netdev - Re: [PATCH V2 net-next] net: mana: Assigning IRQ affinity on HT cores

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Date: Tue, 21 Nov 2023 15:48:41 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>
Cc: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
 decui@...rosoft.com, davem@...emloft.net, edumazet@...gle.com,
 pabeni@...hat.com, longli@...rosoft.com, sharmaajay@...rosoft.com,
 leon@...nel.org, cai.huoqing@...ux.dev, ssengar@...ux.microsoft.com,
 vkuznets@...hat.com, tglx@...utronix.de, linux-hyperv@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-rdma@...r.kernel.org, schakrabarti@...rosoft.com,
 paulros@...rosoft.com
Subject: Re: [PATCH V2 net-next] net: mana: Assigning IRQ affinity on HT
 cores

On Tue, 21 Nov 2023 05:54:37 -0800 Souradeep Chakrabarti wrote:
> Existing MANA design assigns IRQ to every CPUs, including sibling hyper-threads
> in a core. This causes multiple IRQs to work on same CPU and may reduce the network
> performance with RSS.
> 
> Improve the performance by adhering the configuration for RSS, which assigns IRQ
> on HT cores.

Drivers should not have to carry 120 LoC for something as basic as
spreading IRQs. Please take a look at include/linux/topology.h and
if there's nothing that fits your needs there - add it. That way
other drivers can reuse it.