linux-kernel - Re: [PATCH 1/3] nvme: Add Arbitration Burst support

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Date:   Wed, 24 Jun 2020 10:54:19 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Keith Busch <kbusch@...nel.org>
Cc:     Sagi Grimberg <sagi@...mberg.me>, axboe@...com, hch@....de,
        baolin.wang7@...il.com, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] nvme: Add Arbitration Burst support

On Tue, Jun 23, 2020 at 07:51:35PM -0700, Keith Busch wrote:
> On Wed, Jun 24, 2020 at 09:34:08AM +0800, Baolin Wang wrote:
> > OK, I understaood your concern. Now we will select the RR arbitration as default
> > in nvme_enable_ctrl(), but for some cases, we will not set the arbitration burst
> > values from userspace, and we still want to use the defaut arbitration burst that
> > recommended by the controller, taking into consideration any latency requirements.
> > 
> > So I'd like to add a parameter to decide if we can use the default arbitration
> > burst like below, how do yo think? Thanks.
> 
> I wouldn't call this the 'default' arbitration since it usually is not
> the default. This is the 'recommended' arbitration value.

OK. Change to rename the variable as:
static bool use_recommended_arb;

>  
> > static bool use_default_arb;
> > module_param(use_default_arb, bool, 0444);
> > MODULE_PARM_DESC(use_default_arb, "use default arbitration burst that
> > recommended by the controller");
> 
> "use controller's recommended arbitration burst"

Sure. Thanks.