This patch set implements the 'preferential read' part of the feature of
ingress scheduling described at OvS 2017 Fall Conference
https://www.slideshare.net/LF_OpenvSwitch/lfovs17ingress-scheduling-82280320.
It allows configuration to specify an ingress priority for and entire
interface. This protects traffic on higher priority interfaces from loss and
latency as PMDs get overloaded.
Results so far a are very promising; For a uniform traffic distribution as
total offered load increases loss starts on the lowest priority port first and
the highest priority port last.
When using four physical ports with each port forwarded to one of the other
ports. The following packets loss is seen. The EMC was bypassed in this case
and a small delay loop was added to each packet to simulate more realistic per
packet processing cost of 1000cycles approx.
Port dpdk_0 dpdk_1 dpdk_2 dpdk_3
Traffic
Dist. 25% 25% 25% 25%
Priority 0 1 2 3
n_rxq 8 8 8 8
Total
Load Kpps Loss Rate Per Port (Kpps)
2110 0 0 0 0
2120 5 0 0 0
2920 676 0 0 0
2930 677 5 0 0
3510 854 411 0 0
3520 860 415 3 0
4390 1083 716 348 0
4400 1088 720 354 1
Even in the case where most traffic is on the priority port this remains the
case:
Port dpdk_0 dpdk_1 dpdk_2 dpdk_3
Traffic
Dist. 10% 20% 30% 40%
Priority 0 1 2 3
n_rxq 8 8 8 8
Total
Load Kpps Loss Rate Per Port (Kpps)
2400 0 0 0 0
2410 5 0 0 0
2720 225 5 0 0
2880 252 121 9 0
3030 269 176 82 3
4000 369 377 384 392
5000 471 580 691 801
The latency characteristics of the traffic on the higher priority ports is also
protected.
Port dpdk_0 dpdk_1 dpdk_2 dpdk_3
Traffic
Dist. 10% 20% 30% 40%
Priority 0 1 2 3
n_rxq 8 8 8 8
Total dpdk0 dpdk1 dpdk2 dpdk3
Load Kpps
2400 113 122 120 125
2410 36117 571 577 560
2720 323242 14424 3265 3235
2880 391404 33508 10075 4600
3030 412597 35450 17061 7965
4000 414729 36070 17740 11106
5000 416801 36445 18233 11653
Some General setup notes:
Fortville. (X710 DA4. firmware-version: 6.01 0x800034af 1.1747.0)
Intel(R) Xeon(R) CPU E5-2695 v3 @ 2.30GHz
One pmd
Port fwding port 0<->1, 2 <-> 3
Frame 64B, UDP 221 streams per port.
OvS base - 4c80644 http://github.com/istokes/ovs dpdk_merge_2_9. Added
600cycles approx pkt processing in order to bring per packet cost to ~1000
cycles.
DPDK v17.11.1
Billy O'Mahony (2):
ingress scheduling: schema and docs
ingress scheduling: Provide per interface ingress priority
Documentation/howto/dpdk.rst | 18 ++++++++++++
include/openvswitch/ofp-parse.h | 3 ++
lib/dpif-netdev.c | 47 +++++++++++++++++++++---------
lib/netdev-bsd.c | 1 +
lib/netdev-dpdk.c | 64 +++++++++++++++++++++++++++++++++++++++--
lib/netdev-dummy.c | 1 +
lib/netdev-linux.c | 1 +
lib/netdev-provider.h | 11 ++++++-
lib/netdev-vport.c | 1 +
lib/netdev.c | 23 +++++++++++++++
lib/netdev.h | 2 ++
vswitchd/bridge.c | 2 ++
vswitchd/vswitch.ovsschema | 9 ++++--
vswitchd/vswitch.xml | 40 ++++++++++++++++++++++++++
14 files changed, 205 insertions(+), 18 deletions(-)
--
2.7.4
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