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diff src/event/ngx_event_openssl.h @ 8078:5244d3b165ff

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SSL: single allocation in session cache on 32-bit platforms. Given the present typical SSL session sizes, on 32-bit platforms it is now beneficial to store all data in a single allocation, since rbtree node + session id + ASN1 representation of a session takes 256 bytes of shared memory (36 + 32 + 150 = about 218 bytes plus SNI server name). Storing all data in a single allocation is beneficial for SNI names up to about 40 characters long and makes it possible to store about 4000 sessions in one megabyte (instead of about 3000 sessions now). This also slightly simplifies the code.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 12 Oct 2022 20:14:40 +0300
parents 38c71f9b2293
children bf02161f291e
line wrap: on
line diff
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -134,14 +134,14 @@ typedef struct ngx_ssl_sess_id_s  ngx_ss
 
 struct ngx_ssl_sess_id_s {
     ngx_rbtree_node_t           node;
-    u_char                     *id;
     size_t                      len;
-    u_char                     *session;
     ngx_queue_t                 queue;
     time_t                      expire;
+    u_char                      id[32];
 #if (NGX_PTR_SIZE == 8)
-    void                       *stub;
-    u_char                      sess_id[32];
+    u_char                     *session;
+#else
+    u_char                      session[1];
 #endif
 };