force acoThreadSmooting on Windows

- because without it the async server seems unstable and consumes too much CPU in its R0 thread - see https://synopse.info/forum/viewtopic.php?id=6682
- this is a temporary solution until something better is reported (and needed)
- idea is to use the plain THttpSocketServer on Windows, and use the async code on Linux only (where it seems very stable and efficient)
- writing cross-platform multi-thread IO is hard for sure :)

src/mormot.commit.inc

@@ -1 +1 @@
-'2.1.5794'
+'2.1.5795'

src/net/mormot.net.async.pas

@@ -2201,7 +2201,7 @@ function TAsyncConnections.ThreadClientsConnect: TAsyncConnection;
     FreeAndNil(result);
 end;
 
-// NOTICE on the acoThreadSmooting algorithm (genuine AFAICT)
+// NOTICE on the acoThreadSmooting scheduling algorithm (genuine AFAICT)
 // - in TAsyncConnectionsThread.Execute, the R0/atpReadPoll main thread calls
 // PollForPendingEvents (e.g. the epoll API on Linux) then ThreadPollingWakeup()
 // to process the socket reads in the R1..Rn/atpReadPending threads of the pool
@@ -2223,6 +2223,8 @@ function TAsyncConnections.ThreadClientsConnect: TAsyncConnection;
 // thread is supposed to handle in its loop - default value is computed as
 // (ThreadPoolCount / CpuCount) * 8 so should scale depending on the actual HW
 // - on Linux, waking up threads is done via efficient blocking eventfd()
+// - on Windows, acoThreadSmooting is forced because without it the async
+// server seems unstable and consumes too much CPU in its R0 thread
 
 function TAsyncConnections.ThreadPollingWakeup(Events: integer): PtrInt;
 var
@@ -3645,6 +3647,9 @@ constructor THttpAsyncServer.Create(const aPort: RawUtf8; const OnStart,
   //include(aco, acoWritePollOnly);
   if hsoEnableTls in ProcessOptions then
     include(aco, acoEnableTls);
+  {$ifdef OSWINDOWS}
+  include(ProcessOptions, hsoThreadSmooting); // seems unstable without it
+  {$endif OSWINDOWS}
   if hsoThreadSmooting in ProcessOptions then
     include(aco, acoThreadSmooting)
   else // our thread smooting algorithm excludes CPU affinity