I understood nice to be an adjective, but I was questioning the word "low"; I see now you were referring to non-audio, so I understand.
I have two jackd scripts I use, one for Playback-only, and one for duplex using my Zoom H4 mic. I have attached the scripts and their outputs from your script. See anything I could improve?
Thanks.
-Chuckk
On 10/4/07, Florian Schmidt <mista.tapas@xxxxxxx> wrote:
On Thursday 04 October 2007, Chuckk Hubbard wrote:
> > Well, with a vanilla kernel you simply don't get the fine grained control
> > over
> > what code gets the cpu at what times as with a realtime-preemption
> > kernel..
> >
> > It is true that for many people a vanilla kernel with CONFIG_PREEMPT and
> > CONFIG_HZ=1000 delivers great performance, probably even better than
> > a "lowlatency" 2.4.x kernel. But basically one badly behaving kernel
> > driver
> > might cause delay, so for differing people the results differ. With a -rt
> > kernel you would just give this device a nice and low prio, so it doesn't
> > even get a chance to disturb the soundcard/jack..
>
> I'm a big fan of my rt-patched kernel; I'm also a big fan of taking out
> most of the distro's default stuff from the kernel. One of these days I
> will compile an rt kernel with no network support even - my soundcard
> shares an IRQ with eth1, I don't know if this will help or not.
> But isn't it a nice and high prio? As in, the chrt prio? I understood
> this as different from the nice prio, no? I may not be doing it correctly.
> I set my soundcard IRQ to something like 70, jackd to something like 65,
> and Pd to something like 60. The Pd GUI I set a little lower yet. Do I
> also have to renice these apps?
Well forget the word "nice" in that sentence. It has nothing to do with nice
levels :) Nice levels are only relevant for SCHED_OTHER processes. Anyways,
if your e.g. hd controller device disturbs your audio device make sure you
give the audio device a high prio and the controller device a low prio. That
was what i meant..
And yes, i consider it a bug that top and other software report the SCHED_FIFO
prio as negative values. Where does that come from? Does the prio already get
listed as negative in /proc? Or do they simply do it to separate the
SCHED_FIFO threads from SCHED_OTHER threads? Anyways POSIX speaks of positive
SCHED_FIFO prios in the range 1..99 afaik..
> I get visible xruns but not audible so far. I am guessing I have the wrong
> buffer sizes between Pd, Csound, and jackd...
No, i don't think so. If you use Pd and CSound as jack apps, then jack tells
them what buffer size to use. If one of these used the wrong size you would
definitely hear it..
Start jack and run this script and tell us the output please:
http://tapas.affenbande.org/rt-setup-report.sh
Thanks,
Flo
--
Palimm Palimm!
http://tapas.affenbande.org
--
http://www.badmuthahubbard.com
Attachment:
jackd.sh
Description: Bourne shell script
Attachment:
jackdup.sh
Description: Bourne shell script
chuckk@unclejesse:~$ ./rt-setup*
Hostname:
unclejesse
Kernel release info:
Linux unclejesse 2.6.22.1-acpi-cam #1 PREEMPT Wed Oct 3 22:49:48 EEST 2007 x86_64 GNU/Linux
PCI devices:
00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 10)
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 64
00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge (prog-if 00 [Normal decode])
Flags: bus master, 66MHz, medium devsel, latency 64
Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
I/O behind bridge: 00009000-00009fff
Memory behind bridge: c0100000-c01fffff
Prefetchable memory behind bridge: 00000000c8000000-00000000cfffffff
Capabilities: <access denied>
00:04.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=04, sec-latency=0
I/O behind bridge: 0000a000-0000afff
Memory behind bridge: c0200000-c02fffff
Capabilities: <access denied>
00:05.0 PCI bridge: ATI Technologies Inc Unknown device 5a37 (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=05, subordinate=07, sec-latency=0
