linux-kernel - Re: RE: [PATCH] net :mana : Add per-cpu stats for MANA device

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Message-ID: <20240308203328.IvakSEHd@linutronix.de>
Date: Fri, 8 Mar 2024 21:33:28 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Haiyang Zhang <haiyangz@...rosoft.com>
Cc: Jakub Kicinski <kuba@...nel.org>,
	Shradha Gupta <shradhagupta@...ux.microsoft.com>,
	Shradha Gupta <shradhagupta@...rosoft.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Ajay Sharma <sharmaajay@...rosoft.com>,
	Leon Romanovsky <leon@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	KY Srinivasan <kys@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
	Dexuan Cui <decui@...rosoft.com>, Long Li <longli@...rosoft.com>,
	Paul Rosswurm <paulros@...rosoft.com>,
	Alireza Dabagh <alid@...rosoft.com>,
	Sharath George John <sgeorgejohn@...rosoft.com>
Subject: Re: RE: [PATCH] net :mana : Add per-cpu stats for MANA device

On 2024-03-08 19:43:57 [+0000], Haiyang Zhang wrote:
> > Do you have experimental data showing this making a difference
> > in production?
> Shradha, could you please add some data before / after enabling irqbalancer 
> which changes cpu affinity?

so you have one queue and one interrupt and then the irqbalancer is
pushing the interrupt from CPU to another. What kind of information do
you gain from per-CPU counters here?

> Thanks,
> - Haiyang

Sebastian