Index: libcfa/src/concurrency/io.cfa
===================================================================
--- libcfa/src/concurrency/io.cfa	(revision ae7adbc42eb2ac404f2a9a776b44ffdb54929317)
+++ libcfa/src/concurrency/io.cfa	(revision 21a5bfb7aa47de48d1ceaac199ed25291ef03b83)
@@ -144,34 +144,38 @@
 		__ioarbiter_flush( ctx );
 
-		__STATS__( true, io.calls.flush++; )
-		int ret = syscall( __NR_io_uring_enter, ctx.fd, ctx.sq.to_submit, min_comp, min_comp > 0 ? IORING_ENTER_GETEVENTS : 0, (sigset_t *)0p, _NSIG / 8);
-		if( ret < 0 ) {
-			switch((int)errno) {
-			case EAGAIN:
-			case EINTR:
-			case EBUSY:
-				// Update statistics
-				__STATS__( false, io.calls.errors.busy ++; )
-				return false;
-			default:
-				abort( "KERNEL ERROR: IO_URING SYSCALL - (%d) %s\n", (int)errno, strerror(errno) );
+		if(ctx.sq.to_submit != 0 || min_comp > 0) {
+
+			__STATS__( true, io.calls.flush++; )
+			int ret = syscall( __NR_io_uring_enter, ctx.fd, ctx.sq.to_submit, min_comp, min_comp > 0 ? IORING_ENTER_GETEVENTS : 0, (sigset_t *)0p, _NSIG / 8);
+			if( ret < 0 ) {
+				switch((int)errno) {
+				case EAGAIN:
+				case EINTR:
+				case EBUSY:
+					// Update statistics
+					__STATS__( false, io.calls.errors.busy ++; )
+					return false;
+				default:
+					abort( "KERNEL ERROR: IO_URING SYSCALL - (%d) %s\n", (int)errno, strerror(errno) );
+				}
 			}
-		}
-
-		__cfadbg_print_safe(io, "Kernel I/O : %u submitted to io_uring %d\n", ret, ctx.fd);
-		__STATS__( true, io.calls.submitted += ret; )
-		/* paranoid */ verify( ctx.sq.to_submit <= *ctx.sq.num );
-		/* paranoid */ verify( ctx.sq.to_submit >= ret );
-
-		ctx.sq.to_submit -= ret;
-
-		/* paranoid */ verify( ctx.sq.to_submit <= *ctx.sq.num );
-
-		// Release the consumed SQEs
-		__release_sqes( ctx );
-
-		/* paranoid */ verify( ! __preemption_enabled() );
-
-		ctx.proc->io.pending = false;
+
+			__cfadbg_print_safe(io, "Kernel I/O : %u submitted to io_uring %d\n", ret, ctx.fd);
+			__STATS__( true, io.calls.submitted += ret; )
+			/* paranoid */ verify( ctx.sq.to_submit <= *ctx.sq.num );
+			/* paranoid */ verify( ctx.sq.to_submit >= ret );
+
+			ctx.sq.to_submit -= ret;
+
+			/* paranoid */ verify( ctx.sq.to_submit <= *ctx.sq.num );
+
+			// Release the consumed SQEs
+			__release_sqes( ctx );
+
+			/* paranoid */ verify( ! __preemption_enabled() );
+
+			ctx.proc->io.pending = false;
+		}
+
 		ready_schedule_lock();
 		bool ret = __cfa_io_drain( proc );