Just to be sure, since Ubuntu's gcc has "--enable-default-pie" I wanted to check. Do "the others" set pie by default as well? Just want to make sure that their execution without explicit pie is -no-pie while ours would then be -pie.
For your kernel thoughts - even though the first idea was already falsified by your tests. You said you are on Kernel 4.4, but the change you mentioned as "maybe related" was in 4.13 and reverted in 4.15. That said since you suspect the kernel to be related, is in that regard a major difference between? linux: 4.4.0-141.167 linux-hwe: 4.15.0-43.46~16.04.1 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1812182 Title: Performance degradation with SPECint2017 Status in Ubuntu on IBM z Systems: Incomplete Status in gcc-5 package in Ubuntu: Incomplete Status in glibc package in Ubuntu: Incomplete Status in linux package in Ubuntu: Incomplete Bug description: Problem description: During our Linux distribution performance regression testing, we found *significant* performance degradations on Ubuntu 16.04.5 LTS compared to other major Linux distributions on s390x when running SPECint2017. Some SPECint2017 micro-benchmarks show a performance degradation of 40%. Hardware environment: IBM z14, LPAR 1 IFL, SMT on 4GiB memory Software environment: Ubuntu 16.04.5 LTS SPECint2017 Analysis: We are currently in the progress of analyzing the problem and will get back to this bug as soon as we have more insights. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1812182/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
