On Thu, Jul 31, 2014 at 03:21:54PM -0700, Jarno Rajahalme wrote: > XenServer runs OVS in dom0, which is a 32-bit VM. As the build > environment lacks support for atomics, locked pthread atomics were > used with considerable performance hit. > > This patch adds native support for ovs-atomic with 32-bit Pentium and > higher CPUs, when compiled with an older GCC. We use inline asm with > the cmpxchg8b instruction, which was a new instruction to Intel > Pentium processors. We do not expect anyone to run OVS on 486 or older > processor. > > cmap benchmark before the patch on 32-bit XenServer build (uses > ovs-atomic-pthread): > > $ tests/ovstest test-cmap benchmark 2000000 8 0.1 > Benchmarking with n=2000000, 8 threads, 0.10% mutations: > cmap insert: 8835 ms > cmap iterate: 379 ms > cmap search: 6242 ms > cmap destroy: 1145 ms > > After: > > $ tests/ovstest test-cmap benchmark 2000000 8 0.1 > Benchmarking with n=2000000, 8 threads, 0.10% mutations: > cmap insert: 711 ms > cmap iterate: 68 ms > cmap search: 353 ms > cmap destroy: 209 ms > > Signed-off-by: Jarno Rajahalme <jrajaha...@nicira.com>
Great work, thank you very much! Acked-by: Ben Pfaff <b...@nicira.com> _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
