Why are the shmmax and shmall defaults very high in Red Hat Enterprise Linux 5 and 6?
Issue
-
After installing RHEL5, the system sets up
kenel.shmmaxandkenel.shmallwith high values using sysctl.conf :#cat /etc/sysctl.conf [..] # Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736 # 68719476736/1024/1024/1024 = 64,so that means maximum segment size is 64 Gi Byte. # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 # 4294967296*4096/1024/1024/1024 = 16384 Gi Byte [..]
Environment
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
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