SQL Server 2008R2 Waits

WRITELOG PAGEIOLATCH_SH PREEMPTIVE_OS_GETPROCADDRESS ASYNC_NETWORK_IO LCK_M_IX PREEMPTIVE_OS_WAITFORSINGLEOBJEC PREEMPTIVE_OS_AUTHENTICATIONOPS SOS_SCHEDULER_YIELD ASYNC_IO_COMPLETION PAGEIOLATCH_UP SLEEP_BPOOL_FLUSH