Hi all
Recently , I run a test two VM commulication with vxlan and
ovs+dpdk networking(ovs2.7.2). when I add 200 virtual device on the physical
service of
the commulicate vm then check the ping result, there is loss packet
statistics. Then I use vlan and ovs+dpdk networking, do the same thing , there
is no loss
packets statistics.
I read the source code and add some log to confirm the problem,
the final problem I think is unreasonable routing refresh, in
route_table_rest function
delete all items before readding, so in the middle of the interval
ovs_router_lookup can not find the route then cause packet drop. So I think
the implementation
need to optimize, Any advice on how to optimize it?
static int
route_table_reset(void)
{
int i = 0;
struct nl_dump dump;
struct rtgenmsg *rtmsg;
uint64_t reply_stub[NL_DUMP_BUFSIZE / 8];
struct ofpbuf request, reply, buf;
route_map_clear(); // clear all route before add
netdev_get_addrs_list_flush();
.............
while (nl_dump_next(&dump, &reply, &buf)) {
struct route_table_msg msg;
if (route_table_parse(&reply, &msg)) {
route_table_handle_msg(&msg); //
add route
i++;
}
}
...............
}
TEST CMD:
ping 192.168.100.100 -i 0.01
for((i=1 ; i <201 ; i++));
do
ip netns add vm$i
ip link add p$i type veth peer name vp$i
ifconfig vp$i up
ip link set p$i netns vm$i
done
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