MINOR: h2: expose tune.h2.max-concurrent-streams to limit the number of streams
This will be advertised in the settings frame.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index e64cd32..8ac1fb6 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -601,6 +601,7 @@
- tune.comp.maxlevel
- tune.h2.header-table-size
- tune.h2.initial-window-size
+ - tune.h2.max-concurrent-streams
- tune.http.cookielen
- tune.http.logurilen
- tune.http.maxhdr
@@ -1386,6 +1387,15 @@
faster uploads, or to reduce it to increase fairness when dealing with many
clients. It doesn't affect resource usage.
+tune.h2.max-concurrent-streams <number>
+ Sets the HTTP/2 maximum number of concurrent streams per connection (ie the
+ number of outstanding requests on a single connection). The default value is
+ 100. A larger one may slightly improve page load time for complex sites when
+ visited over high latency networks, but increases the amount of resources a
+ single client may allocate. A value of zero disables the limit so a single
+ client may create as many streams as allocatable by haproxy. It is highly
+ recommended not to change this value.
+
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 6143d3b..ff870a1 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -19,6 +19,7 @@
/* 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 */
+static int h2_settings_max_concurrent_streams = 100;
/*****************************************************************/
@@ -163,6 +164,22 @@
return 0;
}
+/* config parser for global "tune.h2.max-concurrent-streams" */
+static int h2_parse_max_concurrent_streams(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_max_concurrent_streams = atoi(args[1]);
+ if (h2_settings_max_concurrent_streams < 0) {
+ memprintf(err, "'%s' expects a positive numeric value.", args[0]);
+ return -1;
+ }
+ return 0;
+}
+
/****************************************/
/* MUX initialization and instanciation */
@@ -193,6 +210,7 @@
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 },
+ { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
{ 0, NULL, NULL }
}};