>> From: Jeff Brower <jbrower@signalogic.com>
>>
>> Firas-
>> A couple of brief comments:
>> 1) Sounds like this was a
>> high-speed data acq card, optimized for streaming, not an accelerator
>> card. How big was the
>> FIFO?
>
> The FIFO was 64MByte.
That's huge... and you mentioned a 64k block transfer, much smaller, but still more than 40 times a large Ethernet
packet. It sounds to me like this particular card mfg was focused on very high rate streaming (without gaps or drops)
and not on low-latency, small transfers. I would guess they didn't set up their driver to optimize small transfer
sizes. Maybe even the board didn't support a small size, for example if the FIFO had to contain a minimum number of
channels and/or data length before it could assert "not empty".
-Jeff
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
No comments:
Post a Comment