ipv4: add kernel parameter tcpmhash_entries

This patch also adds a reference to ip-sysctl.txt
where TCP metrics setup is described

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4c81a860cc2b..e8066db54d3d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3412,6 +3412,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                         neutralize any effect of /proc/sys/kernel/sysrq.
                         Useful for debugging.
 
+        tcpmhash_entries= [KNL,NET]
+                        Set the number of tcp_metrics_hash slots.
+                        Default value is 8192 or 16384 depending on total
+                        ram pages. This is used to specify the TCP metrics
+                        cache size. See Documentation/networking/ip-sysctl.txt
+                        "tcp_no_metrics_save" section for more details.
+
         tdfx=           [HW,DRM]
 
         test_suspend=   [SUSPEND][,N]