Merging into master for 0.8 release #99
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A 2D mesh of board routers (one per board) now connects together the 2D NoCs on each board. This means that message can pass over a board without travesing the NoC. The per-board router is not yet programmable, but that is direction we are heading.
Support routing-key-based send operations, but programmable routers don't yet interpret routing keys.
Need to support inflight request info for programmable routers now, in addition to caches. Therefore, generalise the info field in a DRAMResp. Need to check that the optimiser does what I expect in this case, i.e. throws away unused bits in the info field.
(But doesn't compile yet)
(Compiles but untested)
(Works, but only tests one type of routing record so far)
These work. Still need to test RR records, and multi-beat records.
Working fine but needed to clarify the docs: the size field in a beat is the number of records, not the number of chunks.
(From 0.6.3)
(From 0.6.3)
This is to distinguish (existing) thread-level routing tables from board-level routing tables (to come).
(Builds but untested)
(Compiles, but untested)
The 'active' condition in the fetcher was inverted, and also referred to the wrong state variable.
Missing 'return' statement, and missing use of 'offset' when uploading routing tables. The POLite heat grid now appears to work in simulation. Ready to try things on FPGA.
Fast mapping version of POLite
I was trying to save area in the ProgRouter crossbar by sharing output queues between inter and intra FPGA links, but this introduces deadlock. Every trick I've tried to reduce area in the ProgRouter has met the same fate. So here's the fully parallel that's working very nicely so far, if a bit greedy in terms of FPGA area.
Optional extra send slot
POLite now allows empty pins, so fan outs of some vertices may be zero
Multiple boxes in the Y direction only has stopped working. Looking back at the first commit the in 0.8 branch, it looks like I accidently changed the behviour of inter-board routing by considering the host bit before knowing that we're on the correct Y coordinate. Hopefully, this is the fix...
Fix multi box issue
If POLITE_DUMP_STATS is defined then measuring time from the host isn't very accurate because it will include the time to transfer a large number of stats over the slow UART. To help users become aware of this, we now don't display the time if POLITE_DUMP_STATS is enabled.
This is faster than METIS and gives similar results for a few graphs that I've tried. It works by picking an unvisited vertex, and then doing a size-bounded BFS from that vertex with the size-bound equal to the partition size. This process is repeated until the partition is full, at which point we move to a new parition and repeat the process until all vertices have been visited. It is just a few lines of code, and could be easily parallelised in future.
Compiles but untested...
coralmw
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Apr 26, 2022
Merging into master for 0.8 release
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