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| author | Andrew Jeffery <andrew@aj.id.au> | 2017-05-12 06:58:10 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-05-30 07:59:51 +0300 |
| commit | a3f952df3c6d205fe3b1e0e4848d3c3db4a28ef0 (patch) | |
| tree | 4b5fe78d44151ba3f2c7ee22ca7c588867d0b3c7 /arch/powerpc/Kconfig | |
| parent | 09b6c1129f899c72d70b8bea36020644aa3b5a28 (diff) | |
| download | linux-a3f952df3c6d205fe3b1e0e4848d3c3db4a28ef0.tar.xz | |
powerpc: Tweak copy selection parameter in __copy_tofrom_user_power7()
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>
Diffstat (limited to 'arch/powerpc/Kconfig')
0 files changed, 0 insertions, 0 deletions