On 26. 02. 19, 16:30, Oleg Nesterov wrote: >> from our (SUSE) QA we received a report that this patch causes a >> performance decline in libmicro pthread_* benchmark as reported in: >> https://bugzilla.suse.com/show_bug.cgi?id=1126762 > > Access Denied > >> I tried myself from the repo: >> https://github.com/redhat-performance/libMicro >> >> I ran >> pthread_create -B 8 -C 200 -S >> >> and with the patch applied: >> # STATISTICS usecs/call (raw) usecs/call (outliers removed) >> # mean 23.38611 17.29311 >> >> Without: >> # mean 41.36539 39.21347 > > can't reproduce, I see the same numbers with or without this patch. > However, I did "./bin/pthread_create -B 8 -C 200 -S" under KVM.
Correct. I did the tests also under KVM. The above difference happens when you compare (by stupid mistake) a LOCKDEP and non-LOCKDEP kernel -- sorry. So the proper results are comparably the same -- the difference is on the noise level. So it must be their setup broken too. Thanks for the input anyway. -- js suse labs
