pg_archivecleanup issues

We have an issue with pg_archivecleanup and was wondering if anyone is
experiencing the same.

We use pg_archivecleanup to clean up old wal files prior to the last base
backup. However, if we have a lot of old wal files, it will only delete a
few even though it echos the statement pg_archivecleanup: removing file
"/opt/dbbackups/db1_wal_keep//000000010000013D00000079"

After all is said and done, we have to run pg_archivecleanup several times
in order to clean up all the old wal files. It just does not take care of
them all with one execution.

On a side note, these WAL files reside on an NFS share.

Just curious if anyone is experiencing the same.
--
Thanks,

Jorge Torralba
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