 pin, and the workload with lots of computation and > networking packets. > > -Li
