Change the hashtable max loadfactor to 70% from 80%.
Change the hashtable max loadfactor to 70% from 80%.

Analysis suggests at 80% load factor, 5 quadratic probes going a distance of
15 from the initally probed location are likely to spill over into the next 64
byte cache line. For a 70% load factor, <4 probes going a distance of <8 from
the initial location are likely to be within the same cache line,
significantly speeding the lookups.

This also reduces the loading of the bloomfilter to below optimal for k=1, but
modelling suggests using k=2 for the same size bloom filter would be adding
another 50% chance L2 cache lookup and would be slower. Sticking with k=1 is
not only simpler, but faster.

sourcefrog/librsync,librsync/librsync,dbaarda/librsync,sourcefrog/librsync,librsync/librsync,sourcefrog/librsync,librsync/librsync,dbaarda/librsync,sourcefrog/librsync,librsync/librsync,dbaarda/librsync,dbaarda/librsync