[PATCH 4 of 4] Changed default value of sendfile_max_chunk to 2m

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1633978667 -10800
#      Mon Oct 11 21:57:47 2021 +0300
# Node ID a6426f166fa41d23040e5b3aefb2d6340c10a53c
# Parent  c7ef6ce9455b01ee1fdcfd7288c4ac5b3ef0de41
Changed default value of sendfile_max_chunk to 2m.

The "sendfile_max_chunk" directive is important to prevent worker
monopolization by fast connections.  The 2m value implies maximum 200ms
delay with 100 Mbps links, 20ms delay with 1 Gbps links, and 2ms on
10 Gbps links.  It is also seems to be a good value for disks.

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -3720,7 +3720,7 @@ ngx_http_core_merge_loc_conf(ngx_conf_t 
     ngx_conf_merge_value(conf->internal, prev->internal, 0);
     ngx_conf_merge_value(conf->sendfile, prev->sendfile, 0);
     ngx_conf_merge_size_value(conf->sendfile_max_chunk,
-                              prev->sendfile_max_chunk, 0);
+                              prev->sendfile_max_chunk, 2 * 1024 * 1024);
     ngx_conf_merge_size_value(conf->subrequest_output_buffer_size,
                               prev->subrequest_output_buffer_size,
                               (size_t) ngx_pagesize);