Memory behind bridge: c0300000-c03fffff
Capabilities: <access denied>
00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80) (prog-if 10 [OHCI])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 19
Memory at c0004000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80) (prog-if 10 [OHCI])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 19
Memory at c0005000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller (rev 80) (prog-if 20 [EHCI])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 19
Memory at c0006000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 83)
Subsystem: Gateway 2000 Unknown device 0367
Flags: 66MHz, medium devsel
I/O ports at 8400 [size=16]
Memory at fed00000 (32-bit, non-prefetchable) [size=1K]
Capabilities: <access denied>
00:14.1 IDE interface: ATI Technologies Inc Standard Dual Channel PCI IDE Controller ATI (rev 80) (prog-if 82 [Master PriP])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 16
I/O ports at 01f0 [size=8]
I/O ports at 03f4 [size=1]
I/O ports at 0170 [size=8]
I/O ports at 0374 [size=1]
I/O ports at 8410 [size=16]
Capabilities: <access denied>
00:14.2 Audio device: ATI Technologies Inc SB450 HDA Audio (rev 01)
Subsystem: ATI Technologies Inc SB450 HDA Audio
Flags: bus master, slow devsel, latency 64, IRQ 16
Memory at c0000000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80)
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 0
00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge (rev 80) (prog-if 01 [Subtractive decode])
Flags: bus master, 66MHz, medium devsel, latency 64
Bus: primary=00, secondary=08, subordinate=0b, sec-latency=64
I/O behind bridge: 00002000-00002fff
Memory behind bridge: c0400000-c04fffff
Prefetchable memory behind bridge: 50000000-53ffffff
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
Flags: fast devsel
Capabilities: <access denied>
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
Flags: fast devsel
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
Flags: fast devsel
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
Flags: fast devsel
Capabilities: <access denied>
01:05.0 VGA compatible controller: ATI Technologies Inc RS482 [Radeon Xpress 200M] (prog-if 00 [VGA])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 66, IRQ 10
Memory at c8000000 (32-bit, prefetchable) [size=128M]
I/O ports at 9000 [size=256]
Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at c0120000 [disabled] [size=128K]
Capabilities: <access denied>
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8038 PCI-E Fast Ethernet Controller (rev 14)
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at c0200000 (64-bit, non-prefetchable) [size=16K]
I/O ports at a000 [size=256]
Capabilities: <access denied>
05:00.0 Network controller: Broadcom Corporation Dell Wireless 1390 WLAN Mini-PCI Card (rev 01)
Subsystem: Broadcom Corporation Unknown device 0465
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at c0300000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
08:09.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, medium devsel, latency 168, IRQ 20
Memory at c0404000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=08, secondary=09, subordinate=0a, sec-latency=176
Memory window 0: 50000000-53fff000 (prefetchable)
Memory window 1: 54000000-57fff000
I/O window 0: 00002000-000020ff
I/O window 1: 00002400-000024ff
16-bit legacy interface ports at 0001
08:09.1 FireWire (IEEE 1394): Texas Instruments PCIxx12 OHCI Compliant IEEE 1394 Host Controller (prog-if 10 [OHCI])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, medium devsel, latency 64, IRQ 11
Memory at c0405000 (32-bit, non-prefetchable) [size=2K]
Memory at c0400000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
08:09.2 Mass storage controller: Texas Instruments 5-in-1 Multimedia Card Reader (SD/MMC/MS/MS PRO/xD)
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, medium devsel, latency 64, IRQ 20
