Bug#37385923 routertest_integration_routing_sharing select_overlong times out

postfix for build-failures on windows.

Change-Id: Ide5cc89e95286fad62ad11f89b3f6bfad421d9d4

Author: weigon

router/src/routing/src/channel.cc

@@ -25,6 +25,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 #include "channel.h"
 
+#include <algorithm>  // min
 #include <cassert>
 
 #include <openssl/bio.h>
@@ -237,6 +238,9 @@ stdx::expected<size_t, std::error_code> Channel::read_to_plain(size_t sz) {
   while (sz > 0) {
     // read at most a SSL frame (16k) to avoid excessive resizes.
     //
+    // Without the limitation, a 16Mbyte frame takes 150sec to transfer
+    // if CMAKE_BUILD_TYPE is Debug due to disabled optimizations:
+    //
     //      | Debug    | RelWithDebInfo
     //   1k |  2100ms  | 256ms
     //  16k |  1966ms  | 219ms