Table of Contents
Latency Measurement Results
Read background info about these tests.
Headline
Legend:
HDA 1: Intel ICH6
HDA 2: ATI SB4x0
HDA 3: Intel 5 Series/3400 Series Chipset HDA (1458:a002)
USB 1: HY554
USB 2: Edirol UA-25 (Luis)
USB 3: Edirol UA-25 (Robin)
64*2/48kHz: jackd backend parameters -p64 -n2 -r48000
/S: jackdmp synchronous mode
RIL: reported input latency
ROL: reported output latency
Table 1: Total round-trip Latency
Table 1 - Latency values for six different audio devices: three on-board HDA and three external USB.
| HDA 1 | HDA 2 | HDA 3 | USB 1 | USB 2 | USB 3 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RIL | ROL | frames | ms | frames | ms | frames | ms | frames | ms | frames | ms | frames | ms | ||
| 64*2/48kHz/S | 64 | 64 | 160.42 | 3.34 | 156.37 | 3.26 | 169.9 | 3.54 | 312.63 | 6.51 | 378.48 | 7.88 | 377.75 | 7.87 | |
| 64*2/48kHz | 64 | 128 | 224.42 | 4.68 | 220.38 | 4.59 | 233.88 | 4.87 | 376.63 | 7.85 | 442.48 | 9.22 | 441.75 | 9.2 | |
| 64*3/48kHz/S | 64 | 128 | 223.42 | 4.65 | 220.38 | 4.59 | 232.85 | 4.85 | 376.63 | 7.85 | 442.47 | 9.22 | 441.75 | 9.2 | |
| 64*3/48kHz | 64 | 192 | 287.42 | 5.99 | 284.38 | 5.92 | 297.83 | 6.2 | 440.63 | 9.18 | 506.48 | 10.55 | 505.75 | 10.54 | |
| 128*2/48kHz/S | 128 | 128 | 287.42 | 5.99 | 284.37 | 5.92 | 296.81 | 6.18 | 488.63 | 10.18 | 554.5 | 11.55 | 553.75 | 11.54 | |
| 128*2/48kHz | 128 | 256 | 415.42 | 8.65 | 412.37 | 8.59 | 425.79 | 8.87 | 616.63 | 12.85 | 682.48 | 14.22 | 681.75 | 14.2 | |
| 128*3/48kHz/S | 128 | 256 | 416.42 | 8.68 | 412.37 | 8.59 | 424.76 | 8.85 | 616.63 | 12.85 | 682.47 | 14.22 | 680.75 | 14.18 | |
| 128*3/48kHz | 128 | 384 | 543.42 | 11.32 | 540.37 | 11.26 | 553.74 | 11.54 | 744.63 | 15.51 | 810.49 | 16.89 | 808.75 | 16.85 | |
| 256*2/48kHz/S | 256 | 256 | 543.42 | 11.32 | 540.38 | 11.26 | 552.72 | 11.51 | 888.63 | 18.51 | 954.49 | 19.89 | 952.75 | 19.85 | |
| 256*2/48kHz | 256 | 512 | 799.42 | 16.65 | 796.38 | 16.59 | 808.69 | 16.85 | 1144.62 | 23.85 | 1210.48 | 25.22 | 1208.75 | 25.18 | |
| 256*3/48kHz/S | 256 | 512 | 799.42 | 16.65 | 796.38 | 16.59 | 808.67 | 16.85 | 1144.62 | 23.85 | 1210.47 | 25.22 | 1208.75 | 25.18 | |
| 256*3/48kHz | 256 | 768 | 1055.42 | 21.99 | 1052.38 | 21.92 | 1064.65 | 22.18 | 1400.62 | 29.18 | 1466.49 | 30.55 | 1464.75 | 30.52 | |
