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SubjectRe: [PATCH 4/4 V2 net-next] net: mana: Assigning IRQ affinity on HT cores
On Mon, Jan 22, 2024 at 08:00:59AM -0800, Souradeep Chakrabarti wrote:
> Existing MANA design assigns IRQ to every CPU, including sibling
> hyper-threads. This may cause multiple IRQs to be active simultaneously
> in the same core and may reduce the network performance.
>
> Improve the performance by assigning IRQ to non sibling CPUs in local
> NUMA node. The performance improvement we are getting using ntttcp with
> following patch is around 15 percent against existing design and
> approximately 11 percent, when trying to assign one IRQ in each core
> across NUMA nodes, if enough cores are present.
> The change will improve the performance for the system
> with high number of CPU, where number of CPUs in a node is more than
> 64 CPUs. Nodes with 64 CPUs or less than 64 CPUs will not be affected
> by this change.
>
> The performance study was done using ntttcp tool in Azure.
> The node had 2 nodes with 32 cores each, total 128 vCPU and number of channels
> were 32 for 32 RX rings.
>
> The below table shows a comparison between existing design and new
> design:
>
> IRQ node-num core-num CPU performance(%)
> 1 0 | 0 0 | 0 0 | 0-1 0
> 2 0 | 0 0 | 1 1 | 2-3 3
> 3 0 | 0 1 | 2 2 | 4-5 10
> 4 0 | 0 1 | 3 3 | 6-7 15
> 5 0 | 0 2 | 4 4 | 8-9 15
> ---
> ---
> 25 0 | 0 12| 24 24| 48-49 12
> ---
> 32 0 | 0 15| 31 31| 62-63 12
> 33 0 | 0 16| 0 32| 0-1 10
> ---
> 64 0 | 0 31| 31 63| 62-63 0

Did that omitted lines mean 5-24 : 15%, 25-31 : 12% and 33-63 : 10%?
Or that means that you didn't test those?

Would be nice to have full coverage...

Thanks,
Yury

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