MINOR: h2: expose tune.h2.initial-window-size to configure the window size
This will be advertised in the settings frame.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 5543f4c..e64cd32 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -600,6 +600,7 @@
- tune.chksize
- tune.comp.maxlevel
- tune.h2.header-table-size
+ - tune.h2.initial-window-size
- tune.http.cookielen
- tune.http.logurilen
- tune.http.maxhdr
@@ -1375,6 +1376,16 @@
memory is consumed for each HTTP/2 connection. It is recommended not to
change it.
+tune.h2.initial-window-size <number>
+ Sets the HTTP/2 initial window size, which is the number of bytes the client
+ can upload before waiting for an acknowledgement from haproxy. This setting
+ only affects payload contents (ie: the body of POST requests), not headers.
+ The default value is 65535, which roughly allows up to 5 Mbps of upload
+ bandwidth per client over a network showing a 100 ms ping time, or 500 Mbps
+ over a 1-ms local network. It can make sense to increase this value to allow
+ faster uploads, or to reduce it to increase fairness when dealing with many
+ clients. It doesn't affect resource usage.
+
tune.http.cookielen <number>
Sets the maximum length of captured cookies. This is the maximum value that
the "capture cookie xxx len yyy" will be allowed to take, and any upper value
diff --git a/src/mux_h2.c b/src/mux_h2.c
index 3fbac8c..6143d3b 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -18,6 +18,7 @@
/* a few settings from the global section */
static int h2_settings_header_table_size = 4096; /* initial value */
+static int h2_settings_initial_window_size = 65535; /* initial value */
/*****************************************************************/
@@ -146,6 +147,22 @@
return 0;
}
+/* config parser for global "tune.h2.initial-window-size" */
+static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
+ struct proxy *defpx, const char *file, int line,
+ char **err)
+{
+ if (too_many_args(1, args, err, NULL))
+ return -1;
+
+ h2_settings_initial_window_size = atoi(args[1]);
+ if (h2_settings_initial_window_size < 0) {
+ memprintf(err, "'%s' expects a positive numeric value.", args[0]);
+ return -1;
+ }
+ return 0;
+}
+
/****************************************/
/* MUX initialization and instanciation */
@@ -175,6 +192,7 @@
/* config keyword parsers */
static struct cfg_kw_list cfg_kws = {ILH, {
{ CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
+ { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
{ 0, NULL, NULL }
}};