Intro
The present page aims to measure the performance of RPMsg for different number of channels and packet and transfer sizes. This is indicative only and it can vary a lot from implementation to implementation, so use it only as a rough guide.
On the Setup section, there’s examples on how to set up the benchmark and its endpoints, for different number of channels, transfer and packet sizes. Note that this can also vary in terms of device numbering, firmware filenames etc.
On the Benchmarks section, the results table is present for a number of different configurations.
Source code
Source code for rpmsg-examples located at https://github.com/analogdevicesinc/rpmsg-examples, examples are compiled with CCES studio on Windows and copied over to the ADSP-SC598 board.
Setup
Setting up the endpoints
Load firmware to SHARC(s)
Generated file names of ldr files are:
rpmsg_echo_example_Core1.ldr
rpmsg_echo_example_Core2.ldr
Load Core 1 firmware for benchmarking
cd /lib/firmware
echo stop > /sys/class/remoteproc/remoteproc0/state
echo rpmsg_echo_example_Core1.ldr > /sys/class/remoteproc/remoteproc0/firmware
echo start > /sys/class/remoteproc/remoteproc0/state
Bind channels
After firmware loaded and starter, there will be created endpoints under the:
/sys/bus/rpmsg/devices
Bind 1 channel
rpmsg-bind-chardev -p virtio0.sharc-echo.-1. -n 1 -e 288 -s 100
Bind 8 channels
rpmsg-bind-chardev -p virtio0.sharc-echo.-1. -n 8 -e 288 -s 100
Bind 32 channels
rpmsg-bind-chardev -p virtio0.sharc-echo.-1. -n 32 -e 288 -s 100
Test channel(s)
Run 1 channel
rpmsg-xmit-p /dev/rpmsg -n 1 -e 0 -t 1000000
Run 8 channels
rpmsg-xmit-p /dev/rpmsg -n 8 -e 0 -t 1000000
Run 32 channels
rpmsg-xmit-p /dev/rpmsg -n 32 -e 0 -t 1000000
Test different transfer sizes
Run 10k transfers
rpmsg-xmit-p /dev/rpmsg -n 1 -e 0 -t 10000
Run 100k transfers
rpmsg-xmit-p /dev/rpmsg -n 1 -e 0 -t 100000
Run 1M transfers
rpmsg-xmit-p /dev/rpmsg -n 1 -e 0 -t 1000000
Test different packet sizes
Set packet size 1
rpmsg-xmit-p /dev/rpmsg -n 1 -e 0 -t 1000000 -s 1
Set packet size 32
rpmsg-xmit-p /dev/rpmsg -n 1 -e 0 -t 1000000 -s 32
Set packet size 496
rpmsg-xmit-p /dev/rpmsg -n 1 -e 0 -t 1000000 -s 496
Benchmarks
1 Channel
PACKET SIZE |
TRANSFER SIZE |
Single CH speed |
|---|---|---|
1 |
100 |
14593 |
10000 |
14429 |
|
100000 |
14554 |
|
1000000 |
14521 |
|
10000000 |
14627 |
|
2 |
100 |
29262 |
10000 |
29015 |
|
100000 |
28722 |
|
1000000 |
28828 |
|
10000000 |
29160 |
|
16 |
100 |
244307 |
10000 |
233222 |
|
100000 |
227375 |
|
1000000 |
228350 |
|
10000000 |
228385 |
|
64 |
100 |
839190 |
10000 |
855061 |
|
100000 |
833525 |
|
1000000 |
824475 |
|
10000000 |
821174 |
|
256 |
100 |
2611392 |
10000 |
2498536 |
|
100000 |
2314672 |
|
1000000 |
2290975 |
|
10000000 |
2278242 |
|
496 |
100 |
4598496 |
10000 |
4904841 |
|
100000 |
5318444 |
|
1000000 |
5358093 |
|
10000000 |
5402480 |
8 Channels
PACKET SIZE |
TRANSFER SIZE |
Single CH speed |
Average CH Speed |
|---|---|---|---|
1 |
100 |
15383 |
1923 |
10000 |
15379 |
1922 |
|
100000 |
15325 |
1916 |
|
2 |
100 |
18300 |
2288 |
10000 |
28289 |
3536 |
|
100000 |
29352 |
3669 |
|
1000000 |
29794 |
3724 |
|
16 |
100 |
251359 |
31420 |
10000 |
232645 |
29081 |
|
100000 |
237663 |
29708 |
|
1000000 |
245774 |
30722 |
|
10000000 |
236035 |
29504 |
|
64 |
100 |
1514642 |
189330 |
10000 |
1061882 |
132735 |
|
100000 |
1010483 |
126310 |
|
1000000 |
957566 |
119696 |
|
10000000 |
997557 |
124695 |
|
256 |
100 |
5835056 |
729382 |
10000 |
4184189 |
523024 |
|
100000 |
3407874 |
425984 |
|
1000000 |
3532256 |
441532 |
|
10000000 |
2505826 |
313228 |
|
496 |
100 |
12892509 |
1611564 |
10000 |
8742713 |
1092839 |
|
100000 |
7078932 |
884867 |
|
1000000 |
7143015 |
892877 |
|
10000000 |
7184777 |
898097 |
32 Channels
PACKET SIZE |
TRANSFER SIZE |
Single CH speed |
Average CH Speed |
|---|---|---|---|
1 |
100 |
12464 |
390 |
10000 |
12790 |
400 |
|
100000 |
12775 |
399 |
|
2 |
100 |
26479 |
827 |
10000 |
25364 |
793 |
|
100000 |
25339 |
792 |
|
16 |
100 |
351299 |
10978 |
10000 |
205900 |
6434 |
|
100000 |
197167 |
6161 |
|
64 |
100 |
13584233 |
424507 |
10000 |
877851 |
27433 |
|
100000 |
753868 |
23558 |
|
1000000 |
742513 |
23204 |
|
256 |
100 |
23018872 |
719340 |
10000 |
8198836 |
256214 |
|
100000 |
2925997 |
91437 |
|
1000000 |
2768895 |
86528 |
|
10000000 |
25052788426826 |
87138 |
|
496 |
100 |
44478888 |
1389965 |
10000 |
33994508 |
1062328 |
|
100000 |
6907303 |
215853 |
|
1000000 |
6170902 |
192841 |
|
10000000 |
6076338 |
189886 |
Notes
For channels=1 & packet size=1, it’s easy to observer that the maximum number of packets per second is 12-15k, and the bandwidth linearly follows the increase to the maximum 496 bytes. All other (multi-channel) benchmark numbers seem to follow the same pattern, i.e. the total bandwidth stays similar, and the bandwidth per channel drops as channels are added.
No changes were made to tune RPMsg-lite
Moving Vring to DDR reduces the performance by approximately 10-20%
Benchmark Plots
Single Channel Performance
Bandwidth per channel for different number of total channels
Total Bandwidth
Total bandwidth for different number of total channels