Poor performance on 10g network

Davvo

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Jul 12, 2022
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When Receive Side Scaling (RSS) is enabled, all of the receive data processing for a particular TCP connection is shared across multiple processors or processor cores. Without RSS, all of the processing is performed by a single processor, resulting in inefficient system cache utilization.
Looks like your issue was the CPU.
 

egghog

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Sep 17, 2022
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Looks like your issue was the CPU.
That's odd, because it sounds like enabling RSS would improve performance. But in my case, disabling it improved it.

Another weird thing happened! I disabled interrupt moderation on the NIC in Windows, and the read speed increased to over 800MB/s. However, write speed dropped back down to 250MB/s.
I imagine I’d have to do something on the NAS side to correct this. Is interrupt moderation recommended?
 

Davvo

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