unauthenticated 问题始终不能解决

两台服务器，一台web，一台mysql，show processlist 会出现一些unauthenticated user ，之后我添加了 --skip-name-resolve禁止解析 并,在/etc/hosts里也添加了 x.x.x.x apache 用来解析web主机，但是还是会出现unauthenticated user ，但是速度似乎没有受到影响， 这是为什么呢？  我用的是mysql 5.1.30 ,配置文件是
port    = 3306
socket  = /usr/local/mysql/tmp/mysql.sock
bbsedir = /usr/local/mysql
datadir = /usr/local/mysql/var
open_files_limit    = 60
skip-name-resolve
back_log = 1000
max_connections = 100
max_connect_errors = 200
table_cache = 6
external-locking = FALSE
max_allowed_packet = 32M
sort_buffer_size = 128K
join_buffer_size = 128K
thread_cache_size = 10
thread_concurrency = 8
query_cache_size = 102M
query_cache_limit = 2M
query_cache_min_res_unit = 2k
default_table_type = MyISAM
thread_stack = 192K
transaction_isolation = READ-COMMITTED
tmp_table_size = 10M
max_heap_table_size = 10M
long_query_time = 1
log_long_format
server-id = 1
binlog_cache_size = 4M
max_binlog_cache_size = 8M
max_binlog_size = 512M
expire_logs_days = 7
key_buffer_size = 308M
read_buffer_size = 1M
read_rnd_buffer_size = 16M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_max_extra_sort_file_size = 10G
myisam_repair_threads = 1
myisam_recover