Thomas, many thanks for sending this.
Few comments and questions after reading the slides:
1. s3 clarification - host and data plane thread setup - vswitch pmd (data
plane) thread placement
a. "1PMD/core (4 core)” - HT (SMT) disabled, 4 phy cores used for vswitch,
each with data plane thread.
b. “2PMD/core (2 core)” - HT (SMT) enabled, 2 phy cores, 4 logical cores
used for vswitch, each with data plane thread.
c. in both cases each data plane thread handling a single interface - 2*
physical, 2* vhost => 4 threads, all busy.
d. in both cases frames are dropped by vswitch or in vring due to vswitch
not keeping up - IOW testpmd in kvm guest is not DUT.
2. s3 question - vswitch setup - it is unclear what is the forwarding mode of
each vswitch, as only srcIp changed in flows
a. flow or MAC learning mode?
b. port to port crossconnect?
3. s3 comment - host and data plane thread setup
a. “2PMD/core (2 core)” case - thread placement may yield different results
- physical interface threads as siblings vs.
- physical and virtual interface threads as siblings.
b. "1PMD/core (4 core)” - one would expect these to be much higher than
“2PMD/core (2 core)”
- speculation: possibly due to "instruction load" imbalance between
threads.
- two types of thread with different "instruction load": phy->vhost vs.
vhost->phy
- "instruction load" = instr/pkt, instr/cycle (IPC efficiency).
4. s4 comment - results look as expected for vpp
5. s5 question - unclear why throughput doubled
a. e.g. for vpp from "11.16 Mpps" to "22.03 Mpps"
b. if only queues increased, and cpu resources did not, or have they?
6. s6 question - similar to point 5. - unclear cpu and thread reasources.
7. s7 comment - anomaly for 3q (virtio multi-queue) for (srcMAc,dstMAC)
a. could be due to flow hashing inefficiency.
-Maciek
On 15 Feb 2017, at 17:34, Thomas F Herbert
<therb...@redhat.com<mailto:therb...@redhat.com>> wrote:
Here are test results on VPP 17.01 compared with OVS/DPDK 2.6/1611 performed by
Karl Rister of Red Hat.
This is PVP testing with 1, 2 and 3 queues. It is an interesting comparison
with the CSIT results. Of particular interest is the drop off on the 3 queue
results.
--TFH
--
Thomas F Herbert
SDN Group
Office of Technology
Red Hat
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