Daniel James wrote:
> For ALSA MIDI there is: http://github.com/koppi/alsa-midi-latency-test
64 Studio 3.0 β
$ git clone git://github.com/koppi/alsa-midi-latency-test.git
$ cd alsa-midi-latency-test
$ sudo apt-get update
$ sudo apt-get install debhelper autotools-dev automake libasound2-dev
debhelper is already the newest version.
autotools-dev is already the newest version.
automake is already the newest version.
libasound2-dev is already the newest version.
$ sh autogen.sh
$ ./configure
$ sudo checkinstall
Done. The new package has been installed and saved to
/usr/src/alsa-midi-latency-test/alsa-midi-latency_0.0.3-1git20100621_amd64.deb
$ sudo make clean
$ alsa-midi-latency-test -l
Port Client name Port name
14:0 Midi Through Midi Through Port-0
16:0 TerraTec EWX24/96 TerraTec EWX24/96 MIDI
20:0 USB Device 0x170b:0x11 USB Device 0x170b:0x11 MIDI 1
$ alsa-midi-latency-test -i20:0 -o20:0
> alsa-midi-latency-test 0.0.3
> clock resolution: 0.000000001 s
> sampling 10000 midi latency values - please wait ...
> press Ctrl+C to abort test
sample; latency_ms; latency_ms_worst
0; 1.80; 1.80
2; 1.99; 1.99
4; 3.14; 3.14
11; 3.41; 3.41
27; 5.16; 5.16
2845; 5.43; 5.43
3842; 5.62; 5.62
3853; 7.00; 7.00
9999; 1.96; 7.00
> done.
> latency distribution:
...
1.3 - 1.4 ms: 1 #
1.4 - 1.5 ms: 5 #
1.5 - 1.6 ms: 6 #
1.6 - 1.7 ms: 8 #
1.7 - 1.8 ms: 10 #
1.8 - 1.9 ms: 50 #
1.9 - 2.0 ms: 229 #
2.0 - 2.1 ms: 9570
##################################################
2.1 - 2.2 ms: 44 #
2.2 - 2.3 ms: 33 #
2.3 - 2.4 ms: 9 #
2.4 - 2.5 ms: 4 #
2.5 - 2.6 ms: 5 #
2.6 - 2.7 ms: 2 #
2.7 - 2.8 ms: 1 #
2.8 - 2.9 ms: 1 #
2.9 - 3.0 ms: 2 #
3.0 - 3.1 ms: 2 #
3.1 - 3.2 ms: 2 #
3.2 - 3.3 ms: 2 #
3.3 - 3.4 ms: 1 #
3.4 - 3.5 ms: 3 #
...
3.7 - 3.8 ms: 1 #
3.8 - 3.9 ms: 1 #
...
4.4 - 4.5 ms: 1 #
...
5.0 - 5.1 ms: 1 #
5.1 - 5.2 ms: 1 #
5.2 - 5.3 ms: 1 #
...
5.4 - 5.5 ms: 1 #
...
5.6 - 5.7 ms: 1 #
...
6.0 - 6.1 ms: 1 #
...
7.0 - 7.1 ms: 1 #
> FAIL
best latency was 1.29 ms
worst latency was 7.00 ms, which is too much. Please check:
- if your hardware uses shared IRQs - `watch -n 1
cat /proc/interrupts`
while running this test to see, which IRQs the OS is using for your
midi hardware,
- if you're running this test on a realtime OS - `uname -a` should
contain '-rt',
- your OS' scheduling priorities - `chrt -p [pidof process name|
IRQ-?]`.
Have a look at
http://www.linuxaudio.org/mailarchive/lat/
to find out, howto fix issues with high midi latencies.
$ uname -a
Linux 64studio 2.6.31.12-rt20 #1 SMP PREEMPT RT Sun Feb 7 13:55:55 CET
2010 x86_64 GNU/Linux
$ alsa-midi-latency-test -i20:0 -o20:0
> alsa-midi-latency-test 0.0.3
> clock resolution: 0.000000001 s
> sampling 10000 midi latency values - please wait ...
> press Ctrl+C to abort test
sample; latency_ms; latency_ms_worst
0; 2.12; 2.12
41; 2.29; 2.29
56; 3.21; 3.21
2252; 3.24; 3.24
2423; 3.35; 3.35
4748; 4.44; 4.44
6760; 5.10; 5.10
7872; 15.41; 15.41
9999; 1.99; 15.41
> done.
> latency distribution:
...
