Re: [Discuss-gnuradio] FFT filter bug in GR3.7.4

[Tom Rondeau]

On Tue, Apr 1, 2014 at 2:21 PM, Marcus D. Leech <address@hidden> wrote:

Tag: v3.7.4git-50-ga8f73d85

This demonstrates a horrible bug I found in FFT filters--change the size from "little" to "quite large", and the scheduler goes running home to momma:


thread[thread-per-block[1]: <block fft_filter_ccc (12)>]: Buffer too small for min_noutput_items


I've attached a minimal GRC to show this.


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

That's actually not surprising. The buffer is established when the top_block is started and will be based on the size of the FFT you need to run. Increasing the size of the filter will not increase the size of the buffer. We'll have to figure out how we want the solution to this to look. Might be we just refuse to increase the filter size during runtime so you'll have to lock/unlock the flowgraph. Will think more on this...

Tom