Signed-off-by: Jiayu Hu <>
 doc/guides/testpmd_app_ug/testpmd_funcs.rst | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst 
index 2ed62f5..bc8f7f8 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -903,7 +903,7 @@ gro
 Enable or disable GRO in ``csum`` forwarding engine::
-   testpmd> gro (on|off) (port_id)
+   testpmd> gro (heavymode|lightmode) (on|off) (port_id)
 If enabled, the csum forwarding engine will perform GRO on the TCP/IPv4
 packets received from the given port.
@@ -932,6 +932,18 @@ number of packets a GRO table can store.
 If current packet number is greater than or equal to the max value, GRO
 will stop processing incoming packets.
+gro flush interval
+Set the interval of flushing GROed packets from reassembly tables::
+   testpmd> gro flush interval (num)
+In the heavyweight mode, GROed packets are flushed from the reassembly
+tables and sent out when perform GRO every ``num`` times.
+The value of ``num`` should be in the range of 0 to ``GRO_MAX_FLUSH_INTERVAL``.
 mac_addr add

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