1.3 - 1.4 ms: 2 #
1.4 - 1.5 ms: 6 #
1.5 - 1.6 ms: 26 #
1.6 - 1.7 ms: 12 #
1.7 - 1.8 ms: 20 #
1.8 - 1.9 ms: 21 #
1.9 - 2.0 ms: 280 #
2.0 - 2.1 ms: 9508
##################################################
2.1 - 2.2 ms: 33 #
2.2 - 2.3 ms: 18 #
2.3 - 2.4 ms: 18 #
2.4 - 2.5 ms: 12 #
2.5 - 2.6 ms: 17 #
2.6 - 2.7 ms: 4 #
2.7 - 2.8 ms: 1 #
2.8 - 2.9 ms: 3 #
2.9 - 3.0 ms: 2 #
3.0 - 3.1 ms: 3 #
3.1 - 3.2 ms: 2 #
3.2 - 3.3 ms: 2 #
3.3 - 3.4 ms: 1 #
3.4 - 3.5 ms: 1 #
3.5 - 3.6 ms: 2 #
3.6 - 3.7 ms: 1 #
...
4.2 - 4.3 ms: 1 #
...
4.4 - 4.5 ms: 2 #
...
5.1 - 5.2 ms: 1 #
...
15.4 - 15.5 ms: 1 #
> FAIL
best latency was 1.30 ms
worst latency was 15.41 ms, which is too much. Please check:
- if your hardware uses shared IRQs - `watch -n 1
cat /proc/interrupts`
while running this test to see, which IRQs the OS is using for your
midi hardware,
- if you're running this test on a realtime OS - `uname -a` should
contain '-rt',
- your OS' scheduling priorities - `chrt -p [pidof process name|
IRQ-?]`.
Have a look at
http://www.linuxaudio.org/mailarchive/lat/
to find out, howto fix issues with high midi latencies.
64 Studio 3.3 α
$ su root -c "apt-get update"
$ su root -c "apt-get install git-core debhelper autotools-dev automake
libasound2-dev"
debhelper is already the newest version.
autotools-dev is already the newest version.
automake is already the newest version.
libasound2-dev is already the newest version.
The following NEW packages will be installed:
git-core libdigest-sha1-perl liberror-perl
$ git clone git://github.com/koppi/alsa-midi-latency-test.git
$ cd alsa-midi-latency-test
$ su root -c "apt-get install libtool"
The following NEW packages will be installed:
libltdl-dev libtool
$ sh autogen.sh
$ ./configure
$ su root -c checkinstall
Done. The new package has been installed and saved to
/usr/src/alsa-midi-latency-test/alsa-midi-latency_0.0.3-1git20100621~3.3a_amd64.deb
$ su root -c "make clean"
$ alsa-midi-latency-test -l
Port Client name Port name
14:0 Midi Through Midi Through Port-0
16:0 TerraTec EWX24/96 TerraTec EWX24/96 MIDI
20:0 USB Device 0x170b:0x11 USB Device 0x170b:0x11 MIDI 1
$ alsa-midi-latency-test -i20:0 -o20:0
> alsa-midi-latency-test 0.0.3
> clock resolution: 0.000000001 s
> sampling 10000 midi latency values - please wait ...
> press Ctrl+C to abort test
sample; latency_ms; latency_ms_worst
0; 1.80; 1.80
2; 1.99; 1.99
4; 1.99; 1.99
6; 2.01; 2.01
12; 2.07; 2.07
62; 7.16; 7.16
65; 9.33; 9.33
5668; 10.43; 10.43
9999; 1.99; 10.43
> done.
> latency distribution:
...
1.3 - 1.4 ms: 2 #
1.4 - 1.5 ms: 4 #
1.5 - 1.6 ms: 11 #
1.6 - 1.7 ms: 8 #
1.7 - 1.8 ms: 32 #
1.8 - 1.9 ms: 84 #
1.9 - 2.0 ms: 848 #####
2.0 - 2.1 ms: 8810
##################################################
2.1 - 2.2 ms: 67 #
2.2 - 2.3 ms: 63 #
2.3 - 2.4 ms: 13 #
2.4 - 2.5 ms: 7 #
2.5 - 2.6 ms: 8 #
2.6 - 2.7 ms: 3 #
...
2.8 - 2.9 ms: 4 #
2.9 - 3.0 ms: 1 #
3.0 - 3.1 ms: 4 #
3.1 - 3.2 ms: 10 #
3.2 - 3.3 ms: 5 #
3.3 - 3.4 ms: 2 #
...
3.6 - 3.7 ms: 1 #
...
3.9 - 4.0 ms: 1 #
4.0 - 4.1 ms: 1 #
4.1 - 4.2 ms: 1 #
4.2 - 4.3 ms: 1 #
4.3 - 4.4 ms: 1 #
...
4.5 - 4.6 ms: 1 #
...
5.0 - 5.1 ms: 1 #
5.1 - 5.2 ms: 2 #
...
7.2 - 7.3 ms: 1 #
...
9.1 - 9.2 ms: 1 #
...
9.3 - 9.4 ms: 1 #
...