| 512*2/48kHz/S | 512 | 512 | 1055.42 | 21.99 | 1052.38 | 21.92 | 1064.62 | 22.18 | 1640.62 | 34.18 | 1706.48 | 35.55 | 1704.75 | 35.52 | |
| 512*2/48kHz | 512 | 1024 | 1567.42 | 32.65 | 1564.38 | 32.59 | 1576.6 | 32.85 | 2152.62 | 44.85 | 2218.5 | 46.22 | 2216.75 | 46.18 | |
| 512*3/48kHz/S | 512 | 1024 | 1568.42 | 32.68 | 1564.38 | 32.59 | 1576.58 | 32.85 | 2152.62 | 44.85 | 2218.48 | 46.22 | 2216.75 | 46.18 | |
| 512*3/48kHz | 512 | 1536 | 2079.42 | 43.32 | 2076.38 | 43.26 | 2088.55 | 43.51 | 2664.62 | 55.51 | 2730.5 | 56.89 | 2728.75 | 56.85 | |
| 1024*2/48kHz/S | 1024 | 1024 | 2079.42 | 43.32 | 2075.38 | 43.24 | 2088.53 | 43.51 | 3192.62 | 66.51 | 3258.48 | 67.89 | 3257.75 | 67.87 | |
| 1024*2/48kHz | 1024 | 2048 | 3103.42 | 64.65 | 3099.38 | 64.57 | 3113.5 | 64.86 | 4216.62 | 87.85 | 4282.47 | 89.22 | 4281.75 | 89.2 | |
| 1024*3/48kHz/S | 1024 | 2048 | 3103.42 | 64.65 | 3100.38 | 64.59 | n.a. | n.a. | 4216.62 | 87.85 | 4282.5 | 89.22 | 4281.75 | 89.2 | |
| 1024*3/48kHz | 1024 | 3072 | 4127.42 | 85.99 | 4124.38 | 85.92 | n.a. | n.a. | 5240.62 | 109.18 | 5306.47 | 110.55 | 5257.75 | 109.54 | |
| 2048*2/48kHz/S | 2048 | 2048 | 4128.42 | 86.01 | 4124.38 | 85.92 | n.a. | n.a. | 5336.62 | 111.18 | 5354.49 | 111.55 | 5353.75 | 111.54 | |
| 2048*2/48kHz | 2048 | 4096 | 6176.42 | 128.68 | 6172.38 | 128.59 | n.a. | n.a. | 7384.62 | 153.85 | 7450.5 | 155.22 | 7401.75 | 154.2 | |
| 2048*3/48kHz/S | 2048 | 4096 | 6175.42 | 128.65 | 6172.38 | 128.59 | n.a. | n.a. | 7384.62 | 153.85 | 7450.48 | 155.22 | 7401.75 | 154.2 | |
| 2048*3/48kHz | 2048 | 6144 | 8224.42 | 171.34 | 8220.38 | 171.26 | n.a. | n.a. | 9432.62 | 196.51 | 9450.5 | 196.89 | 9401.75 | 195.87 | |
Table 2: Latency Overhead
Table 2 - Latency measurements minus jackd reported latency
| HDA 1 | HDA 2 | HDA 3 | USB 1 | USB 2 | USB 3 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| frames | ms | frames | ms | frames | ms | frames | ms | frames | ms | frames | ms | ||
| 64*2/48kHz/S | 32.42 | 0.68 | 28.37 | 0.59 | 41.9 | 0.87 | 184.63 | 3.85 | 250.48 | 5.22 | 249.75 | 5.2 | |
| 64*2/48kHz | 32.42 | 0.68 | 28.38 | 0.59 | 41.88 | 0.87 | 184.63 | 3.85 | 250.48 | 5.22 | 249.75 | 5.2 | |
| 64*3/48kHz/S | 31.42 | 0.65 | 28.38 | 0.59 | 40.85 | 0.85 | 184.63 | 3.85 | 250.47 | 5.22 | 249.75 | 5.2 | |
