nginx 0.3.27 *) Change: the "variables_hash_max_size" and "variables_hash_bucket_size" directives. *) Feature: the $body_bytes_sent variable can be used not only in the "log_format" directive. *) Feature: the $ssl_protocol and $ssl_cipher variables. *) Feature: the cache line size detection for widespread CPUs at start time. *) Feature: now the "accept_mutex" directive is supported using fcntl(2) on platforms different from i386, amd64, sparc64, and ppc. *) Feature: the "lock_file" directive and the --with-lock-path=PATH autoconfiguration directive. *) Bugfix: if the HTTPS protocol was used in the "proxy_pass" directive then the requests with the body was not transferred.

--- a/src/os/unix/ngx_gcc_atomic_x86.h
+++ b/src/os/unix/ngx_gcc_atomic_x86.h
@@ -118,3 +118,6 @@ ngx_atomic_fetch_add(ngx_atomic_t *value
  */
 
 #define ngx_memory_barrier()    __asm__ volatile ("" ::: "memory")
+
+/* old as does not support "pause" opcode */
+#define ngx_cpu_pause()         __asm__ (".byte 0xf3, 0x90")