Memory at c0406000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Interrupts:
CPU0
0: 7451384 IO-APIC-edge timer
1: 16910 IO-APIC-edge i8042
8: 0 IO-APIC-edge rtc
12: 91809 IO-APIC-edge i8042
14: 55194 IO-APIC-edge ide0
16: 17785 IO-APIC-fasteoi eth1, HDA Intel
17: 124946 IO-APIC-fasteoi bcm43xx
19: 41988 IO-APIC-fasteoi ohci_hcd:usb1, ohci_hcd:usb2, ehci_hcd:usb3
20: 1 IO-APIC-fasteoi yenta, tifm_7xx1
21: 3228 IO-APIC-fasteoi acpi
NMI: 0
LOC: 7451277
ERR: 0
Irq handler priorities:
3 root 34 19 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd/0
Jackd priorities:
4114 chuckk -81 0 38116 21m 3796 S 0.0 2.4 0:00.00 jackd
4115 chuckk -71 0 38116 21m 3796 S 0.0 2.4 0:00.05 jackd
4113 chuckk 18 0 38116 21m 3796 S 0.0 2.4 0:00.00 jackd
4109 chuckk 19 0 38116 21m 3796 S 0.0 2.4 0:00.01 jackd
4112 chuckk 19 0 38116 21m 3796 S 0.0 2.4 0:00.00 jackd
Sound cards:
0 [SB ]: HDA-Intel - HDA ATI SB
HDA ATI SB at 0xc0000000 irq 16
1 [VirMIDI ]: VirMIDI - VirMIDI
Virtual MIDI Card 1
Sound devices:
0: [ 0] : control
1: : sequencer
16: [ 0- 0]: digital audio playback
22: [ 0- 6]: digital audio playback
24: [ 0- 0]: digital audio capture
30: [ 0- 6]: digital audio capture
32: [ 1] : control
33: : timer
40: [ 1- 0]: raw midi
41: [ 1- 1]: raw midi
42: [ 1- 2]: raw midi
43: [ 1- 3]: raw midi
chuckk@unclejesse:~$ ./rt-setup*
Hostname:
unclejesse
Kernel release info:
Linux unclejesse 2.6.22.1-acpi-cam #1 PREEMPT Wed Oct 3 22:49:48 EEST 2007 x86_64 GNU/Linux
PCI devices:
00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 10)
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 64
00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge (prog-if 00 [Normal decode])
Flags: bus master, 66MHz, medium devsel, latency 64
Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
I/O behind bridge: 00009000-00009fff
Memory behind bridge: c0100000-c01fffff
Prefetchable memory behind bridge: 00000000c8000000-00000000cfffffff
Capabilities: <access denied>
00:04.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=04, sec-latency=0
I/O behind bridge: 0000a000-0000afff
Memory behind bridge: c0200000-c02fffff
Capabilities: <access denied>
00:05.0 PCI bridge: ATI Technologies Inc Unknown device 5a37 (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=05, subordinate=07, sec-latency=0
Memory behind bridge: c0300000-c03fffff
Capabilities: <access denied>
00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80) (prog-if 10 [OHCI])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 19
Memory at c0004000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80) (prog-if 10 [OHCI])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 19
Memory at c0005000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller (rev 80) (prog-if 20 [EHCI])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 19
Memory at c0006000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 83)
Subsystem: Gateway 2000 Unknown device 0367
Flags: 66MHz, medium devsel
I/O ports at 8400 [size=16]
Memory at fed00000 (32-bit, non-prefetchable) [size=1K]
Capabilities: <access denied>
00:14.1 IDE interface: ATI Technologies Inc Standard Dual Channel PCI IDE Controller ATI (rev 80) (prog-if 82 [Master PriP])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 16
I/O ports at 01f0 [size=8]
I/O ports at 03f4 [size=1]
I/O ports at 0170 [size=8]
I/O ports at 0374 [size=1]
I/O ports at 8410 [size=16]
Capabilities: <access denied>
00:14.2 Audio device: ATI Technologies Inc SB450 HDA Audio (rev 01)
Subsystem: ATI Technologies Inc SB450 HDA Audio
Flags: bus master, slow devsel, latency 64, IRQ 16
Memory at c0000000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80)
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 0
00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge (rev 80) (prog-if 01 [Subtractive decode])
Flags: bus master, 66MHz, medium devsel, latency 64
Bus: primary=00, secondary=08, subordinate=0b, sec-latency=64
