From: "Singh, Balbir" <sblbir@amazon.com>
To: "hch@lst.de" <hch@lst.de>
Cc: "kbusch@kernel.org" <kbusch@kernel.org>,
"axboe@fb.com" <axboe@fb.com>,
"sblbir@amzn.com" <sblbir@amzn.com>,
"sagi@grimberg.me" <sagi@grimberg.me>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>
Subject: Re: [PATCH v2 2/2] nvme/host/core: Allow overriding of wait_ready timeout
Date: Mon, 16 Sep 2019 21:04:31 +0000 [thread overview]
Message-ID: <b9eb8038c04e3ae87d4f55ea228f8d12ef1ed42a.camel@amazon.com> (raw)
In-Reply-To: <20190916160117.GB1455@lst.de>
On Mon, 2019-09-16 at 18:01 +0200, hch@lst.de wrote:
> On Mon, Sep 16, 2019 at 12:33:31PM +0000, Singh, Balbir wrote:
> > > Then again I'm not even sure we really want this. The debugging use
> > > case is somethign where you can easily hack a line in the driver, and
> > > we really don't want normal users to mess with a random parameter
> > > like
> > > this one.
> >
> > The reason I sent this out is that I've seen some controllers setting
> > this to max value. I suspect there is no good way for the controller
> > to set wait ready values either. In any case 128 seconds for a failure
> > seems a bit too much, specially if the controller does not respond on
> > boot and hence the debug option. I don't expect it to be used by normal
> > users on most of their systems
>
> The problem with these tweaks is that people will touch them for
> weird reasons. Another one is that a module parameter is global,
> while many settings should be per-controller (although that would
> add even more boilerplate code).
I do understand the concerns, may be a sysfs file would be better for
per controller tweaks, but that means it is hard to apply on boot.
I wonder if I should just call it debug_wait_ready_timeout and in the
comments about the help/description call out that this is a debug
feature.
What do you suggest?
Cheers,
Balbir Singh.
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next prev parent reply other threads:[~2019-09-16 21:05 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-13 23:36 [PATCH v2 1/2] nvme/host/pci: Fix a race in controller removal Balbir Singh
2019-09-13 23:36 ` [PATCH v2 2/2] nvme/host/core: Allow overriding of wait_ready timeout Balbir Singh
2019-09-16 7:41 ` Christoph Hellwig
2019-09-16 12:33 ` Singh, Balbir
2019-09-16 16:01 ` hch
2019-09-16 21:04 ` Singh, Balbir [this message]
2019-09-17 1:14 ` Keith Busch
2019-09-17 2:56 ` Singh, Balbir
2019-09-17 3:17 ` Bart Van Assche
2019-09-17 5:02 ` Singh, Balbir
2019-09-17 17:21 ` James Smart
2019-09-17 20:08 ` James Smart
2019-09-17 3:54 ` Keith Busch
2019-09-16 7:49 ` [PATCH v2 1/2] nvme/host/pci: Fix a race in controller removal Christoph Hellwig
2019-09-16 12:07 ` Singh, Balbir
2019-09-16 15:40 ` Bart Van Assche
2019-09-16 19:38 ` Singh, Balbir
2019-09-16 19:56 ` Bart Van Assche
2019-09-16 20:40 ` Singh, Balbir
2019-09-17 17:55 ` Bart Van Assche
2019-09-17 20:30 ` Keith Busch
2019-09-17 20:44 ` Singh, Balbir
2019-09-16 20:07 ` Keith Busch
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