Re: [tip:sched/hrtick] [hrtimer] 2889243848: stress-ng.timermix.ops_per_sec 30.1% regression

[Peter Zijlstra]

On Tue, Mar 10, 2026 at 10:46:16PM +0800, kernel test robot wrote:
> 
> 
> Hello,
> 
> kernel test robot noticed a 30.1% regression of stress-ng.timermix.ops_per_sec on:
> 
> 
> commit: 2889243848560b6b0211aba401d2fc122070ba2f ("hrtimer: Re-arrange hrtimer_interrupt()")
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git sched/hrtick
> 
> 
> testcase: stress-ng
> config: x86_64-rhel-9.4
> compiler: gcc-14
> test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory
> parameters:
> 
> 	nr_threads: 100%
> 	testtime: 60s
> 	test: timermix
> 	cpufreq_governor: performance
> 
> 
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-lkp/202603102229.74b9dee4-lkp@xxxxxxxxx
> 
> 
> Details are as below:
> -------------------------------------------------------------------------------------------------->
> 
> 
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20260310/202603102229.74b9dee4-lkp@xxxxxxxxx

As per always, I find it incredibly hard to deduce how the test is
actually ran.

I suppose this is:  stress-ng --timermix ....
but what arguments exactly?