Hi Todd,
There are three reasons for this error based on our current knowledge:
1) Cpu frequency changing, 2) graphics cards that use system memory (as
opposed to having there own memory) and 3) raid arrays.
In your case I'd say it is number 3.
I don't think there is much that can be done about it (except avoiding
raid setups) since the root cause is the crappy DMA engine of the
cx23415/6.
Hans
On Friday 20 October 2006 03:31, Todd Foggoa wrote:
> Hi Folks,
>
> I seem to be plagued with these DMA errors almost every time I try to
> record something now. These errors are happening on the latest ivtv
> driver 0.7.1
> The errors look like the following:
> ivtv0 warning: ENC: (0) DMA Error 0x0000000b 00020001
> ivtv0 warning: offset 8 -> 128
> ivtv0 warning: offset 128 -> 120
> ivtv0 warning: ENC: REG_DMAXFER 2 wait failed
> ivtv0 warning: ENC: (0) DMA Error 0x00000001 00000001
>
> My Setup is:
> Linux dawg 2.6.17-gentoo-r8 #4 PREEMPT Tue Oct 3 06:48:59 EDT 2006
> x86_64 AMD Athlon(tm) 64 Processor 3000+ GNU/Linux
> I am running on an ASUS AV8 Deluxe motherboard with 4 ide hard drives
> setup in raid5 with LVM configured on the raid array. I have an extra
> IDE controller card and 2 hauppage 250 cards and am using MythTV.
>
> I've read alot about people thinking these are due to cpu frequency
> changes or opengl related. However, I don't believe it is due to
> either of these. I can easily reproduce these DMA errors without
> MythTV and without cpu frequency scaling. To reproduce I cat both
> tuners to files on my lvm/raid5 array and then have another computer
> cat some large files to /dev/null via NFS.
>
> I'm thinking this must have something to due the amount of interrupts
> happening as in my test case above has interrupts going off for the
> network card, the HD access (for all 4 drives) and the two tuner
> cards. Do we know if the ivtv driver is spending a lot of time at
> interrupt level? Anyone have any comments about this?
>
> I've setup a page on the ivtvdriver.org wiki for this so hopefully we
> can get some more information to narrow down this problem. I've also
> updated it with information from others posts:
> http://ivtvdriver.org/index.php/DMA
>
> If there is any testing /debugging I can do on my setup I'm more than
> happy to help out.
>
> And my ivtv dmesg output is below.
>
> Thanks,
> -Todd
>
> ivtv: ==================== START INIT IVTV ====================
> ivtv: version 0.7.1 (tagged release) loading
> ivtv: Linux version: 2.6.17-gentoo-r8 preempt mod_unload 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 (cx23415 based)
> tuner 0-0061: chip found @ 0xc2 (ivtv i2c driver #0)
> saa7115 0-0021: saa7115 found @ 0x42 (ivtv i2c driver #0)
> msp3400 0-0040: MSP4448G-A2 found @ 0x80 (ivtv i2c driver #0)
> ivtv0: loaded v4l-cx2341x-enc.fw firmware (262144 bytes)
> ivtv0: loaded v4l-cx2341x-dec.fw firmware (262144 bytes)
> ivtv0: Encoder revision: 0x02050032
> ivtv0: Decoder revision: 0x02020023
> ivtv0: Allocate DMA encoder MPEG stream: 128 x 32768 buffers (4096KB
> total) ivtv0: Allocate DMA encoder YUV stream: 194 x 10800 buffers
> (2048KB total) ivtv0: Allocate DMA encoder VBI stream: 120 x 17472
> buffers (2048KB total) ivtv0: Allocate DMA encoder PCM audio stream:
> 455 x 4608 buffers (2048KB total) ivtv0: Initialized Hauppauge WinTV
> PVR-250, card #0
> ivtv: ====================== NEXT CARD ======================
> ivtv1: Autodetected Hauppauge WinTV PVR-250 card (cx23416 based)
> tuner 1-0061: chip found @ 0xc2 (ivtv i2c driver #1)
> saa7115 1-0021: saa7115 found @ 0x42 (ivtv i2c driver #1)
> msp3400 1-0040: MSP4448G-A2 found @ 0x80 (ivtv i2c driver #1)
> ivtv1: loaded v4l-cx2341x-enc.fw firmware (262144 bytes)
> ivtv1: Encoder revision: 0x02050032
> ivtv1: Allocate DMA encoder MPEG stream: 128 x 32768 buffers (4096KB
> total) ivtv1: Allocate DMA encoder YUV stream: 194 x 10800 buffers
> (2048KB total) ivtv1: Allocate DMA encoder VBI stream: 120 x 17472
> buffers (2048KB total) ivtv1: Allocate DMA encoder PCM audio stream:
> 455 x 4608 buffers (2048KB total) ivtv1: Create encoder radio stream
> ivtv1: Initialized Hauppauge WinTV PVR-250, card #1
> ivtv: ==================== END INIT IVTV ====================
>
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