Cliff Wickman 18c07cf530 x86, UV: cpu_relax in uv_wait_completion
The function uv_wait_completion() spins on reads of a memory-mapped
register, waiting for completion of BAU hardware replies.

It should call "cpu_relax()" between those reads to improve performance
on hyperthreaded configurations.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Acked-by: Jack Steiner <steiner@sgi.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-15 23:48:20 +01:00
..
2009-01-05 17:41:45 -08:00