From 4274decb62daca78c9d43a025fc08f8d6fd3a341 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sun, 14 Jul 2013 17:33:24 +0200
Subject: [PATCH] curl_easy_perform: gradually increase the delay time

Instead of going 50,100,150 etc millisecond delay time when nothing has
been found to do or wait for, we now start lower and double each loop as
in 4,8,16,32 etc.

This lowers the minimum wait without sacrifizing the longer wait too
much with unnecessary CPU cycles burnt.

Bug: http://curl.haxx.se/mail/lib-2013-07/0103.html
Reported-by: Andreas Malzahn

[upstream commit d529f3882b9bca2c3eb32295dd6b2609d0c9b51f]

Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
 lib/easy.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/lib/easy.c b/lib/easy.c
index a7051dd..13801b2 100644
--- a/lib/easy.c
+++ b/lib/easy.c
@@ -465,9 +465,7 @@ CURLcode curl_easy_perform(CURL *easy)
         if(curlx_tvdiff(after, before) <= 10) {
           without_fds++;
           if(without_fds > 2) {
-            int sleep_ms = without_fds * 50;
-            if(sleep_ms > 1000)
-              sleep_ms = 1000;
+            int sleep_ms = without_fds < 10 ? (1 << (without_fds-1)): 1000;
             Curl_wait_ms(sleep_ms);
           }
         }
-- 
1.9.3