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high cache and branch misses on libvma #1099

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boranby opened this issue Dec 17, 2024 · 0 comments

boranby commented Dec 17, 2024 •

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Subject

I ran perf record -B -e cache-references,cache-misses,cycles,instructions,branches,branch-misses,faults,migrations -C <core> on both my UDP multicast receiving and TCP recv/send threads.
I see a very high cache and branch misses, attaching their outputs to this issue.

UDP multicast (only recv)

cycles

cache_references

cache_misses

branches

branch_misses

TCP (recv & send)

cycles

cache_references

cache_misses

branches

branch_misses

Issue type

Bug report
Feature request

Configuration:

Product version libvma 9.8.6
OS RHEL 9.5
OFED 24.04-0.7.0
Hardware Mellanox MT2894 Family [ConnectX-6 Lx]

Actual behavior:

I run my app with LD_PRELOAD=libvma.so VMA_SPEC=latency VMA_RX_UDP_POLL_OS_RATIO=0 VMA_SELECT_POLL_OS_RATIO=0 VMA_TCP_QUICKACK=1 configs.

I see very high cache and branch misses on my setup. Pinned 8 cores for UDP multicast listening and pinned 2 cores for two different TCP connections.

Expected behavior:

Low cache and branch misses for better low latency performance.

Steps to reproduce:

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