Differences

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--- wiki:jack_latency_results [2010/12/05 22:46] – created rgareus
+++ wiki:jack_latency_results [2013/06/02 15:45] (current) – external edit 127.0.0.1
@@ Line 5: / Line 5: @@
 ===== Headline =====
-HDA 1: Intel ICH6\\
+Legend:
-HDA 2: ATI SB4x0\\
-HDA 3: Intel\\
+**HDA 1**: Intel ICH6\\
-USB 1: HY554\\
+**HDA 2**: ATI SB4x0\\
-USB 2: Edirol UA-25 (Luis)\\
+**HDA 3**: Intel 5 Series/3400 Series Chipset HDA (1458:a002)\\
-USB 3: Edirol UA-25 (Robin)\\
+**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\\
-**RIL**: reported input latency
-**RIL**: reported output latency
-**S**: jackdmp synchronous mode
 ==== Table 1: Total round-trip Latency ====
@@ Line 20: / Line 24: @@
 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||
+^ ^ ^ ^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||
+^ ^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|
@@ Line 52: / Line 56: @@
 Table 2 - Latency measurements minus jackd reported latency
-| |HDA 1||HDA 2 ||HDA 3||USB 1||USB 2||USB 3||
+^ ^HDA 1^^HDA 2^^HDA 3^^USB 1^^USB 2^^USB 3^^
-| |frames|ms|frames|ms|frames|ms|frames|ms|frames|ms|frames|ms||
+^ ^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|
@@ Line 82: / Line 86: @@
 Table 3 - Latency measurements for USB devices minus jackd reported latency minus one extra period length
-| | USB 1 || USB 2 || USB 3 ||
+^ ^ USB 1^^USB 2^^USB 3^^
-| |frames|ms|frames|ms|frames|ms||
+^ ^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|
@@ Line 107: / Line 111: @@
 |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 ====
+{{:wiki:jack_latency_tests:table1lin.png?810|
+Table 1 - Latency values for six different audio devices: three on-board HDA and three external USB.}}
+Same plot with logarithmic time-axis (n = (2^x) with  4<=x<=12 , x ∈ N):
+{{:wiki:jack_latency_tests:table1.png?250|Table 1 - Latency values for six different audio devices (log scale): three on-board HDA and three external USB.}}
+==== Table 2 ====
+{{:wiki:jack_latency_tests:table2lin.png?810|Table 2 - Latency measurements minus jackd reported latency}}
+Plot of Table 2 with logarithmic time-axis:
+{{:wiki:jack_latency_tests:table2.png?250|Table 2 - Latency measurements minus jackd reported latency (log scale)}}
+==== Table 3 ====
+{{:wiki:jack_latency_tests:table3.png?810|Table 3 - Latency measurements for USB devices minus jackd reported latency minus one extra period length}}
+HDA 1 and USB 1 showing the knee at p=1024 for USB devices: {{:wiki:jack_latency_tests:table3b.png?250|}}
+===== Datafiles and scripts =====
+The raw data files (CSV) including the gnuplot script to generate these plots is available for download:
+{{:wiki:jack_latency_tests:latencyplot.tgz|}}
+A script to acquire the data using ''jack_delay'' can the found at ''%%git://rg42.org/latentor%%'' or directly:
+[[http://rg42.org/gitweb/?p=latentor.git;a=snapshot;sf=tgz|latentor.tgz]].