fix(ops/whitby): Set tcp congestion control to bbr r/2332

Some quick testing shows that this improves my data transfer speed to
whitby by roughly 200%.

Change-Id: Id94de975b1ae0930f8d0fe038582dbac0037676c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2659
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: ben <tvl@benjojo.co.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/ops/nixos/whitby/default.nix b/ops/nixos/whitby/default.nix
index 5fdecafd272d..1bbab47f7a4d 100644
--- a/ops/nixos/whitby/default.nix
+++ b/ops/nixos/whitby/default.nix
@@ -77,6 +77,10 @@ in lib.fix(self: {
       };
     };
 
+    kernel.sysctl = {
+      "net.ipv4.tcp_congestion_control" = "bbr";
+    };
+
     loader.grub = {
       enable = true;
       version = 2;