------- Comment From a.efrem...@ru.ibm.com 2016-03-23 12:01 EDT------- On kernel 4.4.0-15: CONFIG_NUMA_BALANCING_DEFAULT_ENABLED is still y, though requested "disabled"
root@s83lp41:~# cat /boot/config-4.4.0-15-generic | grep _NUMA CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=y CONFIG_NUMA_BALANCING=y CONFIG_NUMA_BALANCING_DEFAULT_ENABLED=y CONFIG_NUMA=y CONFIG_NUMA_EMU=y root@s83lp41:~# cat /boot/config-4.4.0-15-generic | grep _EMU_SIZE CONFIG_EMU_SIZE=0x10000000 root@s83lp41:~# uname -a Linux s83lp41 4.4.0-15-generic #31-Ubuntu SMP Fri Mar 18 19:07:12 UTC 2016 s390x s390x s390x GNU/Linux -- 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/1557690 Title: s390/kconfig: CONFIG_NUMA without CONFIG_NUMA_EMU does not make any sense on s390x Status in linux package in Ubuntu: Fix Released Status in linux source package in Xenial: Fix Released Bug description: == Comment: #0 - Hendrik Brueckner - 2016-03-15 06:33:03 == For NUMA, ensure the setting of these kernel configuration for s390x: # CONFIG_NUMA_BALANCING_DEFAULT_ENABLED is not set CONFIG_NUMA_EMU=y CONFIG_EMU_SIZE=0x10000000 CONFIG_NUMA without CONFIG_NUMA_EMU does not make any sense. s390 does not provide hardware topology information. However, we do support fake NUMA to improve performance issues seen with very large memory configurations. Therefore, CONFIG_NUMA_EMU has to be enabled. Given that we only support fake NUMA CONFIG_NUMA_BALANCING_DEFAULT_ENABLED should be disabled, since it moves pages without any benefit but costs additional cpu cycles. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1557690/+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
