From 73678216eaae919068c163305d343cfd118c1128 Mon Sep 17 00:00:00 2001
From: Igor Sysoev <igor@sysoev.ru>
Date: Tue, 27 Nov 2007 12:24:44 +0000
Subject: [PATCH] improve throughput with large limit_rate

---
 src/http/ngx_http_write_filter_module.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/http/ngx_http_write_filter_module.c b/src/http/ngx_http_write_filter_module.c
index e5a26f003..bc62b1817 100644
--- a/src/http/ngx_http_write_filter_module.c
+++ b/src/http/ngx_http_write_filter_module.c
@@ -49,6 +49,7 @@ ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
 {
     off_t                      size, sent, limit;
     ngx_uint_t                 last, flush;
+    ngx_msec_t                 delay;
     ngx_chain_t               *cl, *ln, **ll, *chain;
     ngx_connection_t          *c;
     ngx_http_core_loc_conf_t  *clcf;
@@ -245,14 +246,17 @@ ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
     }
 
     if (r->limit_rate) {
-        sent = c->sent - sent;
-        c->write->delayed = 1;
-        ngx_add_timer(c->write, (ngx_msec_t) (sent * 1000 / r->limit_rate + 1));
+        delay = (ngx_msec_t) ((c->sent - sent) * 1000 / r->limit_rate + 1);
+
+        if (delay > 0) {
+            c->write->delayed = 1;
+            ngx_add_timer(c->write, delay);
+        }
 
     } else if (c->write->ready
                && clcf->sendfile_max_chunk
                && (size_t) (c->sent - sent)
-                                >= clcf->sendfile_max_chunk - 2 * ngx_pagesize)
+                      >= clcf->sendfile_max_chunk - 2 * ngx_pagesize)
     {
         c->write->delayed = 1;
         ngx_add_timer(c->write, 1);