The nf_flow_table table entry size

It is 64 bytes. nf_flow_table is a data structure used in the Linux kernel for network flow table management, which is used to store and manage information about network flows. nf_flow_table's table entry size is something that may vary depending on the specific kernel version, system configuration, and hardware platform. Here is some general overview: In Linux kernel version 4.18 and earlier, the table nf_flow_table entry size is 128 bytes. In Linux kernel 4.19 and some later versions, this can be configured and extended as needed by using the Flowtable framework. By default nf_flow_table has a table entry size of 64 bytes. However, the fields and size of each table entry in Flowtable can be modified and increased by configuring kernel parameters or using specific kernel modules, cls_flower, act_ct, and so on.