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Diffstat (limited to 'Documentation/networking/ip-sysctl.rst')
| -rw-r--r-- | Documentation/networking/ip-sysctl.rst | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index a759872a2883..e7b3fa7bb3f7 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -1040,6 +1040,35 @@ tcp_challenge_ack_limit - INTEGER TCP stack implements per TCP socket limits anyway. Default: INT_MAX (unlimited) +tcp_ehash_entries - INTEGER + Show the number of hash buckets for TCP sockets in the current + networking namespace. + + A negative value means the networking namespace does not own its + hash buckets and shares the initial networking namespace's one. + +tcp_child_ehash_entries - INTEGER + Control the number of hash buckets for TCP sockets in the child + networking namespace, which must be set before clone() or unshare(). + + If the value is not 0, the kernel uses a value rounded up to 2^n + as the actual hash bucket size. 0 is a special value, meaning + the child networking namespace will share the initial networking + namespace's hash buckets. + + Note that the child will use the global one in case the kernel + fails to allocate enough memory. In addition, the global hash + buckets are spread over available NUMA nodes, but the allocation + of the child hash table depends on the current process's NUMA + policy, which could result in performance differences. + + Note also that the default value of tcp_max_tw_buckets and + tcp_max_syn_backlog depend on the hash bucket size. + + Possible values: 0, 2^n (n: 0 - 24 (16Mi)) + + Default: 0 + UDP variables ============= |