deduplication cache disable message

Hi,

am getting below message in the deduplication job from one 5220 to another 5220 in the SLP job log.

 Info APPLIANCE1(pid=10527) StorageServer=PureDisk:APPLIANCE2; Report=PDDO Stats for (APPLIANCE2): scanned: 5944290 KB, CR sent: 1089216 KB, CR sent over FC: 0 KB, dedup: 81.7%, cache disabled

my querry is does that means caching is disabled during the duplication? if yes then what is the impact of enabling it now.