hardNVIDIAGoldman SachsCloudflare

A 25Gbps NIC tops out near 4Gbps while one core sits pinned in softirq. What is happening and how do you fix it?

One CPU doing all the packet work is a topology failure, not a tuning mystery. RSS queues, MSI-X vectors, local_cpulist and irqbalance: the whole chain from symptom to pin.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

One CPU doing all the packet work is a topology failure, not a tuning mystery. RSS queues, MSI-X vectors, local_cpulist and irqbalance: the whole chain from symptom to pin.

28 answers per topic instead of 18, and your progress kept · no cardor unlock all 401 remaining answers · ₹2,000 / $25

UP NEXT ON YOUR JOURNEY

Next in this trackDNS Record Types and Their Gotchas Next in this trackKernel Upgrades Across a Fleet Next in this trackThroughput Testing with iperf3

NOTES & DISCUSSION · 0

Nothing here yet. Say how you would answer it.