Hi,
I'm experimenting a little bit with the scheduler library, and I got some
performance numbers which seems to be worse than what I've expected.
I'm sending 64 bytes packets on a 10G interface to a separate thread, and
my simple test program (based on the qos_sched example) does the following:
while (1) {
uint16_t ret = rte_ring_sc_dequeue_burst(it.ring,
(void**)flushbatch, FLUSH_SIZE);
rte_mbuf** t = flushbatch;
if (!ret) {
/* This call is necessary to make sure the TX completed
mbuf's
* are returned to the pool even if there is nothing to
* transmit */
rte_eth_tx_burst(it.portid, lcore, t, 0);
continue;
}
rte_sched_port_enqueue(it.port, flushbatch, ret);
ret = rte_sched_port_dequeue(it.port, flushbatch, FLUSH_SIZE);
while (ret) {
uint16_t n = rte_eth_tx_burst(it.portid, lcore, t, ret);
/* we cannot drop the packets, so re-send */
/* update number of packets to be sent */
ret -= n;
t = &t[n];
};
}
I run this on a separate thread, another one doing rx and feeding the
packets to the ring. When I comment out the enqueue and dequeue part in the
code (reducing it to simple l2fwd), I can forward the entire ~14 Mpps
traffic, whilst with the scheduler enabled I can only reach ~5.4 Mpps at
best. I've tried with a single pipe or with 4k (used rand() to randomly
distribute between pipe, everything else (class etc) was set to 0), didn't
make a difference. Is this expected? I'm running this on a Xeon E5-2630 0 @
2.30GHz
I've used the following configuration:
; port configuration [port]
[port]
frame overhead = 24
number of subports per port = 1
number of pipes per subport = 1024
queue sizes = 64 64 64 64
; Subport configuration
[subport 0]
tb rate = 1250000000; Bytes per second
tb size = 1000000000; Bytes
tc 0 rate = 1250000000; Bytes per second
tc 1 rate = 1250000000; Bytes per second
tc 2 rate = 1250000000; Bytes per second
tc 3 rate = 1250000000; Bytes per second
tc period = 10; Milliseconds
tc oversubscription period = 1000; Milliseconds
pipe 0-1024 = 0; These pipes are configured with pipe profile 0
; Pipe configuration
[pipe profile 0]
tb rate = 1250000000; Bytes per second
tb size = 1000000000; Bytes
tc 0 rate = 1250000000; Bytes per second
tc 1 rate = 1250000000; Bytes per second
tc 2 rate = 1250000000; Bytes per second
tc 3 rate = 1250000000; Bytes per second
tc period = 10; Milliseconds
tc 0 oversubscription weight = 1
tc 1 oversubscription weight = 1
tc 2 oversubscription weight = 1
tc 3 oversubscription weight = 1
tc 0 wrr weights = 1 1 1 1
tc 1 wrr weights = 1 1 1 1
tc 2 wrr weights = 1 1 1 1
tc 3 wrr weights = 1 1 1 1
Regards,
Zoltan
