rmem_default, wmem_default, rmem_max and wmem_max are reduced on rhel6.5

Issue

• rmem_default, wmem_default, rmem_max and wmem_max are reduced on rhel6.5. It may casue the performance regression in some cases.

RHEL6.5

# uname -r
2.6.32-431.el6.x86_64
# sysctl net.core.rmem_default net.core.wmem_default net.core.rmem_max net.core.wmem_max
net.core.rmem_default = 124928
net.core.wmem_default = 124928
net.core.rmem_max = 124928
net.core.wmem_max = 124928

RHEL6.4

# uname -r
2.6.32-358.el6.x86_64
# sysctl net.core.rmem_default net.core.wmem_default net.core.rmem_max net.core.wmem_max
net.core.rmem_default = 229376
net.core.wmem_default = 229376
net.core.rmem_max = 229376
net.core.wmem_max = 229376