From 8b03ce562c1fe075d3321b3f014c27fea0332ee0 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@gmail.com>
Date: Thu, 4 Jan 2024 17:56:29 +0100
Subject: [PATCH] input/curl: increase CURLOPT_BUFFERSIZE from 16 kB to 512 kB

---
 src/input/plugins/CurlInputPlugin.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/input/plugins/CurlInputPlugin.cxx b/src/input/plugins/CurlInputPlugin.cxx
index b5660c3ad..4cee498e0 100644
--- a/src/input/plugins/CurlInputPlugin.cxx
+++ b/src/input/plugins/CurlInputPlugin.cxx
@@ -460,6 +460,11 @@ CreateEasy(const char *url, struct curl_slist *headers)
 {
 	CurlEasy easy{url};
 
+	/* increase CURL's receive buffer size from 16 kB to 512 kB
+	   (the maximum until CURL 7.88.0) to reduce system call
+	   overhead */
+	easy.TrySetOption(CURLOPT_BUFFERSIZE, 512L * 1024L);
+
 	easy.SetOption(CURLOPT_HTTP200ALIASES, http_200_aliases);
 	easy.SetOption(CURLOPT_FOLLOWLOCATION, 1L);
 	easy.SetOption(CURLOPT_MAXREDIRS, 5L);