Only scrub when plugged in on Linux, and TCP optimization.

ansible/roles/base/tasks/linux.yaml

@@ -26,17 +26,6 @@
     daemon_reload: yes
     enabled: yes
 
-# Of questionable value since I don't use swap on my machines
-- name: Configure sysctls for swap
-  sysctl:
-    name: "{{ item.name }}"
-    value: "{{ item.value }}"
-    state: present
-    sysctl_file: /etc/sysctl.d/swap.conf
-  loop:
-    - name: vm.swappiness
-      value: 10
-
 - name: Install scripts
   copy:
     src: "files/{{ item.src }}"
@@ -49,3 +38,31 @@
       dest: /usr/local/bin/mount_disk_image
     - src: watch_linux
       dest: /usr/local/bin/ww
+
+- name: Configure sysctls
+  sysctl:
+    name: "{{ item.name }}"
+    value: "{{ item.value }}"
+    state: present
+    sysctl_file: /etc/sysctl.d/{{ item.file }}
+  loop:
+    # Of questionable value since I don't use swap on my machines
+    - name: vm.swappiness
+      value: 10
+      file: swap.conf
+    # Enable TCP packetization-layer PMTUD when an ICMP black hole is detected.
+    - name: net.ipv4.tcp_mtu_probing
+      value: 1
+      file: tcp.conf
+    # Switch to bbr tcp congestion control which should be better on lossy connections like bad wifi.
+    - name: net.ipv4.tcp_congestion_control
+      value: bbr
+      file: tcp.conf
+    # Don't do a slow start after a connection has been idle for a single RTO.
+    - name: net.ipv4.tcp_slow_start_after_idle
+      value: 0
+      file: tcp.conf
+    # 3x time to accumulate filesystem changes before flushing to disk.
+    - name: vm.dirty_writeback_centisecs
+      value: 1500
+      file: power.conf