diff --git a/io/epoll.cpp b/io/epoll.cpp
index a45ec09f..487aaf63 100644
--- a/io/epoll.cpp
+++ b/io/epoll.cpp
@@ -203,11 +203,8 @@ ok:     entry.interests |= eint;
     int do_epoll_wait(uint64_t timeout) {
         assert(_events_remain == 0);
         uint8_t cool_down_ms = 1;
-        // since timeout may less than 1ms
-        // in such condition, timeout_ms should be at least 1
-        // or it may call epoll_wait without any idle
-        timeout = (timeout && timeout < 1024) ? 1 : timeout / 1024;
-        timeout &= 0x7fffffff;  // make sure less than INT32_MAX
+        // epoll_wait 0ms should be OK, make sure less than INT32_MAX
+        timeout = (timeout / 1000) & 0x7fffffff;  
         while (_engine_fd > 0) {
             int ret = ::epoll_wait(_engine_fd, _events, LEN(_events), timeout);
             if (ret < 0) {