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

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Message-ID: <20240308112244.391b3779@kernel.org>
Date: Fri, 8 Mar 2024 11:22:44 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Haiyang Zhang <haiyangz@...rosoft.com>
Cc: 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>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>, KY Srinivasan
 <kys@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Dexuan Cui
 <decui@...rosoft.com>, Long Li <longli@...rosoft.com>, Michael Kelley
 <mikelley@...rosoft.com>
Subject: Re: [PATCH] net :mana : Add per-cpu stats for MANA device

On Fri, 8 Mar 2024 18:51:58 +0000 Haiyang Zhang wrote:
> > Dynamic is a bit of an exaggeration, right? On a well-configured system
> > each CPU should use a single queue assigned thru XPS. And for manual
> > debug bpftrace should serve the purpose quite well.  
> 
> Some programs, like irqbalancer can dynamically change the CPU affinity, 
> so we want to add the per-CPU counters for better understanding of the CPU 
> usage.

Do you have experimental data showing this making a difference
in production?

Seems unlikely, but if it does work we should enable it for all
devices, no driver by driver.