lkml.org 
[lkml]   [2021]   [Jul]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject答复: [PATCH] KVM: Consider SMT idle status when halt polling
    Date
    > > > 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
    \
     
     \ /
      Last update: 2021-07-22 19:36    [W:4.354 / U:0.020 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site