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Hi Rui,
sorry for the week delay. I finally got the info you requested from Karl.

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This is code from rtirq where we added ohci1394 to it.

# IRQ thread service names
# (space separated list, from higher to lower priority).
RTIRQ_NAME_LIST="rtc snd usb i8042 ohci1394"

This is the output of jack_lsp. I'm running jack with 64ms latency, 1024, with 3 buffers. Not getting any xruns. Vocals on inputs 1-5 are not in sync.

[karl@client2 ~]$ jack_lsp -plL
system:AC0_dev0_Unknown
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC1_dev0_Unknown0
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC2_dev0_Unknown1
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC3_dev0_Unknown2
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC4_dev0_Unknown3
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC5_dev0_Unknown4
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC6_dev0_Unknown5
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC7_dev0_Unknown6
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC8_dev0_Unknown7
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC9_dev0_Unknown8
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC10_dev0_Unknown9
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC11_dev0_Unknown10
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:MC12_dev0_Unknown11
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC13_dev1_Unknown
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC14_dev1_Unknown0
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC15_dev1_Unknown1
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC16_dev1_Unknown2
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC17_dev1_Unknown3
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC18_dev1_Unknown4
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC19_dev1_Unknown5
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC20_dev1_Unknown6
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC21_dev1_Unknown7
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC22_dev1_Unknown8
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC23_dev1_Unknown9
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AC24_dev1_Unknown10
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:MC25_dev1_Unknown11
port latency = 1024 frames
total latency = 1024 frames
properties: output,physical,terminal,
system:AP0_dev0_Unknown
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP1_dev0_Unknown0
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP2_dev0_Unknown1
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP3_dev0_Unknown2
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP4_dev0_Unknown3
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP5_dev0_Unknown4
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP6_dev0_Unknown5
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP7_dev0_Unknown6
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP8_dev0_Unknown7
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP9_dev0_Unknown8
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP10_dev0_Unknown9
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP11_dev0_Unknown10
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:MP12_dev0_Unknown11
port latency = 2048 frames
total latency = 2048 frames
properties: input,physical,terminal,
system:AP13_dev1_Unknown
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP14_dev1_Unknown0
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP15_dev1_Unknown1
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP16_dev1_Unknown2
port latency = 3072 frames
total latency = 6144 frames
properties: input,physical,terminal,
system:AP17_dev1_Unknown3
port latency = 3072 frames
total latency = 3072 frames
properties: input,physical,terminal,
system:AP18_dev1_Unknown4
port latency = 3072 frames
total latency = 3072 frames
properties: input,physical,terminal,
system:AP19_dev1_Unknown5
port latency = 3072 frames
total latency = 3072 frames
properties: input,physical,terminal,
system:AP20_dev1_Unknown6
port latency = 3072 frames
total latency = 3072 frames
properties: input,physical,terminal,
system:AP21_dev1_Unknown7
port latency = 3072 frames
total latency = 3072 frames
properties: input,physical,terminal,
system:AP22_dev1_Unknown8
port latency = 3072 frames
total latency = 3072 frames
properties: input,physical,terminal,
system:AP23_dev1_Unknown9
port latency = 3072 frames
total latency = 3072 frames
properties: input,physical,terminal,
system:AP24_dev1_Unknown10
port latency = 3072 frames
total latency = 3072 frames
properties: input,physical,terminal,
system:MP25_dev1_Unknown11
port latency = 2048 frames
total latency = 2048 frames
properties: input,physical,terminal,
Qtractor:Master/in_1
port latency = 0 frames
total latency = 3072 frames
properties: input,
Qtractor:Master/in_2
port latency = 0 frames
total latency = 3072 frames
properties: input,
Qtractor:Master/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Master/out_2
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 1/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 1/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 2/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 2/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 3/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 3/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 4/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 4/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 5/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 5/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 6/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 6/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 7/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 7/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 8/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 8/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 9/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 9/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 10/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 10/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 11/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 11/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 12/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 12/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 13/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 13/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 14/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 14/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 15/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 15/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Bus 16/in_1
port latency = 0 frames
total latency = 1024 frames
properties: input,
Qtractor:Bus 16/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
Qtractor:Monitor 1/in_1
port latency = 0 frames
total latency = 3072 frames
properties: input,
Qtractor:Monitor 1/out_1
port latency = 0 frames
total latency = 3072 frames
properties: output,
[karl@client2 ~]$