Messages in this thread | | | Subject | Re: [PATCH RFC] x86 / CPU: Add cpu isolation flag for avoiding disturbance from aperfmperf IPI | From | Konstantin Khlebnikov <> | Date | Thu, 25 Apr 2019 15:27:12 +0300 |
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On 25.04.2019 14:45, Peter Zijlstra wrote: > On Thu, Apr 25, 2019 at 01:46:51PM +0300, Konstantin Khlebnikov wrote: >> Sensitive workloads like DPDK polling do not like any interrupts. >> >> This patch adds flag 'freq' for boot option 'isolcpu': isolcpu=freq,<cpus>. >> >> Users like show_cpuinfo() fallback to frequency from generic cpufreq >> policy if arch-specific requesting method returns 0. > > Then don't touch that sysfs file?
What sysfs file? I mean many applications read /proc/cpuinfo and this triggers IPI to all cpus.
> > I really hate having an option for just this. >
This could be generalized to 'isolate cpu from unnecessary IPI'. Something like mm pagevec drain also could be avoided.
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