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Andrew Jeffery authored
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 performance for 4096-byte buffers, reducing the relative time spent in __copy_tofrom_user_power7() from approximately 7% to approximately 5% in the TCP_RR benchmark. Signed-off-by:
Andrew Jeffery <andrew@aj.id.au> Acked-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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