Hi List,

I've been using ivtv since 0.4.2-or so on a PVR-250, and have always
been very happy with it. I recently upgraded my current system (Athlon64
on Asus A8N-SLI Deluxe (NForce4 SLI) with CentOS4-i386 (2.6.9-xx
kernels)) with an X2 CPU, and changed to the SMP kernel. Due to
non-ivtv-issues I was unable to use the default kernel, and upgraded to
2.6.17.6, and therefore to ivtv-0.7.0. After a little work, I managed to
figure out which modules now were in the kernel rather than ivtv, and
got things working.

...except for the DMA errors.

I've /never/ had them with the UP kernels (ie 2.6.9 something and ivtv
0.4.6), but with the SMP kernel I got them fairly quickly. I'm grabbing
about an hour of TV a day, and I'm getting errors every few days (often
grouped together

The symptom is as noted elsewhere;
ivtv0 warning: ENC: (0) DMA Error 0x0000000b
(followed by persistent mpeg artifacts and semi-garbled sound)

I've applied the PIO-patch
(from one of the messages in "http://ivtvdriver.org/trac/ticket/48";),
and am seeing the increase in CPU usage (~50% on my Athlon64 running at
1000MHz), and have so far (1 day) not seen any new errors. Except for
the increased CPU use, ivtv seems happy;

ivtv:  ==================== START INIT IVTV ====================
ivtv:  version 0.7.0 (tagged release) loading
ivtv:  Linux version: 2.6.17.6-2 SMP mod_unload K8 REGPARM 4KSTACKS gcc-3.4
ivtv:  In case of problems please include the debug info between
ivtv:  the START INIT IVTV and END INIT IVTV lines, along with
ivtv:  any module options, when mailing the ivtv-users mailinglist.
ivtv0: Autodetected Hauppauge WinTV PVR-250 card (cx23416 based)
ACPI: PCI Interrupt Link [APC2] enabled at IRQ 17
ACPI: PCI Interrupt 0000:05:07.0[A] -> Link [APC2] -> GSI 17 (level,
low) -> IRQ
  20
ivtv0: Unreasonably low latency timer, setting to 64 (was 32)
tveeprom 2-0050: Hauppauge model 32034, rev B148, serial# 6960470
tveeprom 2-0050: tuner model is LG TP18PSB11D (idx 48, type 29)
tveeprom 2-0050: TV standards PAL(B/G) (eeprom 0x04)
tveeprom 2-0050: audio processor is MSP3415 (idx 6)
tveeprom 2-0050: decoder processor is SAA7115 (idx 19)
tveeprom 2-0050: has no radio, has IR remote
tuner 2-0061: chip found @ 0xc2 (ivtv i2c driver #0)
saa7115 2-0021: saa7115 found @ 0x42 (ivtv i2c driver #0)
msp3400 2-0040: MSP3415G-B8 found @ 0x80 (ivtv i2c driver #0)
msp3400 2-0040: MSP3415G-B8 supports nicam and radio, mode is autodetect
and aut
oselect
ivtv0: loaded v4l-cx2341x-enc.fw firmware (262144 bytes)
ivtv0: Encoder revision: 0x02050032
ivtv0: Allocate DMA encoder MPEG stream: 128 x 32768 buffers (4096KB total)
ivtv0: Allocate DMA encoder YUV stream: 161 x 12960 buffers (2048KB total)
ivtv0: Allocate DMA encoder VBI stream: 80 x 26208 buffers (2048KB total)
ivtv0: Allocate DMA encoder PCM audio stream: 455 x 4608 buffers (2048KB
total)
tuner 2-0061: type set to 29 (LG PAL_BG (TPI8PSB11D))
ivtv0: Initialized Hauppauge WinTV PVR-250, card #0
ivtv:  ====================  END INIT IVTV  ====================


Still - is there any progress on finding the source of this error? I see
both Bugs #48 and #49 (http://ivtvdriver.org/trac/ticket/48 and
http://ivtvdriver.org/trac/ticket/49) referring to or something like it
this.

Again, this is with an NForce4 chipset, and the problem did not appear
before I enabled SMP mode and/or upgraded the kernel and ivtv. In my
view the SMP-upgrade is the most significant of these changes.

Yours,
-S

-- 
Simen Thoresen, Dolphin ICS
Systems Administration and Wulfkit Support


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