> -----Original Message----- > From: Brian Padalino [mailto:[EMAIL PROTECTED] > Sent: Sunday, September 07, 2008 7:21 AM > > Were these results for the 2 channel mode? > > What is the size difference within the USRP when using 2 channels? Is > it significant or pretty insignificant?
They were from the 1 channel build. Here is a snippet from inband_2rxhb_2tx.rbf: ch: 0 s: 965745 delta: 8064 ch: 1 s: 965745 delta: 8064 ch: 0 s: 973809 delta: 8064 ch: 1 s: 973809 delta: 8064 ch: 0 s: 981873 delta: 8064 ch: 1 s: 981873 delta: 8064 ch: 0 s: 989937 delta: 8064 ch: 1 s: 989937 delta: 8064 ch: 0 s: 998001 delta: 8064 ch: 1 s: 998001 delta: 8064 The channels seem well aligned at least. Unfortunately, I am getting regular segfaults on 2rx... :-/ Resource Comparison: New 2 chan: ; Compilation Hierarchy Node ; Logic Cells ; LC Registers ; Memory Bits ; M4Ks ; |rx_buffer_inband:rx_buffer| ; 983 (59) ; 697 ; 72576 ; 18 ; |packet_builder:pb| ; 162 (162) ; 19 ; 0 ; 0 ; |rx_channel_buffer:cb[0].chan_buf[0]| ; 249 (68) ; 209 ; 24192 ; 6 Orig 2 chan: ; Compilation Hierarchy Node ; Logic Cells ; LC Registers ; Memory Bits ; M4Ks ; |rx_buffer_inband:rx_buffer| ; 546 (119) ; 318 ; 114688 ; 28 ; |packet_builder:rx_pkt_builer| ; 137 (137) ; 41 ; 0 ; 0 ; |fifo_1kx16:generate_channel_fifos[0].rx_chan_fifo| ; 43 (0) ; 33 ; 16384 ; 4 ; |fifo_4kx16_dc:rx_usb_fifo| ; 158 (0) ; 134 ; 65536 ; 16 I haven't done any optimization yet, so I'm not sure how much the logic cell utilization could be reduced. I imagine a fair amount of it comes from my use of 64 bit wide data paths for header data. I may try a hybrid version where the header data is muxed into a 16b header fifo. There shouldn't be any performance penalty except for very short packets (< 64 bytes, e.g. command channel). The header fifo capacity would be better utilized then as well. The new code has 4+2 M4Ks (vs just 4) per channel, but with no usb_fifo (+16 M4K), so memory comparison is not really apples to apples. We could split the usb_fifo memory between the channels and give each 2-4k per channel. --ets _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
