From 94b5460c7002ff84cf675977c9b9f4228276ed6b Mon Sep 17 00:00:00 2001
From: Igor Sysoev <igor@sysoev.ru>
Date: Fri, 7 Oct 2011 12:15:20 +0000
Subject: [PATCH] Releasing memory of idle SSL connection. This saves about 34K
 per SSL connection. The SSL_MODE_RELEASE_BUFFERS option is available since
 OpenSSL 1.0.0d.

---
 src/event/ngx_event_openssl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index aa9a4c96a..bbec1db0e 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -179,6 +179,10 @@ ngx_ssl_create(ngx_ssl_t *ssl, ngx_uint_t protocols, void *data)
     SSL_CTX_set_options(ssl->ctx, SSL_OP_NO_COMPRESSION);
 #endif
 
+#ifdef SSL_MODE_RELEASE_BUFFERS
+    SSL_CTX_set_mode(ssl->ctx, SSL_MODE_RELEASE_BUFFERS);
+#endif
+
     SSL_CTX_set_read_ahead(ssl->ctx, 1);
 
     SSL_CTX_set_info_callback(ssl->ctx, ngx_ssl_info_callback);