Difference between revisions of "EJFAT UDP General Performance Considerations"
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| − | === NIC queues on multi | + | === NIC queues on multi-cpu nodes === |
: [https://www.kernel.org/doc/html/latest/networking/scaling.html Scaling in the Linux Networking Stack] | : [https://www.kernel.org/doc/html/latest/networking/scaling.html Scaling in the Linux Networking Stack] | ||
Revision as of 15:35, 21 December 2023
NIC queues on multi-cpu nodes
- Contemporary NICs support multiple receive and transmit descriptor queues. On reception, a NIC can send different packets to different queues to distribute processing among CPUs. Find out how many NIC queues there are on your node by looking at the combined property:
// See how many queues there are sudo ethtool -l enp193s0f1np1
Effect of NIC queues on UDP transmission
- In the case of ejfat nodes, there are a max of 63 queues even though there are 128 cores. It seems odd to me that there isn't 1 queue per cpu, and it does not appear to be changeable so most likely it's built into the kernel when first created.
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