> This is certainly significant, but a lot has happened between the two > versions. I few ideas: > > * compare some of the key configuration options: > # CONFIG_DEBUG_* > # CONFIG_PREEMPT* > # CONFIG_NO_HZ > # CONFIG_HZ
2.6.25: # CONFIG_DEBUG_DRIVER is not set # CONFIG_DEBUG_DEVRES is not set # CONFIG_DEBUG_FS is not set CONFIG_DEBUG_KERNEL=y # CONFIG_DEBUG_SHIRQ is not set # CONFIG_DEBUG_RT_MUTEXES is not set # CONFIG_DEBUG_SPINLOCK is not set # CONFIG_DEBUG_MUTEXES is not set # CONFIG_DEBUG_SPINLOCK_SLEEP is not set # CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set # CONFIG_DEBUG_KOBJECT is not set # CONFIG_DEBUG_HIGHMEM is not set CONFIG_DEBUG_BUGVERBOSE=y CONFIG_DEBUG_INFO=y # CONFIG_DEBUG_VM is not set # CONFIG_DEBUG_LIST is not set # CONFIG_DEBUG_SG is not set # CONFIG_DEBUG_STACKOVERFLOW is not set # CONFIG_DEBUG_STACK_USAGE is not set # CONFIG_DEBUG_PAGEALLOC is not set # CONFIG_DEBUGGER is not set # CONFIG_PREEMPT_NONE is not set # CONFIG_PREEMPT_VOLUNTARY is not set CONFIG_PREEMPT=y # CONFIG_PREEMPT_RCU is not set # CONFIG_NO_HZ is not set # CONFIG_HZ_100 is not set # CONFIG_HZ_250 is not set # CONFIG_HZ_300 is not set CONFIG_HZ_1000=y CONFIG_HZ=1000 2.6.18: # CONFIG_DEBUG_DRIVER is not set CONFIG_DEBUG_KERNEL=y # CONFIG_DEBUG_SLAB is not set # CONFIG_DEBUG_RT_MUTEXES is not set # CONFIG_DEBUG_SPINLOCK is not set # CONFIG_DEBUG_MUTEXES is not set # CONFIG_DEBUG_RWSEMS is not set # CONFIG_DEBUG_SPINLOCK_SLEEP is not set # CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set # CONFIG_DEBUG_KOBJECT is not set CONFIG_DEBUG_INFO=y # CONFIG_DEBUG_FS is not set # CONFIG_DEBUG_VM is not set # CONFIG_PREEMPT_NONE is not set # CONFIG_PREEMPT_VOLUNTARY is not set CONFIG_PREEMPT=y CONFIG_PREEMPT_BKL=y # CONFIG_HZ_100 is not set # CONFIG_HZ_250 is not set CONFIG_HZ_1000=y CONFIG_HZ=1000 > > * Try looking at where the time is spent, using oprofile or > readprofile Doing this now. > > * Try setting /proc/sys/kernel/compat/sched_yield to 1, to > get the legacy > behaviour of the scheduler. Made perfromance on .25 a few percent worse. (84 minutes on kernel compile instead of 81 minutes) > * Maybe there is a kernel version that supports your hardware in both > arch/ppc/ and arch/powerpc. In that case, you could see if > the platform > change had an impact. Will try. Last port in ppc branch was 2.6.18 and first in powerpc was 2.6.24. I should be able to port ppc to .25 also I think. Thanks! _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
