Sever ผิดปกติไหมครับ

[P1005]

Intel Xeon Quad-core Processor E5620
2.40GHz RAM  8GB
ลง CenOS 6.4
percona  5.55.33
ดูกราฟไม่ทราบว่าผิดปกติไหมครับ  และควรปรับ my.cnf  ตรงไหนบ้างครับ
################## Star MySQL-Config  #####################

[client]
port      = 3306
socket      = /var/lib/mysql/mysql.sock
default-character-set=tis620

[mysqld]
port      = 3306
socket      = /var/lib/mysql/mysql.sock
skip-external-locking
skip-federated
big-tables
character-set-server=tis620
key_buffer = 1024M
max_allowed_packet = 1024M
table_open_cache = 3500
sort_buffer_size = 1M 
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 256M
thread_cache_size = 8
query_cache_type = 2
query_cache_size = 512M
thread_concurrency = 8
low_priority_updates=1
skip-name-resolve
skip-character-set-client-handshake
init_connect = 'SET NAMES tis620'
max_connections = 200
event_scheduler = 0
################## InnoDB  #######################
innodb_data_home_dir = /var/lib/mysql/
innodb_data_file_path = ibdata1:100M:autoextend
innodb_log_group_home_dir = /var/lib/mysql/
innodb_buffer_pool_size = 2G
innodb_buffer_pool_instances = 8
innodb_additional_mem_pool_size = 32M
innodb_log_file_size = 256M
innodb_file_format=Barracuda
innodb_file_per_table=1
innodb_purge_threads=1
innodb_log_buffer_size = 8M
innodb_log_files_in_group = 3
innodb_flush_log_at_trx_commit = 2
innodb_lock_wait_timeout = 120
innodb_thread_concurrency = 8
innodb_flush_method=O_DIRECT
innodb_checksums=0   
innodb_doublewrite=0   
innodb_support_xa=0       
innodb_max_dirty_pages_pct=90   
innodb_open_files = 3500
innodb_locks_unsafe_for_binlog=1
join_buffer_size = 2M
concurrent_insert = 2
max_heap_table_size = 512M

############# Percona XtraDB ############
innodb_io_capacity = 200     
innodb_write_io_threads = 8   
innodb_read_io_threads = 8

[mysqldump]
quick
max_allowed_packet = 1024M
allow-keywords

[mysql]
no-auto-rehash
default-character-set=tis620

[isamchk]
key_buffer = 512M
sort_buffer_size = 512M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 512M
sort_buffer_size = 512M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

[mysqld_safe]
open-files-limit = 50000


################# End MySQL-Config  #################

[P1005]

เพิ่มรูปครับ

[jackkawave]

innodb_buffer_pool_size =  50-80% ของ Ram Server      เครดิต  อ.tanoy999