diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index 187fa85e9..adb3eeb5f 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -65,6 +65,9 @@ SrsPps* _srs_pps_twcc = new SrsPps(_srs_clock);
 SrsPps* _srs_pps_rr = new SrsPps(_srs_clock);
 SrsPps* _srs_pps_pub = new SrsPps(_srs_clock);
 
+extern SrsPps* _srs_pps_snack;
+extern SrsPps* _srs_pps_snack2;
+
 #define SRS_TICKID_RTCP 0
 #define SRS_TICKID_TWCC 2
 
@@ -2281,6 +2284,8 @@ srs_error_t SrsRtcConnection::send_rtcp(char *data, int nb_data)
 
 void SrsRtcConnection::check_send_nacks(SrsRtpNackForReceiver* nack, uint32_t ssrc, uint32_t& sent_nacks, uint32_t& timeout_nacks)
 {
+    ++_srs_pps_snack->sugar;
+
     SrsRtcpNack rtcpNack(ssrc);
 
     rtcpNack.set_media_ssrc(ssrc);
@@ -2291,6 +2296,8 @@ void SrsRtcConnection::check_send_nacks(SrsRtpNackForReceiver* nack, uint32_t ss
         return;
     }
 
+    ++_srs_pps_snack2->sugar;
+
     char buf[kRtcpPacketSize];
     SrsBuffer stream(buf, sizeof(buf));
 
diff --git a/trunk/src/app/srs_app_rtc_server.cpp b/trunk/src/app/srs_app_rtc_server.cpp
index de9f11df4..6092e8be1 100644
--- a/trunk/src/app/srs_app_rtc_server.cpp
+++ b/trunk/src/app/srs_app_rtc_server.cpp
@@ -60,6 +60,11 @@ extern SrsPps* _srs_pps_rr;
 extern SrsPps* _srs_pps_timer;
 extern SrsPps* _srs_pps_pub;
 
+extern SrsPps* _srs_pps_snack;
+extern SrsPps* _srs_pps_snack2;
+extern SrsPps* _srs_pps_sanack;
+extern SrsPps* _srs_pps_svnack;
+
 SrsRtcBlackhole::SrsRtcBlackhole()
 {
     blackhole = false;
@@ -663,14 +668,16 @@ srs_error_t SrsRtcServer::notify(int type, srs_utime_t interval, srs_utime_t tic
     _srs_pps_ids->update(); _srs_pps_fids->update(); _srs_pps_fids_level0->update();
     _srs_pps_pli->update(); _srs_pps_twcc->update(); _srs_pps_rr->update();
     _srs_pps_timer->update(); _srs_pps_pub->update();
+    _srs_pps_snack->update(); _srs_pps_snack2->update(); _srs_pps_sanack->update(); _srs_pps_svnack->update();
 
     // TODO: FIXME: Show more data for RTC server.
-    srs_trace("RTC: Server conns=%u, cpu=%.2f%%, rss=%dMB, pkts=%d, addrs=%d,%d, fid=%d,%d,%d, rtcp=%d,%d,%d, timer=%d,%d",
+    srs_trace("RTC: Server conns=%u, cpu=%.2f%%, rss=%dMB, pkts=%d, addrs=%d,%d, fid=%d,%d,%d, rtcp=%d,%d,%d, timer=%d,%d, nack=%d,%d,%d,%d",
         nn_rtc_conns, u->percent * 100, memory,
         _srs_pps_pkts->r10s(), _srs_pps_addrs->r10s(), _srs_pps_fast_addrs->r10s(),
         _srs_pps_ids->r10s(), _srs_pps_fids->r10s(), _srs_pps_fids_level0->r10s(),
         _srs_pps_pli->r10s(), _srs_pps_twcc->r10s(), _srs_pps_rr->r10s(),
         _srs_pps_timer->r10s(), _srs_pps_pub->r10s()
+        _srs_pps_snack->r10s(), _srs_pps_snack2->r10s(), _srs_pps_sanack->r10s(), _srs_pps_svnack->r10s()
     );
 
     return err;
diff --git a/trunk/src/app/srs_app_rtc_source.cpp b/trunk/src/app/srs_app_rtc_source.cpp
index 020d139ff..8ebf76eef 100644
--- a/trunk/src/app/srs_app_rtc_source.cpp
+++ b/trunk/src/app/srs_app_rtc_source.cpp
@@ -48,6 +48,14 @@
 #include <srs_app_rtc_codec.hpp>
 #endif
 
+#include <srs_protocol_kbps.hpp>
+
+// The NACK sent by us(SFU).
+SrsPps* _srs_pps_snack = new SrsPps(_srs_clock);
+SrsPps* _srs_pps_snack2 = new SrsPps(_srs_clock);
+SrsPps* _srs_pps_sanack = new SrsPps(_srs_clock);
+SrsPps* _srs_pps_svnack = new SrsPps(_srs_clock);
+
 // Firefox defaults as 109, Chrome is 111.
 const int kAudioPayloadType     = 111;
 const int kAudioChannel         = 2;
@@ -1868,6 +1876,8 @@ srs_error_t SrsRtcAudioRecvTrack::check_send_nacks()
 {
     srs_error_t err = srs_success;
 
+    ++_srs_pps_sanack->sugar;
+
     uint32_t timeout_nacks = 0;
     if ((err = do_check_send_nacks(timeout_nacks)) != srs_success) {
         return srs_error_wrap(err, "audio");
@@ -1931,6 +1941,8 @@ srs_error_t SrsRtcVideoRecvTrack::check_send_nacks()
 {
     srs_error_t err = srs_success;
 
+    ++_srs_pps_svnack->sugar;
+
     uint32_t timeout_nacks = 0;
     if ((err = do_check_send_nacks(timeout_nacks)) != srs_success) {
         return srs_error_wrap(err, "video");