Add a simple form of output rate limiting by counting the number of

certain C0 sequences (linefeeds, backspaces, carriage returns) and if it
exceeds a threshold (current default 50/millisecond), start to redraw
the pane every 100 milliseconds instead of making each change as it
comes. Two configuration options - c0-change-trigger and
c0-change-interval.

This makes tmux much more responsive under very fast output (for example
yes(1) or accidentally cat'ing a large file) but may not be perfect on
all terminals and connections - feedback very welcome, particularly
where this change has a negative rather than positive effect (making it
off by default is a possibility).

After much experimentation based originally on a request Robin Lee
Powell (which ended with a completely different solution), this idea
from discussion with Ailin Nemui.

1 files changed, 16 insertions, 1 deletions

diff --git a/usr.bin/tmux/options-table.c b/usr.bin/tmux/options-table.c
index 7070d22931b..45affd4e96e 100644
--- a/usr.bin/tmux/options-table.c
+++ b/usr.bin/tmux/options-table.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: options-table.c,v 1.24 2012/03/17 21:40:53 nicm Exp $ */
+/* $OpenBSD: options-table.c,v 1.25 2012/03/20 11:01:00 nicm Exp $ */
 
 /*
  * Copyright (c) 2011 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -465,6 +465,21 @@ const struct options_table_entry window_options_table[] = {
 	  .default_num = 1
 	},
 
+
+	{ .name = "c0-change-trigger",
+	  .type = OPTIONS_TABLE_NUMBER,
+	  .default_num = 50,
+	  .minimum = 0,
+	  .maximum = USHRT_MAX
+	},
+
+	{ .name = "c0-change-interval",
+	  .type = OPTIONS_TABLE_NUMBER,
+	  .default_num = 100,
+	  .minimum = 1,
+	  .maximum = USHRT_MAX
+	},
+
 	{ .name = "clock-mode-colour",
 	  .type = OPTIONS_TABLE_COLOUR,
 	  .default_num = 4