Re: [Question] ixgbe：Mechanism of RSS

[Haifeng Xu]

On 2025/1/9 05:06, Tony Nguyen wrote:
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> On 1/7/2025 7:36 PM, Haifeng Xu wrote:
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>> On 2025/1/8 01:16, Tony Nguyen wrote:
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> ...
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>>> What's your ntuple filter setting? If it's off, I suspect it may be the Flow Director ATR (Application Targeting Routing) feature which will utilize all queues. I believe if you turn on ntuple filters this will turn that feature off.
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>> Yes, our ntuple filter setting is off. After turning on the ntuple filters, I compare the delta of recieved packets,
>> only 0~15 rx rings are non-zero, other rx rings are zero.
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>> If we want to spread the packets across 0~62, how can we tune the NIC setting?
>> we have enabled 63 rx queues, irq_affinity and rx-flow-hash, but the 0~15 cpu
>> received more packets than others.
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> As Jakub mentioned earlier, HW RSS is only supported on this device for 16 queues. ATR will steer bi-directional traffic to utilize additional queues, however, once its exhausted it will fallback to RSS, which is why CPUs 0-15 are receiving more traffic than the others. I'm not aware of a way to evenly spread the traffic beyond the 16 HW supported RSS queues for this device.

Ok, thanks!

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> Thanks,
> Tony
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>> Thanks!
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>