Graeme Wilford wrote:
On 31/08/05, Tyler Trafford <[EMAIL PROTECTED]> wrote:
Lucas Meijer wrote:
Graeme Wilford wrote:
Use the ivtv_dynbuf=0 driver option as mentioned below.
Should we perhaps change the *default* to static buffer allocation?
This problem appears to crop up time and again...
Sounds like a good idea to me. I've not used the .3 series for months
and months because of freezups I didn't know how to get rid of, untill
recently a kind soul here suggested the ivtv_dynbuf=0 setting.
IIRC, the dynamic buffer alocation is preferable if you are loading the
newer firmware.
I thought it was frame rather than block DMA transfers that were
preferrable with newer firmware (from ivtv-driver.c):
/* If daring to use newer firmware, then change to frame based mode */
if (retval > 0x02040011) {
itv->dma_cfg.enc_buf_size = 0x8000; /* 32k */
itv->dma_cfg.fw_enc_dma_xfer = 1; /* frame based */
itv->dma_cfg.fw_enc_dma_type = 1;
} else if (itv->options.dynbuf) {
itv->dma_cfg.enc_buf_size = 0x8000;
}
Wouldn't have thought dynamic buffer allocation made any difference to
driver performance...
Chris?
The newer firmware only uses frame based DMA, it can't do byte based DMA
in same sized chunks per transfer. There's alot of different variables
there and they fit different situations, some find older firmware more
stable and some find newer firmware better performing and stable enough,
others find newer firmware unstable. So still something people could
test, the safe road is older firmware, that ensures things will be
mostly stable as they can for either decision.
Thanks,
Chris
Cheers,
WIlf.
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