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When Gigabit Ethernet interconnections are used, a high load can cause LMX/LLT to flow-control VCSIPC, resulting in warning messages to be reported in the Oracle trace file. The default location for the trace file is $ORACLE_HOME/rdbms/log; it may have changed if the parameters background_dump_dest or user_dump_dest have been changed. The messages resemble:
Unix process pid; 9560, image: oracle@MCB4800 (LMS0)
*** SESSION ID:(5.1) 2003-03-22 10:18:44.387
VCSIPC wait: WARNING: excessive poll done, 1001 times
VCSIPC wait: WARNING: excessive poll done, 1001 times
VCSIPC wait: WARNING: excessive poll done, 1002 times
VCSIPC wait: WARNING: excessive poll done, 1003 times
VCSIPC wait: WARNING: excessive poll done, 1004 times
VCSIPC wait: WARNING: excessive poll done, 1005 times
As a workaround, you can change the LLT lowwater mark, highwater mark, and window values for flow control. Please contact Veritas support for more information about changing these values.