From 586fa0f2058dda60f4e57f865b57a566e8b60445 Mon Sep 17 00:00:00 2001
From: Chris Koeritz <fred@gruntose.com>
Date: Tue, 31 Jul 2012 11:07:01 -0400
Subject: [PATCH] new scripts for tinkering with tcp buffer sizes on linux.

---
 scripts/networking/set_tcp_config.sh  | 24 ++++++++++++++++++++++++
 scripts/networking/show_tcp_memory.sh | 17 +++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 scripts/networking/set_tcp_config.sh
 create mode 100644 scripts/networking/show_tcp_memory.sh

diff --git a/scripts/networking/set_tcp_config.sh b/scripts/networking/set_tcp_config.sh
new file mode 100644
index 00000000..7fc3d76e
--- /dev/null
+++ b/scripts/networking/set_tcp_config.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# this script modifies the linux kernel for maximum tcp buffer size, which can
+# improve long-haul transfers over a wan.
+
+# new maximum buffer size to set.
+new_max=4194304
+
+echo "net.core.wmem_max=$new_max" >> /etc/sysctl.conf
+echo "net.core.rmem_max=$new_max" >> /etc/sysctl.conf
+
+echo "net.ipv4.tcp_rmem= 10240 87380 $new_max" >> /etc/sysctl.conf
+echo "net.ipv4.tcp_wmem= 10240 87380 $new_max" >> /etc/sysctl.conf
+
+echo "net.ipv4.tcp_window_scaling = 1" >> /etc/sysctl.conf
+
+echo "net.ipv4.tcp_timestamps = 1" >> /etc/sysctl.conf
+
+echo "net.ipv4.tcp_sack = 1" >> /etc/sysctl.conf
+
+echo "net.ipv4.tcp_no_metrics_save = 1" >> /etc/sysctl.conf
+
+echo "net.core.netdev_max_backlog = 5000" >> /etc/sysctl.conf
+
diff --git a/scripts/networking/show_tcp_memory.sh b/scripts/networking/show_tcp_memory.sh
new file mode 100644
index 00000000..7e81e94d
--- /dev/null
+++ b/scripts/networking/show_tcp_memory.sh
@@ -0,0 +1,17 @@
+
+function show_proc()
+{
+  echo ----------------------------------------------
+  echo $*
+  $*
+}
+
+show_proc cat /proc/sys/net/ipv4/tcp_mem
+show_proc cat /proc/sys/net/core/rmem_default
+show_proc cat /proc/sys/net/core/rmem_max
+show_proc cat /proc/sys/net/core/wmem_default
+show_proc cat /proc/sys/net/core/wmem_max
+show_proc cat /proc/sys/net/core/optmem_max
+show_proc cat /proc/net/sockstat
+show_proc cat /proc/sys/net/ipv4/tcp_max_orphans
+
-- 
2.34.1