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Some supported XenServer build environments lack compiler support for
atomic operations. This patch provides native support for x86_64 on
GCC, which covers possible future 64-bit builds on XenServer.
Since this implementation is faster than the existing support prior to
GCC 4.7, especially for cmap inserts, we use this with GCC < 4.7 on
x86_64.
Example numbers with "tests/test-cmap benchmark 2000000 8 0.1" on
quad-core hyperthreaded laptop, built with GCC 4.6 -O2:
Using ovs-atomic-pthreads on x86_64:
Benchmarking with n=2000000, 8 threads, 0.10% mutations:
cmap insert: 4725 ms
cmap iterate: 329 ms
cmap search: 5945 ms
cmap destroy: 911 ms
Using ovs-atomic-gcc4+ on x86_64:
Benchmarking with n=2000000, 8 threads, 0.10% mutations:
cmap insert: 845 ms
cmap iterate: 58 ms
cmap search: 308 ms
cmap destroy: 295 ms
With the native support provided by this patch:
Benchmarking with n=2000000, 8 threads, 0.10% mutations:
cmap insert: 530 ms
cmap iterate: 59 ms
cmap search: 305 ms
cmap destroy: 232 ms
Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
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