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[Discuss-gnuradio] b210 overflows and huge usb buffer

From: Juha Vierinen
Subject: [Discuss-gnuradio] b210 overflows and huge usb buffer
Date: Mon, 12 Jan 2015 03:26:52 +0000


Now that the b210 timing issue now solved (thanks to Ian and Balint!), I'm trying to get samples to disk at about 50 MHz. I have more than the required bandwidth on the disk, but there are occasional I/O hiccups. With the N2x0 I just set the recv_buff_size to 1e9 and that solves pretty much all the I/O hangups I get. With the b210 there seems to be a driver imposed limit on the number of receive frames however, which prevent me from increasing num_recv_frames above 2000. At higher values, I get a uhd driver error and no samples come out of the uhd source. How can I increase the usb buffers on the b210 to about 1-2 GB? I don't care about latency, I just want to avoid long gaps in the data that are caused by the disk occasionally hanging up. I have tested the b210 with a null sink and there are no dropped packets.

I've tried everything to reduce disk hangups by changing the filesystem cache settings with some limited help, but I still can't completely remove occasional usb 3.0 packet drops. I'm convinced that simply using a multi gigabyte buffer is the easy way out solution, but I can't make this happen with the current uhd driver. 


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