[Should this and my previous message have gone to ivtv-devel instead?]
[ivtv 0.4.0, myth 0.18.1, 5xPVR-250's and ivtv 0.4.1, myth 0.18.1, 1xPVR-350.]
When ivtv data isn't being read fast enough because of a short-term
spike in disk I/O due to a big MySQL query (see my previous message
today), I get a ton of these messages emitted in my syslog:
Jan 17 21:00:19 myth-master-backend kernel: [4303533.766000] ivtv4 warning:
ENC Stream 0 OVERFLOW #0: Stealing a Buffer, 512 currently allocated
But if I increase the buffering---currently I'm running with this
options ivtv yuv_buffers=16 mpg_buffers=8 vbi_buffers=8 pcm_buffers=8
dec_osd_buffers=2
and verified as having done -something- after a reboot because my syslog went
from
Jan 17 18:15:36 myth-master-backend kernel: [4294696.898000] ivtv4:
Allocate DMA encoder MPEG stream: 128 x 32768 buffers (4096KB total)
Jan 17 18:15:36 myth-master-backend kernel: [4294696.899000] ivtv4:
Allocate DMA encoder YUV stream: 194 x 10800 buffers (2048KB total)
Jan 17 18:15:36 myth-master-backend kernel: [4294696.900000] ivtv4:
Allocate DMA encoder VBI stream: 120 x 17472 buffers (2048KB total)
Jan 17 18:15:36 myth-master-backend kernel: [4294696.901000] ivtv4:
Allocate DMA encoder PCM audio stream: 455 x 4608 buffers (2048KB total)
to
Jan 18 17:49:39 myth-master-backend kernel: [4294698.245000] ivtv4:
Allocate DMA encoder MPEG stream: 256 x 32768 buffers (8192KB total)
Jan 18 17:49:39 myth-master-backend kernel: [4294698.246000] ivtv4:
Allocate DMA encoder YUV stream: 1553 x 10800 buffers (16384KB total)
Jan 18 17:49:39 myth-master-backend kernel: [4294698.249000] ivtv4:
Allocate DMA encoder VBI stream: 480 x 17472 buffers (8192KB total)
Jan 18 17:49:39 myth-master-backend kernel: [4294698.250000] ivtv4:
Allocate DMA encoder PCM audio stream: 1820 x 4608 buffers (8192KB total)
---then I have two issues:
(a) the problem hasn't gotten any better, and
(b) the "ENC Stream 0 OVERFLOW" messages still claim there are only 512
buffers, e.g.,
Jan 18 21:33:21 myth-master-backend kernel: [4308167.435000] ivtv4 warning:
ENC Stream 0 OVERFLOW #58: Stealing a Buffer, 512 currently allocated
Shouldn't the number of allocated buffers -change- between these two
cases, or is that "512" not reflecting what I think it's reflecting?
(I certainly have less available RAM after booting with more buffers
than I did before, but I'm beginning to wonder if those buffers aren't
getting -used- for anything...)
I may try again w/o the yuv buffers and with everything else maxed out
(I'd like to know if that's a reasonable thing to attempt), but it'd
be nice to know if the extra RAM is -actually- going to buffering...
Note that this is in a system with 5 PVR-250's in it, and that I'm
also running with "options msp3400 debug=1" in /etc/modprobe.d/ivtv
as well, FWIW. (I'm superstitious about removing that, since I put
it in when I first started using ivtv and Myth to track down an
intermittent problem with no audio on channel 2, and it went away
after that. I'm afraid removing it might cause some of my recordings
from that channel to have no audio again...)
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