| 64*3/48kHz | 31.42 | 0.65 | 28.38 | 0.59 | 41.83 | 0.87 | 184.63 | 3.85 | 250.48 | 5.22 | 249.75 | 5.2 | |
| 128*2/48kHz/S | 31.42 | 0.65 | 28.37 | 0.59 | 40.81 | 0.85 | 232.63 | 4.85 | 298.5 | 6.22 | 297.75 | 6.2 | |
| 128*2/48kHz | 31.42 | 0.65 | 28.37 | 0.59 | 41.79 | 0.87 | 232.63 | 4.85 | 298.48 | 6.22 | 297.75 | 6.2 | |
| 128*3/48kHz/S | 32.42 | 0.68 | 28.37 | 0.59 | 40.76 | 0.85 | 232.63 | 4.85 | 298.47 | 6.22 | 296.75 | 6.18 | |
| 128*3/48kHz | 31.42 | 0.65 | 28.37 | 0.59 | 41.74 | 0.87 | 232.63 | 4.85 | 298.49 | 6.22 | 296.75 | 6.18 | |
| 256*2/48kHz/S | 31.42 | 0.65 | 28.38 | 0.59 | 40.72 | 0.85 | 376.63 | 7.85 | 442.49 | 9.22 | 440.75 | 9.18 | |
| 256*2/48kHz | 31.42 | 0.65 | 28.38 | 0.59 | 40.69 | 0.85 | 376.62 | 7.85 | 442.48 | 9.22 | 440.75 | 9.18 | |
| 256*3/48kHz/S | 31.42 | 0.65 | 28.38 | 0.59 | 40.67 | 0.85 | 376.62 | 7.85 | 442.47 | 9.22 | 440.75 | 9.18 | |
| 256*3/48kHz | 31.42 | 0.65 | 28.38 | 0.59 | 40.65 | 0.85 | 376.62 | 7.85 | 442.49 | 9.22 | 440.75 | 9.18 | |
| 512*2/48kHz/S | 31.42 | 0.65 | 28.38 | 0.59 | 40.62 | 0.85 | 616.62 | 12.85 | 682.48 | 14.22 | 680.75 | 14.18 | |
| 512*2/48kHz | 31.42 | 0.65 | 28.38 | 0.59 | 40.6 | 0.85 | 616.62 | 12.85 | 682.5 | 14.22 | 680.75 | 14.18 | |
| 512*3/48kHz/S | 32.42 | 0.68 | 28.38 | 0.59 | 40.58 | 0.85 | 616.62 | 12.85 | 682.48 | 14.22 | 680.75 | 14.18 | |
| 512*3/48kHz | 31.42 | 0.65 | 28.38 | 0.59 | 40.55 | 0.84 | 616.62 | 12.85 | 682.5 | 14.22 | 680.75 | 14.18 | |
| 1024*2/48kHz/S | 31.42 | 0.65 | 27.38 | 0.57 | 40.53 | 0.84 | 1144.62 | 23.85 | 1210.48 | 25.22 | 1209.75 | 25.2 | |
| 1024*2/48kHz | 31.42 | 0.65 | 27.38 | 0.57 | 41.5 | 0.86 | 1144.62 | 23.85 | 1210.47 | 25.22 | 1209.75 | 25.2 | |
| 1024*3/48kHz/S | 31.42 | 0.65 | 28.38 | 0.59 | 1144.62 | 23.85 | 1210.5 | 25.22 | 1209.75 | 25.2 | |||
| 1024*3/48kHz | 31.42 | 0.65 | 28.38 | 0.59 | 1144.62 | 23.85 | 1210.47 | 25.22 | 1161.75 | 24.2 | |||
| 2048*2/48kHz/S | 32.42 | 0.68 | 28.38 | 0.59 | 1240.62 | 25.85 | 1258.49 | 26.22 | 1257.75 | 26.2 | |||
| 2048*2/48kHz | 32.42 | 0.68 | 28.38 | 0.59 | 1240.62 | 25.85 | 1306.5 | 27.22 | 1257.75 | 26.2 | |||
| 2048*3/48kHz/S | 31.42 | 0.65 | 28.38 | 0.59 | 1240.62 | 25.85 | 1306.48 | 27.22 | 1257.75 | 26.2 | |||
| 2048*3/48kHz | 32.42 | 0.68 | 28.38 | 0.59 | 1240.62 | 25.85 | 1258.5 | 26.22 | 1209.75 | 25.2 | |||
Table 3
