Thursday, 2019-07-11

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sf-slack2<acomodi> litghost: done, opened a PR upstream with the required changes. https://github.com/verilog-to-routing/vtr-verilog-to-routing/pull/71311:28
tpbTitle: vpr: changed some VPR_THROW to VPR_ERROR by acomodi · Pull Request #713 · verilog-to-routing/vtr-verilog-to-routing · GitHub (at github.com)11:28
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sf-slack2<acomodi> litghost, @tmichalak, mithro: I am confident I have found a great amount of unknown bits. I need to create a minitest to prove it, but I believe that IN_FIFO and OUT_FIFO in the CMT_FIFO column is responsible for those bits17:47
litghostacomodi: Great17:47
sf-slack2<tmichalak> Do we know the base address of this tile?17:49
sf-slack2<tmichalak> Do you mean large number of unknown bits in general or from Litex on Arty perspective?17:51
sf-slack2<acomodi> from the Litex on Arty perspective, but I still need to verify my theories actually17:54
sf-slack2<acomodi> Anyway no, we do not have the base address17:55
sf-slack2<tmichalak> Make sure to create an issue once you are certain18:04
sf-slack2<acomodi> Sure18:08
sf-slack2<butta> We are consistently having an issue where routing gets stuck and isn't able to resolve congestion around FAN_ALT5 resources.  Is this something anyone has insight on or is there something we should try to diagnose this?18:23
sf-slack2<acomodi> @butta try to set the `--congested_routing_iteration_threshold 0.8` vpr option. It sets the router to solve highly congested nets after the number of iterations is above the treshold18:52
sf-slack2<acomodi> if you set your `max iteration number` to 500, with a treshold of 0.8 the highly-congested algorithm should be enabled at iteration 40018:53
sf-slack2<butta> That didn't change anything19:01
sf-slack2<butta> It's still having the same congestion and doesn't seem to be spending a long time trying to resolve the congestion19:02
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litghostbutta: Can you file an issue with the relevant replication information?20:40
mithroI have pushed an updated database + harness20:43
mithroLots of new bits! -> https://github.com/SymbiFlow/prjxray-db/commit/8bb6b84629659db128ee9364e9df121c3c7c341120:44
sf-slack2<butta> @litghost I'm not sure this would be particularly helpful because we have diverged quite a bit from the symbiflow ROI.  These tests route when we allow the placer to choose IO locations, but refuse to route (because of congestion) when we fix the IO locations.21:08
litghostButta: if you help, please create a replicating test case21:09
litghost*If you want help21:09
litghostbutta: Which symbiflow fork are you based off of?21:37
litghostbutta: E.g. last upstream commit21:37
sf-slack2<butta> @litghost 619a4356de8b11b83664826e8e9b78e9154d220b21:38
litghostbutta: Do try https://github.com/SymbiFlow/symbiflow-arch-defs/pull/849 , which improves the lookahead in the router a somewhat21:39
tpbTitle: Add segment and connection box annotations to routing graph. by litghost · Pull Request #849 · SymbiFlow/symbiflow-arch-defs · GitHub (at github.com)21:39
hackerfooThe import scripts have a lot of problems with duplicate site types, so I've decided to work on splitting the IO tiles vertically before proceeding further.23:47
hackerfoohttps://github.com/SymbiFlow/symbiflow-arch-defs/issues/88123:59
tpbTitle: [xc7] add architecture definitions for IO tiles · Issue #881 · SymbiFlow/symbiflow-arch-defs · GitHub (at github.com)23:59

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