>diff --git a/utilities/ovs-tcpdump.in b/utilities/ovs-tcpdump.in
>index 187eafdf25..2070678b3a 100755
>--- a/utilities/ovs-tcpdump.in
>+++ b/utilities/ovs-tcpdump.in
>@@ -421,13 +421,16 @@ def py_which(executable):
> for path in os.environ["PATH"].split(os.pathsep))
>-def teardown(db_sock, interface, mirror_interface, tap_created):
>+def teardown(db_sock, interface, mirror_interface, tap_created,
>+ created_mirror):
> def cleanup_mirror():
> try:
> ovsdb = OVSDB(db_sock)
> ovsdb.destroy_mirror(interface, ovsdb.port_bridge(interface))
>- ovsdb.destroy_port(mirror_interface, ovsdb.port_bridge(interface))
>- if tap_created is True:
>+ if created_mirror:
>+ ovsdb.destroy_port(mirror_interface,
>+ ovsdb.port_bridge(interface))
>+ if tap_created:
> _del_taps[sys.platform](mirror_interface)
> except Exception:
> print("Unable to tear down the ports and mirrors.")
>@@ -505,15 +508,21 @@ def main():
> if sys.platform in _make_mirror_name:
> mirror_interface = _make_mirror_name[sys.platform](interface)
>+ created_mirror = True
> if sys.platform in _make_taps and \
>- mirror_interface not in interfaces():
>+ mirror_interface not in interfaces() and \
>+ not ovsdb.port_exists(mirror_interface):
> _make_taps[sys.platform](mirror_interface,
> ovsdb.interface_mtu(interface))
> tap_created = True
> else:
>+ if mirror_interface in interfaces() or \
>+ ovsdb.port_exists(mirror_interface):
>+ created_mirror = False
> tap_created = False
>- if mirror_interface not in interfaces():
>+ if mirror_interface not in interfaces() and \
>+ not ovsdb.port_exists(mirror_interface):
> print("ERROR: Please create an interface called `%s`" %
> mirror_interface)
> print("See your OS guide for how to do this.")
>@@ -524,15 +533,12 @@ def main():
> if not ovsdb.port_exists(interface):
> print("ERROR: Port %s does not exist." % interface)
> sys.exit(1)
>- if ovsdb.port_exists(mirror_interface):
>- print("ERROR: Mirror port (%s) exists for port %s." %
>- (mirror_interface, interface))
>- sys.exit(1)
>- teardown(db_sock, interface, mirror_interface, tap_created)
>+ teardown(db_sock, interface, mirror_interface, tap_created,
>created_mirror)
> try:
>- ovsdb.make_port(mirror_interface, ovsdb.port_bridge(interface))
>+ if created_mirror:
>+ ovsdb.make_port(mirror_interface, ovsdb.port_bridge(interface))
> ovsdb.bridge_mirror(interface, mirror_interface,
> ovsdb.port_bridge(interface),
> mirror_select_all, mirror_filter=mirror_filter)
Hi, I conducted a detailed verification and comparison. I sent 20G of TCP
traffic to OVS-DPDK.
When capturing directly on the vhost-user interface using:
ovs-tcpdump -i vh-userclient-08a1f95c-3b -w test.pcap
the performance dropped to around 17G.
However, unfortunately, when using mirror-to to a virtio-user interface:
ovs-tcpdump -i vh-userclient-08a1f95c-3b --mirror-to veth1 -w test.pcap
the performance dropped significantly to around 11G.
This is quite strange. I'm not sure if the performance drop is caused by the
mirroring mechanism itself. Any thoughts?
Jun Wang
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