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| pepijndevos | uh... nextpnr claims to use 100% CPU but my fans are idle and routing is making close to zero progress | 08:59 |
|---|---|---|
| pepijndevos | It's taking 2 minutes per batch | 08:59 |
| daveshah | try running with --debug --verbose to see what it is stuck on | 09:03 |
| pepijndevos | and abort 3467 seconds of progress? XD okay let's see | 09:04 |
| daveshah | are your delays messed up by any chance? | 09:05 |
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| daveshah | either that or unresolveably conflicting signals are usually the cause of weird router behaviour | 09:05 |
| pepijndevos | uh, this is Apicula, so delays could be... interesting | 09:06 |
| daveshah | as we've discussed before, they don't need to be accurate | 09:06 |
| daveshah | they just need to be consistent with your delay estimate | 09:06 |
| tnt | Mmm, I usually cherry pick " ice40: Pack LUT and carry in more cases" and "ice40: Use correct delays for LUT-permutation pips" from your branches, I'm wondering if that could explain why some seed yield router ending in a infinite loop. | 09:06 |
| pepijndevos | yea I think we changed them and that seemed to resolve the problem back then | 09:06 |
| pepijndevos | But this design uses a significant part of the FPGA, so without clock routing it could be that it just struggles a lot with timing | 09:07 |
| pepijndevos | running... | 09:10 |
| pepijndevos | I have no idea what I'm looking at. How much of this output do you want? | 09:13 |
| pepijndevos | It seems to be doing a fair amount of unbinding | 09:14 |
| daveshah | About 20-30 nets worth of output should be enough to get a rough idea | 09:16 |
| pepijndevos | https://bpa.st/GXXA | 09:17 |
| tpb | Title: View paste GXXA (at bpa.st) | 09:17 |
| daveshah | Can't see anything too obviously wrong | 09:18 |
| daveshah | The visited node count is quite high so I suspect it is just the delay estimate needs tuning | 09:18 |
| daveshah | probably increasing | 09:18 |
| pepijndevos | ctx.setDelayScaling(0.05, 0.5) this one right? | 09:19 |
| daveshah | Yeah | 09:19 |
| pepijndevos | pick a number haha | 09:19 |
| daveshah | Try doubling both to start with | 09:19 |
| pepijndevos | woooo that's going so much faster | 09:20 |
| pepijndevos | before it was showing 100ms+ pauses in the output, now it's racing by faster than I can read | 09:21 |
| pepijndevos | I think the number of visited nodes is much lower indeed now | 09:21 |
| pepijndevos | some output: https://bpa.st/76OQ I'll run it without debug now to see if it finishes | 09:23 |
| tpb | Title: View paste 76OQ (at bpa.st) | 09:23 |
| daveshah | If the estimate is now too high (I suspect the second number in particular might be) it will go much faster but also take more iterations | 09:23 |
| pepijndevos | I see... I'll try tweaking it a bit more | 09:23 |
| daveshah | This is a picorv32 demo? | 09:23 |
| pepijndevos | yea | 09:24 |
| daveshah | do you have any RAM primitives yet? | 09:24 |
| pepijndevos | no haha | 09:24 |
| daveshah | for some reason I've found bitblasted RAMs tend to be quite slow to route | 09:24 |
| pepijndevos | so it's taking up most of the 9k luts with registers | 09:24 |
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| pepijndevos | it's actually only marginally worse in terms of itterations than before. I recall at 31000 it was at 8k unrouted before, while now it's at 9k | 09:29 |
| pepijndevos | yay, I'm counting primes ;) | 09:46 |
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