The default maximum Linux TCP buffer sizes are too small.Oracle recommendations for related TCP and UDP parameters are following:
net.core.rmem_max = 4194304
net.core.rmem_default=262144
net.core.rmem_max= for 11g: 4194304 For 10g: 2097152 (With RDS use at least 4194304)
net.core.wmem_default=262144
net.core.wmem_max=1048576 (With RDS use at least 2097152)
ip_local_port_range 9000 65500
net.core.rmem_max= for 11g: 4194304 For 10g: 2097152 (With RDS use at least 4194304)
net.core.wmem_default=262144
net.core.wmem_max=1048576 (With RDS use at least 2097152)
ip_local_port_range 9000 65500
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