The kernel memory slabs are collections of objects with a common purpose. They are used by the kernel to
store information in memory.
This slide shows an example of some slabs. There are slabs for storing information about the TCP sessions.
The entries in the route cache are also stored in memory slabs.
To check how much memory is being allocated to kernel slabs, use the command diagnose hardware
sysinfo slab.
The first column shows the slab name. The second column shows the total amount of active objects, then the
number of available objects, and then the size of each object.
This amount changes depending on resource usage. For example, if tcp sessions increase on FortiGate, so
will the available objects for that slab.
You can calculate the total amount of memory allocated to each slab type by multiplying the number of
available objects by their size.
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