interconnect: increase UDP unack queue size and fix mem size unit #1520
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Pull request overview
This PR improves the UDP interconnect performance by increasing the maximum queue size and fixing a critical unit conversion bug in memory calculation.
- Doubles MAX_QUEUE_SIZE from 64 to 128 to support larger unacknowledged packet windows
- Fixes memory size calculation by properly converting
gp_interconnect_mem_sizefrom MB to bytes (multiplying by 1024 * 1024)
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leborchuk
reviewed
Jan 5, 2026
…dling Increase MAX_QUEUE_SIZE from 64 to 128 to allow a larger unacknowledged packet window in UDP interconnect, reducing stalls under high-latency or bursty workloads. Fix calculation of per-queue capacity in SetupUDPIFCInterconnect by properly converting gp_interconnect_mem_size from MB to bytes. Without this conversion, the derived send queue depth could be severely underestimated, leading to suboptimal throughput.
leborchuk
approved these changes
Jan 8, 2026
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Increase MAX_QUEUE_SIZE from 64 to 128 to allow a larger unacknowledged packet window in UDP interconnect, reducing stalls under high-latency or bursty workloads.
Fix calculation of per-queue capacity in SetupUDPIFCInterconnect by properly converting gp_interconnect_mem_size from MB to bytes. Without this conversion, the derived send queue depth could be severely underestimated, leading to suboptimal throughput.
Fixes #ISSUE_Number
What does this PR do?
Type of Change
Breaking Changes
Test Plan
make installcheckmake -C src/test installcheck-cbdb-parallelImpact
Performance:
User-facing changes:
Dependencies:
Checklist
Additional Context
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