linux-kernel - Re: [RFC][Patch v1 2/3] i40e: limit msix vectors based on housekeeping CPUs

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Message-ID: <20200922204400.GC5217@lenoir>
Date:   Tue, 22 Sep 2020 22:44:01 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Nitesh Narayan Lal <nitesh@...hat.com>
Cc:     bhelgaas@...gle.com, Jesse Brandeburg <jesse.brandeburg@...el.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-pci@...r.kernel.org, mtosatti@...hat.com,
        sassmann@...hat.com, jeffrey.t.kirsher@...el.com,
        jacob.e.keller@...el.com, jlelli@...hat.com, hch@...radead.org,
        mike.marciniszyn@...el.com, dennis.dalessandro@...el.com,
        thomas.lendacky@....com, jerinj@...vell.com,
        mathias.nyman@...el.com, jiri@...dia.com
Subject: Re: [RFC][Patch v1 2/3] i40e: limit msix vectors based on
 housekeeping CPUs

On Tue, Sep 22, 2020 at 09:34:02AM -0400, Nitesh Narayan Lal wrote:
> On 9/22/20 5:54 AM, Frederic Weisbecker wrote:
> > But I don't also want to push toward a complicated solution to handle CPU hotplug
> > if there is no actual problem to solve there.
> 
> Sure, even I am not particularly sure about the hotplug scenarios.

Surely when isolation is something that will be configurable through
cpuset, it will become interesting. For now it's probably not worth
adding hundreds lines of code if nobody steps into such issue yet.

What is probably more worthy for now is some piece of code to consolidate
the allocation of those MSI vectors on top of the number of housekeeping
CPUs.

Thanks.