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eILTzc/8JliMDwwwJiCmk245gEYCVogSHbg1abJxEueRfCI2dw8K+Y8hDA8+ARZ/EBw+UtALblD 7ps+BFUWBPNaoOTOFP3l7E1k/ZwqTj25f5zFYBjJm1saUxiDdX8j7qQlXKAsDhLLiI4q5GYgBCx a7gwvr0A9EX0pmf+5cUVhfY0+7SzbQrEuYfCdv5qT+BrOeWC9hQrjenCwqZYnsm2E6lDpmHakaV w5lHrEyj0E9fd0jHGMKnrwlo0ntG4qFlEk+Gbsn9wI7iiRNoITisv1xrUF3cBl/DV9CXHErdU+6 Jg0GTRNgrSy4HiKrNw7Idhy7LJnhF1JynRwrSi9YJtApPxY41IQ= X-Proofpoint-GUID: mTj_6avWSSEMuwIYUHVMjoNQQwsZg9tM X-Authority-Analysis: v=2.4 cv=N4Yk1m9B c=1 sm=1 tr=0 ts=690a41e6 b=1 cx=c_pps a=qoll8+KPOyaMroiJ2sR5sw==:117 a=qoll8+KPOyaMroiJ2sR5sw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RGnG5d-m14Jcu087PskA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 cc=ntf awl=host:12124 On 10/30/25 3:29 AM, Adam Li wrote: > Hi Joseph, > > On 10/18/2025 1:01 AM, Joseph Salisbury wrote: >> >> On 10/10/25 13:09, Peter Zijlstra wrote: >>> On Thu, Oct 09, 2025 at 09:04:40PM -0400, Joseph Salisbury wrote: >>> > [...] >>> diff --git a/kernel/sched/features.h b/kernel/sched/features.h >>> index 3c12d9f93331..5ded210701d0 100644 >>> --- a/kernel/sched/features.h >>> +++ b/kernel/sched/features.h >>> @@ -121,3 +121,8 @@ SCHED_FEAT(WA_BIAS, true) >>>   SCHED_FEAT(UTIL_EST, true) >>>     SCHED_FEAT(LATENCY_WARN, false) >>> + >>> +SCHED_FEAT(NI_TARGET, false) >>> +SCHED_FEAT(NI_SPARE, false) >>> +SCHED_FEAT(NI_RUNNABLE, false) >>> +SCHED_FEAT(NI_RANDOM, false) > [...] >> Thanks for providing the patch! >> >> I performed the same testing with this patch applied to a v6.12 based kernel.  The performance regression still exists and is slightly worse. >> The drgn stats are attached in a file named 'apache_drgn_log_NewidleRework_From_Peter.log'. >> >> > Just wondering, did you enable NI_TARGET feature? > It is default false in Peter's patch. > In my test 'NI_TARGET' can fix the regression caused by commit 155213a2aed4. > > Thanks, > -adam > I ran some tests with NI_TARGET enabled.  I can confirm that Peter's patch with NI_TARGET enabled does regain all the performance back.