I just noticed this email. It sounds beneficial, but no patch was included. Do you want to send the patch?
On Wed, Sep 07, 2016 at 08:58:02PM +0000, Rodriguez Betancourt, Esteban wrote: > The existing implementation uses a switch with > many conditions, that when compiled is translated > to a not optimal series of conditional jumps. > > With a lookup table the generated code has less conditional jumps, > that should translate in improving the CPU ability to predict the > jumps. > > Performance Comparison: > All the timings are in nanoseconds, "OVS Master" corresponds to 13a1d36. > N is the number of repetitions > > Serialize vswitch.ovsschema > N OVS Master Lookup Table Difference Diff per op > 1 233182 200369 32813 32813 > 10 2724931 1919168 805763 80576.3 > 100 22802794 24406648 -1603854 -16038.54 > 1000 253645888 206259760 47386128 47386.128 > 10000 2352245703 1906839780 445405923 44540.5923 > 100000 23967770920 19012178655 4955592265 49555.92265 > > Serialize echo example > N OVS Master Lookup Table Difference Diff per op > 1 3857 12565 -8708 -8708 > 10 17403 7312 10091 1009.1 > 100 57859 56613 1246 12.46 > 1000 592310 528110 64200 64.2 > 10000 6096334 5576109 520225 52.0225 > 100000 60970439 58477626 2492813 24.92813 > > Serialize mutate example > N OVS Master Lookup Table Difference Diff per op > 1 7115 19051 -11936 -11936 > 10 34110 39561 -5451 -545.1 > 100 296613 298645 -2032 -20.32 > 1000 3510499 2930588 579911 579.911 > 10000 33898710 30278631 3620079 362.0079 > 100000 305069356 280622992 24446364 244.46364 > > > Signed-off-by: Esteban Rodriguez Betancourt <esteb...@hpe.com> > _______________________________________________ > dev mailing list > dev@openvswitch.org > http://openvswitch.org/mailman/listinfo/dev _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
