Re: [PATCH] powerpc: Tweak copy selection parameter in __copy_tofrom_user_power7()

2017-05-18 Thread Anton Blanchard
Hi Andrew, > Experiments with the netperf benchmark indicated that the size > selecting VMX-based copies in __copy_tofrom_user_power7() was > suboptimal on POWER8. Measurements showed that parity was in the > neighbourhood of 3328 bytes, rather than greater than 4096. The > change gives a

[PATCH] powerpc: Tweak copy selection parameter in __copy_tofrom_user_power7()

2017-05-11 Thread Andrew Jeffery
Experiments with the netperf benchmark indicated that the size selecting VMX-based copies in __copy_tofrom_user_power7() was suboptimal on POWER8. Measurements showed that parity was in the neighbourhood of 3328 bytes, rather than greater than 4096. The change gives a 1.5-2.0% improvement in