On LinkIt Smart 7688 running OpenWRT.
2 minutes, not playing sound, watching using ssh
# ./cyclictest -t5 -p 80 -n -i 1000
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 0.23 0.30 0.18 1/46 2363
T: 0 ( 2149) P:80 I:1000 C: 115815 Min: 5 Act: 51 Avg: 22 Max: 1897
T: 1 ( 2150) P:80 I:1500 C: 77211 Min: 5 Act: 8 Avg: 23 Max: 1546
T: 2 ( 2151) P:80 I:2000 C: 57909 Min: 6 Act: 9 Avg: 26 Max: 1450
T: 3 ( 2152) P:80 I:2500 C: 46327 Min: 7 Act: 9 Avg: 25 Max: 747
T: 4 ( 2153) P:80 I:3000 C: 38606 Min: 7 Act: 9 Avg: 27 Max: 107
2 minutes, playing wav sound using aplay, watching using ssh
# ./cyclictest -t5 -p 80 -n -i 1000
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 0.13 0.20 0.16 1/46 2716
T: 0 ( 2541) P:80 I:1000 C: 93979 Min: 5 Act: 10 Avg: 34 Max: 8394
T: 1 ( 2542) P:80 I:1500 C: 62694 Min: 5 Act: 9 Avg: 39 Max: 8398
T: 2 ( 2543) P:80 I:2000 C: 47053 Min: 7 Act: 9 Avg: 46 Max: 8268
T: 3 ( 2544) P:80 I:2500 C: 37668 Min: 7 Act: 10 Avg: 49 Max: 8068
T: 4 ( 2545) P:80 I:3000 C: 31409 Min: 8 Act: 34 Avg: 54 Max: 8415
~2 minutes, decoding mp3 file using madplay, one ssh session for madplay and one for cyclictest (!!)
# ./cyclictest -t5 -p 80 -n -i 10000
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 0.12 0.19 0.21 1/51 4043
T: 0 ( 3850) P:80 I:10000 C: 10314 Min: 8 Act: 12 Avg: 31 Max: 816
T: 1 ( 3851) P:80 I:10500 C: 9823 Min: 8 Act: 19 Avg: 31 Max: 519
T: 2 ( 3852) P:80 I:11000 C: 9377 Min: 8 Act: 19 Avg: 30 Max: 716
T: 3 ( 3853) P:80 I:11500 C: 8969 Min: 9 Act: 30 Avg: 32 Max: 422
T: 4 ( 3854) P:80 I:12000 C: 8595 Min: 8 Act: 39 Avg: 32 Max: 513