[linus:master] [xfrm] 89fefad9f9: stress-ng.epoll.ops_per_sec 25.4% regression

[kernel test robot]

Hello,

kernel test robot noticed a 25.4% regression of stress-ng.epoll.ops_per_sec on:


commit: 89fefad9f971bc637fb22373078144f2563c4be9 ("xfrm: serialize state GC with device state flush") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

testcase: stress-ng
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 256 threads 4 sockets INTEL(R) XEON(R) PLATINUM 8592+ (Emerald Rapids) with 256G memory
parameters:

	nr_threads: 100%
	testtime: 60s
	test: epoll
	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 <yi1.lai@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202610201112.ddb3ab07-lkp@xxxxxxxxx


Details are as below:
-------------------------------------------------------------------------------------------------->


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261020/202610201112.ddb3ab07-lkp@xxxxxxxxx

=========================================================================================
compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
  gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-emr-2sp1/epoll/stress-ng/60s

commit: 
  d042487dc1 ("xfrm: iptfs: fix stack OOB read in iptfs_skb_reset_frag_walk()")
  89fefad9f9 ("xfrm: serialize state GC with device state flush")

d042487dc118e494 89fefad9f971bc637fb22373078
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
 1.889e+08           -25.4%   1.41e+08        stress-ng.epoll.ops
   3146137           -25.4%    2347837        stress-ng.epoll.ops_per_sec


Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.


-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki