linux-kernel - Re: [PATCH 3/3] nvme: Enable autonomous power state transitions

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Message-ID: <CALCETrWDRV_TZRpsya=kmG+zDGwRqBpSGh6NGqCgDw3SdMfT9w@mail.gmail.com>
Date:   Mon, 29 Aug 2016 16:16:33 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Christoph Hellwig <hch@....de>, linux-nvme@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...com>
Subject: Re: [PATCH 3/3] nvme: Enable autonomous power state transitions

On Aug 29, 2016 9:35 AM, "Keith Busch" <keith.busch@...el.com> wrote:
>
> On Mon, Aug 29, 2016 at 02:25:46AM -0700, Andy Lutomirski wrote:
> > +     /*
> > +      * By default, allow up to 25ms of APST-induced latency.  This will
> > +      * have no effect on non-APST supporting controllers (i.e. any
> > +      * controller with APSTA == 0).
> > +      */
> > +     ctrl->apst_max_latency_ns = 25000000;
>
> Any objection to making this a module parameter? 25ms default sounds
> reasonable, but I would still like the option to not ever initialize
> APST on a capable device.

Will do.