Table 3 - Latency measurements for USB devices minus jackd reported latency minus one extra period length
| USB 1 | USB 2 | USB 3 | |||||
|---|---|---|---|---|---|---|---|
| frames | ms | frames | ms | frames | ms | ||
| 64*2/48kHz/S | 120.63 | 2.51 | 186.48 | 3.89 | 185.75 | 3.87 | |
| 64*2/48kHz | 120.63 | 2.51 | 186.48 | 3.89 | 185.75 | 3.87 | |
| 64*3/48kHz/S | 120.63 | 2.51 | 186.47 | 3.88 | 185.75 | 3.87 | |
| 64*3/48kHz | 120.63 | 2.51 | 186.48 | 3.89 | 185.75 | 3.87 | |
| 128*2/48kHz/S | 104.63 | 2.18 | 170.5 | 3.55 | 169.75 | 3.54 | |
| 128*2/48kHz | 104.63 | 2.18 | 170.48 | 3.55 | 169.75 | 3.54 | |
| 128*3/48kHz/S | 104.63 | 2.18 | 170.47 | 3.55 | 168.75 | 3.52 | |
| 128*3/48kHz | 104.63 | 2.18 | 170.49 | 3.55 | 168.75 | 3.52 | |
| 256*2/48kHz/S | 120.63 | 2.51 | 186.49 | 3.89 | 184.75 | 3.85 | |
| 256*2/48kHz | 120.62 | 2.51 | 186.48 | 3.89 | 184.75 | 3.85 | |
| 256*3/48kHz/S | 120.62 | 2.51 | 186.47 | 3.88 | 184.75 | 3.85 | |
| 256*3/48kHz | 120.62 | 2.51 | 186.49 | 3.89 | 184.75 | 3.85 | |
| 512*2/48kHz/S | 104.62 | 2.18 | 170.48 | 3.55 | 168.75 | 3.52 | |
| 512*2/48kHz | 104.62 | 2.18 | 170.5 | 3.55 | 168.75 | 3.52 | |
| 512*3/48kHz/S | 104.62 | 2.18 | 170.48 | 3.55 | 168.75 | 3.52 | |
| 512*3/48kHz | 104.62 | 2.18 | 170.5 | 3.55 | 168.75 | 3.52 | |
| 1024*2/48kHz/S | 120.62 | 2.51 | 186.48 | 3.89 | 185.75 | 3.87 | |
| 1024*2/48kHz | 120.62 | 2.51 | 186.47 | 3.88 | 185.75 | 3.87 | |
| 1024*3/48kHz/S | 120.62 | 2.51 | 186.5 | 3.89 | 185.75 | 3.87 | |
| 1024*3/48kHz | 120.62 | 2.51 | 186.47 | 3.88 | 137.75 | 2.87 | |
| 2048*2/48kHz/S | -807.38 | -16.82 | -789.51 | -16.45 | -790.25 | -16.46 | |
| 2048*2/48kHz | -807.38 | -16.82 | -741.5 | -15.45 | -790.25 | -16.46 | |
| 2048*3/48kHz/S | -807.38 | -16.82 | -741.52 | -15.45 | -790.25 | -16.46 | |
| 2048*3/48kHz | -807.38 | -16.82 | -789.5 | -16.45 | -838.25 | -17.46 | |
Plots
(click on the image for full original size)
Table 1
Same plot with logarithmic time-axis (n = (2^x) with 4⇐x⇐12 , x ∈ N):
Table 2
Plot of Table 2 with logarithmic time-axis:
Table 3
HDA 1 and USB 1 showing the knee at p=1024 for USB devices: 
Datafiles and scripts
The raw data files (CSV) including the gnuplot script to generate these plots is available for download: latencyplot.tgz
A script to acquire the data using jack_delay can the found at git://rg42.org/latentor or directly:
latentor.tgz.