10.4 - 10.5 ms: 1 #
> FAIL
best latency was 1.25 ms
worst latency was 10.43 ms, which is too much. Please check:
- if your hardware uses shared IRQs - `watch -n 1
cat /proc/interrupts`
while running this test to see, which IRQs the OS is using for your
midi hardware,
- if you're running this test on a realtime OS - `uname -a` should
contain '-rt',
- your OS' scheduling priorities - `chrt -p [pidof process name|
IRQ-?]`.
Have a look at
http://www.linuxaudio.org/mailarchive/lat/
to find out, howto fix issues with high midi latencies.
$ alsa-midi-latency-test -i20:0 -o20:0
> alsa-midi-latency-test 0.0.3
> clock resolution: 0.000000001 s
> sampling 10000 midi latency values - please wait ...
> press Ctrl+C to abort test
sample; latency_ms; latency_ms_worst
0; 1.68; 1.68
1; 1.85; 1.85
2; 1.97; 1.97
3; 1.98; 1.98
5; 1.99; 1.99
11; 2.00; 2.00
12; 6.49; 6.49
652; 7.61; 7.61
9999; 1.96; 7.61
> done.
> latency distribution:
...
1.3 - 1.4 ms: 6 #
1.4 - 1.5 ms: 2 #
1.5 - 1.6 ms: 9 #
1.6 - 1.7 ms: 4 #
1.7 - 1.8 ms: 11 #
1.8 - 1.9 ms: 72 #
1.9 - 2.0 ms: 892 #####
2.0 - 2.1 ms: 8813
##################################################
2.1 - 2.2 ms: 113 #
2.2 - 2.3 ms: 31 #
2.3 - 2.4 ms: 7 #
2.4 - 2.5 ms: 3 #
2.5 - 2.6 ms: 5 #
2.6 - 2.7 ms: 4 #
2.7 - 2.8 ms: 4 #
2.8 - 2.9 ms: 1 #
2.9 - 3.0 ms: 1 #
3.0 - 3.1 ms: 2 #
3.1 - 3.2 ms: 4 #
3.2 - 3.3 ms: 2 #
...
3.4 - 3.5 ms: 3 #
...
3.6 - 3.7 ms: 1 #
...
3.8 - 3.9 ms: 2 #
...
4.3 - 4.4 ms: 1 #
...
5.0 - 5.1 ms: 1 #
5.1 - 5.2 ms: 1 #
...
5.6 - 5.7 ms: 1 #
...
6.0 - 6.1 ms: 1 #
...
6.2 - 6.3 ms: 1 #
...
6.5 - 6.6 ms: 1 #
...
7.6 - 7.7 ms: 1 #
> FAIL
best latency was 1.28 ms
worst latency was 7.61 ms, which is too much. Please check:
- if your hardware uses shared IRQs - `watch -n 1
cat /proc/interrupts`
while running this test to see, which IRQs the OS is using for your
midi hardware,
- if you're running this test on a realtime OS - `uname -a` should
contain '-rt',
- your OS' scheduling priorities - `chrt -p [pidof process name|
IRQ-?]`.
Have a look at
http://www.linuxaudio.org/mailarchive/lat/
to find out, howto fix issues with high midi latencies.
$ uname -a
Linux 64studio 2.6.31-2-multimedia-amd64 #1 SMP PREEMPT RT Thu Oct 1
16:14:20 BST 2009 x86_64 GNU/Linux
$ watch -n 1 cat /proc/interrupts
Every 1.0s: cat /proc/interrupts
Mon Jun 21 16:19:33 2010
CPU0 CPU1
0: 123 11 IO-APIC-edge timer
1: 8 3191 IO-APIC-edge i8042
4: 0 2 IO-APIC-edge
7: 0 0 IO-APIC-edge parport0
8: 0 1 IO-APIC-edge rtc0
9: 0 0 IO-APIC-fasteoi acpi
12: 1024 405706 IO-APIC-edge i8042
14: 68 26273 IO-APIC-edge ide0
16: 0 1 IO-APIC-fasteoi ohci_hcd:usb1
17: 131 39969 IO-APIC-fasteoi ohci_hcd:usb3,
ohci_hcd:usb5
18: 398 298098 IO-APIC-fasteoi ohci_hcd:usb4,
ohci_hcd:usb6, nvidia
19: 0 2 IO-APIC-fasteoi ehci_hcd:usb2
21: 0 0 IO-APIC-fasteoi ICE1712
22: 97 35525 IO-APIC-fasteoi ohci1394, ahci
26: 36 13608 PCI-MSI-edge eth0
NMI: 0 0 Non-maskable interrupts
LOC: 647594 532821 Local timer interrupts
SPU: 0 0 Spurious interrupts
CNT: 0 0 Performance counter interrupts
PND: 0 0 Performance pending work
RES: 678727 69574 Rescheduling interrupts
CAL: 1102 62 Function call interrupts
TLB: 1383 1591 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 11 11 Machine check polls
ERR: 0
MIS: 0
$ lsusb
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 170b:0011 Swissonic MIDI-USB 1x1
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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