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[rc5-72]/blocksize: the preferred size of blocks when requesting additional workunits from the upstream server. The default is 256. If clients need smaller block sizes, then your proxy will automatically split large blocks into the needed size, however clients will not be able to request blocks larger than the size your proxy currently has available, since the proxy cannot combine smaller blocks together. Be aware that when your proxy requests additional workunits from the upstream server, this blocksize value may cause your proxy to temporarily exceed the "maxkeysready" since requests will always be done in multiples of this value.