ADR-0023 D9: blocking credit-emit with full-path latency
PE_IPCQ._handle_recv now yields-from _delayed_credit_send instead of spawning it as a fork, so the receiver's pe_exec_ns includes the credit-return cost. _credit_latency_ns switches from compute_drain_ns(path, 16) to compute_path_latency_ns(path, 16) and fixes a latent find_path bug where the destination lacked the ".pe_dma" suffix (silently returned 0 ns under the bare except). Net effect on h3/h4 inter-cube pe-to-pe latency: IPCQ >= raw DMA at every size, matching real-HW posted-write semantics. tl.send remains fire-and-forget. ADR-0023 D9 amended; new diagnostic test tests/test_pe_to_pe_diagnostic.py captures per-PE pe_exec_ns, paths, drain, and meta-arrival timing. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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hop,label,size_bytes,path,total_ns
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),128,ipcq,31.1399999999976
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),128,raw,12.019999999996799
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),256,ipcq,32.6399999999976
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),256,raw,13.019999999996799
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),384,ipcq,34.1399999999976
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),384,raw,14.019999999996799
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),512,ipcq,35.6399999999976
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),512,raw,15.019999999996799
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),768,ipcq,38.6399999999976
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),768,raw,17.0199999999968
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),1024,ipcq,41.6399999999976
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),1024,raw,19.0199999999968
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),2048,ipcq,53.6399999999976
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),2048,raw,27.0199999999968
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),4096,ipcq,77.6399999999976
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),4096,raw,43.0199999999968
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),8192,ipcq,125.64000000000306
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),8192,raw,75.02000000000407
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),10240,ipcq,149.64000000000306
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h1_intra_horizontal,Intra-cube horizontal (pe0 to pe1),10240,raw,91.02000000000407
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),128,ipcq,31.1399999999976
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),128,raw,12.019999999996799
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),256,ipcq,32.6399999999976
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),256,raw,13.019999999996799
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),384,ipcq,34.1399999999976
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),384,raw,14.019999999996799
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),512,ipcq,35.6399999999976
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),512,raw,15.019999999996799
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),768,ipcq,38.6399999999976
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),768,raw,17.0199999999968
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),1024,ipcq,41.6399999999976
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),1024,raw,19.0199999999968
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),2048,ipcq,53.6399999999976
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),2048,raw,27.0199999999968
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),4096,ipcq,77.6399999999976
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),4096,raw,43.0199999999968
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),8192,ipcq,125.64000000000306
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),8192,raw,75.02000000000407
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),10240,ipcq,149.64000000000306
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h2_intra_vertical,Intra-cube vertical (pe0 to pe4),10240,raw,91.02000000000407
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),128,ipcq,67.15999999999804
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),128,raw,68.53999999999724
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),256,ipcq,68.65999999999804
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),256,raw,70.03999999999724
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),384,ipcq,70.15999999999804
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),384,raw,71.53999999999724
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),512,ipcq,71.65999999999804
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),512,raw,73.03999999999724
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),768,ipcq,74.65999999999804
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),768,raw,76.03999999999724
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),1024,ipcq,77.65999999999804
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),1024,raw,79.03999999999724
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),2048,ipcq,89.65999999999804
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),2048,raw,91.03999999999724
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),4096,ipcq,113.65999999999804
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),4096,raw,115.03999999999724
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),8192,ipcq,161.65999999999985
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),8192,raw,163.04000000000087
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),10240,ipcq,185.65999999999985
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h3_inter_cube_horizontal,Inter-cube horizontal (cube0 to cube1),10240,raw,187.04000000000087
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),128,ipcq,87.15999999999804
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),128,raw,88.53999999999724
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),256,ipcq,88.65999999999804
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),256,raw,90.03999999999724
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),384,ipcq,90.15999999999804
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),384,raw,91.53999999999724
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),512,ipcq,91.65999999999804
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),512,raw,93.03999999999724
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),768,ipcq,94.65999999999804
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),768,raw,96.03999999999724
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),1024,ipcq,97.65999999999804
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),1024,raw,99.03999999999724
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),2048,ipcq,109.65999999999804
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),2048,raw,111.03999999999724
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),4096,ipcq,133.65999999999804
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),4096,raw,135.03999999999724
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),8192,ipcq,181.65999999999985
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),8192,raw,183.04000000000087
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),10240,ipcq,205.65999999999985
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h4_inter_cube_vertical,Inter-cube vertical (cube0 to cube4),10240,raw,207.04000000000087
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",128,ipcq,6.015000000003056
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",256,ipcq,6.515000000003056
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",384,ipcq,7.015000000003056
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",512,ipcq,7.515000000003056
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",768,ipcq,8.515000000003056
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",1024,ipcq,9.515000000003056
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",2048,ipcq,13.515000000003056
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",4096,ipcq,21.515000000003056
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",8192,ipcq,37.51499999999214
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h5_inter_sip,"Inter-SIP (sip0 to sip1, same cube/pe)",10240,ipcq,45.51499999999214
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