I/O behind bridge: 00002000-00002fff
Memory behind bridge: c0400000-c04fffff
Prefetchable memory behind bridge: 50000000-53ffffff
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
Flags: fast devsel
Capabilities: <access denied>
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
Flags: fast devsel
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
Flags: fast devsel
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
Flags: fast devsel
Capabilities: <access denied>
01:05.0 VGA compatible controller: ATI Technologies Inc RS482 [Radeon Xpress 200M] (prog-if 00 [VGA])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, 66MHz, medium devsel, latency 66, IRQ 10
Memory at c8000000 (32-bit, prefetchable) [size=128M]
I/O ports at 9000 [size=256]
Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at c0120000 [disabled] [size=128K]
Capabilities: <access denied>
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8038 PCI-E Fast Ethernet Controller (rev 14)
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at c0200000 (64-bit, non-prefetchable) [size=16K]
I/O ports at a000 [size=256]
Capabilities: <access denied>
05:00.0 Network controller: Broadcom Corporation Dell Wireless 1390 WLAN Mini-PCI Card (rev 01)
Subsystem: Broadcom Corporation Unknown device 0465
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at c0300000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
08:09.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, medium devsel, latency 168, IRQ 20
Memory at c0404000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=08, secondary=09, subordinate=0a, sec-latency=176
Memory window 0: 50000000-53fff000 (prefetchable)
Memory window 1: 54000000-57fff000
I/O window 0: 00002000-000020ff
I/O window 1: 00002400-000024ff
16-bit legacy interface ports at 0001
08:09.1 FireWire (IEEE 1394): Texas Instruments PCIxx12 OHCI Compliant IEEE 1394 Host Controller (prog-if 10 [OHCI])
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, medium devsel, latency 64, IRQ 11
Memory at c0405000 (32-bit, non-prefetchable) [size=2K]
Memory at c0400000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
08:09.2 Mass storage controller: Texas Instruments 5-in-1 Multimedia Card Reader (SD/MMC/MS/MS PRO/xD)
Subsystem: Gateway 2000 Unknown device 0367
Flags: bus master, medium devsel, latency 64, IRQ 20
Memory at c0406000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Interrupts:
CPU0
0: 7644552 IO-APIC-edge timer
1: 17700 IO-APIC-edge i8042
8: 0 IO-APIC-edge rtc
12: 92901 IO-APIC-edge i8042
14: 57175 IO-APIC-edge ide0
16: 50495 IO-APIC-fasteoi eth1, HDA Intel
17: 130474 IO-APIC-fasteoi bcm43xx
19: 57163 IO-APIC-fasteoi ohci_hcd:usb1, ohci_hcd:usb2, ehci_hcd:usb3
20: 1 IO-APIC-fasteoi yenta, tifm_7xx1
21: 3310 IO-APIC-fasteoi acpi
NMI: 0
LOC: 7644445
ERR: 0
Irq handler priorities:
3 root 34 19 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd/0
Jackd priorities:
4186 chuckk -81 0 37876 21m 3556 S 0.0 2.4 0:00.00 jackd
4187 chuckk -71 0 37876 21m 3556 S 4.0 2.4 0:00.06 jackd
4178 chuckk 17 0 10684 1524 1064 S 0.0 0.2 0:00.00 jackdup.sh
4184 chuckk 18 0 37876 21m 3556 S 0.0 2.4 0:00.00 jackd
4182 chuckk 21 0 37876 21m 3556 S 0.0 2.4 0:00.01 jackd
4183 chuckk 21 0 37876 21m 3556 S 0.0 2.4 0:00.00 jackd
Sound cards:
0 [SB ]: HDA-Intel - HDA ATI SB
HDA ATI SB at 0xc0000000 irq 16
1 [VirMIDI ]: VirMIDI - VirMIDI
Virtual MIDI Card 1
2 [H4 ]: USB-Audio - H4
ZOOM Corporation H4 at usb-0000:00:13.1-2, full speed
Sound devices:
0: [ 0] : control
1: : sequencer
16: [ 0- 0]: digital audio playback
22: [ 0- 6]: digital audio playback
24: [ 0- 0]: digital audio capture
30: [ 0- 6]: digital audio capture
32: [ 1] : control
33: : timer
40: [ 1- 0]: raw midi
41: [ 1- 1]: raw midi
42: [ 1- 2]: raw midi
43: [ 1- 3]: raw midi
64: [ 2] : control
80: [ 2- 0]: digital audio playback
88: [ 2- 0]: digital audio capture
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