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.
