2 ms·
When the lookup key is a hash, there's no locality over the megabytes of the table. So don't all the extra memory accesses to support dedup affect the L1 and L2
by wpollock 2y ago
When the lookup key is a hash, there's no locality over the megabytes of the table. So don't all the extra memory accesses to support dedup affect the L1 and L2 caches? Has anyone at OpenZFS measured that?
It also occurs to me that spacial locality on spinning rust disks might be affected, also affecting performance.