diff --git a/src/components/tl/ucp/alltoall/alltoall_ca.c b/src/components/tl/ucp/alltoall/alltoall_ca.c
index a9c3bc5a5c..9511da3101 100644
--- a/src/components/tl/ucp/alltoall/alltoall_ca.c
+++ b/src/components/tl/ucp/alltoall/alltoall_ca.c
@@ -11,12 +11,16 @@
 #include "utils/ucc_math.h"
 #include "tl_ucp_sendrecv.h"
 
+/* update when pinger rtt complete */
+#define MAGIC_NUMBER    1.0
+
 void ucc_tl_ucp_alltoall_onesided_ca_progress(ucc_coll_task_t *ctask);
 
 ucc_status_t ucc_tl_ucp_alltoall_onesided_ca_start(ucc_coll_task_t *ctask)
 {
     ucc_tl_ucp_task_t *task   = ucc_derived_of(ctask, ucc_tl_ucp_task_t);
     ucc_tl_ucp_team_t *team   = TASK_TEAM(task);
+    ucc_tl_ucp_context_t *ctx            = UCC_TL_UCP_TEAM_CTX(team);
     ptrdiff_t          src    = (ptrdiff_t)TASK_ARGS(task).src.info.buffer;
     ptrdiff_t          dest   = (ptrdiff_t)TASK_ARGS(task).dst.info.buffer;
     size_t             nelems = TASK_ARGS(task).src.info.count;
@@ -24,6 +28,10 @@ ucc_status_t ucc_tl_ucp_alltoall_onesided_ca_start(ucc_coll_task_t *ctask)
     ucc_rank_t         gsize  = UCC_TL_TEAM_SIZE(team);
     ucc_rank_t         start  = (grank + 1) % gsize;
     long *             pSync  = TASK_ARGS(task).global_work_buffer;
+    int                revisit[128] = {0};
+    int                nr_revisit = 0;
+    int nr_revisit_max = 0;
+    pinger_rtt_t       rtt;
     ucc_rank_t         peer;
 
     ucc_tl_ucp_task_reset(task, UCC_INPROGRESS);
@@ -33,11 +41,34 @@ ucc_status_t ucc_tl_ucp_alltoall_onesided_ca_start(ucc_coll_task_t *ctask)
 
     /* maybe have a list of processes to send to, cut them out of the process list */
     for (peer = start; task->onesided.put_posted < gsize; peer = (peer + 1) % gsize) {
-        UCPCHECK_GOTO(ucc_tl_ucp_put_nb((void *)(src + peer * nelems),
-                                        (void *)dest, nelems, peer, team, task),
-                      task, out);
-        UCPCHECK_GOTO(ucc_tl_ucp_atomic_inc(pSync, peer, team), task,
-                      out);
+        pinger_query(ctx->pinger, ctx->pinger_peer[peer], &rtt);
+        if (rtt <= MAGIC_NUMBER) {
+            UCPCHECK_GOTO(ucc_tl_ucp_put_nb((void *)(src + peer * nelems),
+                                            (void *)dest, nelems, peer, team, task),
+                          task, out);
+            UCPCHECK_GOTO(ucc_tl_ucp_atomic_inc(pSync, peer, team), task,
+                          out);
+        } else {
+            revisit[nr_revisit++] = peer;
+        }
+    }
+
+    while (nr_revisit) {
+        nr_revisit_max = nr_revisit;
+        nr_revisit = 0;
+        for (int i = 0; i < nr_revisit_max; i++) {
+            peer = revisit[i];
+            pinger_query(ctx->pinger, ctx->pinger_peer[peer], &rtt);
+            if (rtt <= MAGIC_NUMBER) {
+                UCPCHECK_GOTO(ucc_tl_ucp_put_nb((void *)(src + peer * nelems),
+                                            (void *)dest, nelems, peer, team, task),
+                          task, out);
+                UCPCHECK_GOTO(ucc_tl_ucp_atomic_inc(pSync, peer, team), task,
+                          out);
+            } else {
+                revisit[nr_revisit++] = peer;
+            }
+        }
     }
 
     return ucc_progress_queue_enqueue(UCC_TL_CORE_CTX(team)->pq, &task->super);