[PlanetCCRMA] [Low latency patches] Voluntary Preempt vs.Staircase+mappedwatermark

Arthur Sosa arthur.sosa@email.it
Thu Sep 2 15:45:01 2004


On Thu, 02 Sep 2004 15:01:10 -0700
Mark Knecht <markknecht@comcast.net> wrote:

> I wanted to clarify - are you running
>  as a user or as root?

As root, so I can achieve best results
# jackd -Rv -d alsa -p 128 -n 3 -r 44100

If I don't want xruns to apper as a normal user,
I must use these settings 
$ jackd -v -d alsa -p 1024 -n 3 -r 44100

ehm.. I didn't install realtime-lsm.. I will do.

Notice that I got those good results even if I didn't
set correctly PCI latencies as I did during past days
(thanks to Fernando). Perhaps a good oversight..
[sure except for host bridge and net-card, I have
 scripts messed-up]:


# lspci -v
00:00.0 Host bridge: VIA Technologies, Inc. VT8377 [KT400/KT600 AGP] Host Bridge
        Subsystem: Giga-byte Technology GA-7VAX Mainboard
        Flags: bus master, 66Mhz, medium devsel, latency 8
        Memory at d0000000 (32-bit, prefetchable)
        Capabilities: [a0] AGP version 2.0
        Capabilities: [c0] Power Management version 2

00:01.0 PCI bridge: VIA Technologies, Inc. VT8235 PCI Bridge (prog-if 00 [Normal decode])
        Flags: bus master, 66Mhz, medium devsel, latency 0
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
        Memory behind bridge: e8000000-e9ffffff
        Prefetchable memory behind bridge: d8000000-e7ffffff
        Capabilities: [80] Power Management version 2

00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) (prog-if 00 [UHCI])
        Subsystem: Giga-byte Technology GA-7VAX Mainboard
        Flags: bus master, medium devsel, latency 32, IRQ 10
        I/O ports at d000 [size=32]
        Capabilities: [80] Power Management version 2

00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) (prog-if 00 [UHCI])
        Subsystem: Giga-byte Technology GA-7VAX Mainboard
        Flags: bus master, medium devsel, latency 32, IRQ 10
        I/O ports at d400 [size=32]
        Capabilities: [80] Power Management version 2

00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) (prog-if 00 [UHCI])
        Subsystem: Giga-byte Technology GA-7VAX Mainboard
        Flags: bus master, medium devsel, latency 32, IRQ 11
        I/O ports at d800 [size=32]
        Capabilities: [80] Power Management version 2

00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82) (prog-if 20 [EHCI])
        Subsystem: Giga-byte Technology GA-7VAX Mainboard
        Flags: bus master, medium devsel, latency 32, IRQ 11
        Memory at ea000000 (32-bit, non-prefetchable)
        Capabilities: [80] Power Management version 2

00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
        Subsystem: Giga-byte Technology GA-7VAX Mainboard
        Flags: bus master, stepping, medium devsel, latency 0
        Capabilities: [c0] Power Management version 2

00:11.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) (prog-if 8a [Master SecP PriP])
        Subsystem: Giga-byte Technology GA-7VAX Mainboard
        Flags: bus master, medium devsel, latency 32
        I/O ports at dc00 [size=16]
        Capabilities: [c0] Power Management version 2

00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 50)
        Subsystem: Giga-byte Technology GA-7VAX Onboard Audio (Realtek ALC650)
        Flags: medium devsel, IRQ 11
        I/O ports at e000
        Capabilities: [c0] Power Management version 2

00:13.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
        Subsystem: Realtek Semiconductor Co., Ltd. RT8139
        Flags: bus master, medium devsel, latency 32, IRQ 11
        I/O ports at e400
        Memory at ea001000 (32-bit, non-prefetchable) [size=256]
        Capabilities: [50] Power Management version 2

00:14.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host Controller (rev 46) (prog-if 10 [OHCI])
        Subsystem: Giga-byte Technology: Unknown device 1000
        Flags: bus master, medium devsel, latency 32, IRQ 10
        Memory at ea002000 (32-bit, non-prefetchable)
        I/O ports at e800 [size=128]
        Capabilities: [50] Power Management version 2

01:00.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4 MX 440] (rev a3) (prog-if 00 [VGA])
        Subsystem: Micro-Star International Co., Ltd.: Unknown device 8773
        Flags: bus master, 66Mhz, medium devsel, latency 32, IRQ 10
        Memory at e8000000 (32-bit, non-prefetchable)
        Memory at d8000000 (32-bit, prefetchable) [size=128M]
        Memory at e0000000 (32-bit, prefetchable) [size=512K]
        Capabilities: [60] Power Management version 2
        Capabilities: [44] AGP version 2.0




Do you use latency=32 or do you think it is too low?


















 
 
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